TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Čekada, Miha
AU  - Jagličić, Zvonko
AU  - Pregelj, Matej
AU  - Spreitzer, Matjaž
AU  - Panjan, Peter
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12839
AB  - In the literature, a magnetic “easy” axis perpendicular to the film plane at room temperature (i.e., perpendicular magnetic anisotropy - PMA) has been reported in Ni (nickel) layers with thicknesses below ≈15 nm. In this work, we observed room-temperature PMA in a-Si/Ni/a-Si (where a-Si denotes amorphous silicon) thin film structures with nickel layer thicker than 15 nm. Two layered structures were prepared by DC/RF triode sputtering: [a-Si/Ni/a-Si] sandwich structure and [a-Si/Ni/a-Si]5 multilayer structure. The cross sectional STEM revealed uniform Ni layers with thicknesses of ≈17 nm in [a-Si/Ni/a-Si]5 – multilayer and ≈28 nm in [a-Si/Ni/a-Si] – single-layer whereas amorphous Si layers were ≈15 nm and 170 nm thick, respectively. An amorphous Ni–Si interphase was also observed in the layered structures. The XRD showed patterns for fcc-Ni with dominant (111) orientation. No other crystalline phases were observed in the XRD patterns. To our knowledge, there are no literature reports of easy magnetization direction perpendicular to the film plane at room temperature for Ni layers with thickness of ≈28 nm as presented in this work. The origin of PMA in a-Si/Ni/a-Si films may be mainly attributed to the magnetoelastic anisotropy whereas the secondary source of PMA is believed to be the surface anisotropy and magnetocrystalline anisotropy of [111] columnar grains. Amorphous silicon layers (substrate) do not have a well-defined lattice structure like crystalline substrates. Therefore, they do not induce strains in the nickel layers through lattice mismatch as in the case of epitaxy. The strains can be caused by other factors such as diffusion-induced strain, thermal expansion mismatch or intrinsic stresses during the growth process. These results could be important for applications in memory devices, sensors, logic chips, magneto-optic, magneto-electronic and spintronic devices and in fundamental research, as well as first step toward preparation and understanding of the PMA in thick nickel layers.
T2  - Ceramics International
T1  - Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers
VL  - 49
IS  - 19
SP  - 32068
EP  - 32077
DO  - 10.1016/j.ceramint.2023.07.174
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Čekada, Miha and Jagličić, Zvonko and Pregelj, Matej and Spreitzer, Matjaž and Panjan, Peter",
year = "2023",
abstract = "In the literature, a magnetic “easy” axis perpendicular to the film plane at room temperature (i.e., perpendicular magnetic anisotropy - PMA) has been reported in Ni (nickel) layers with thicknesses below ≈15 nm. In this work, we observed room-temperature PMA in a-Si/Ni/a-Si (where a-Si denotes amorphous silicon) thin film structures with nickel layer thicker than 15 nm. Two layered structures were prepared by DC/RF triode sputtering: [a-Si/Ni/a-Si] sandwich structure and [a-Si/Ni/a-Si]5 multilayer structure. The cross sectional STEM revealed uniform Ni layers with thicknesses of ≈17 nm in [a-Si/Ni/a-Si]5 – multilayer and ≈28 nm in [a-Si/Ni/a-Si] – single-layer whereas amorphous Si layers were ≈15 nm and 170 nm thick, respectively. An amorphous Ni–Si interphase was also observed in the layered structures. The XRD showed patterns for fcc-Ni with dominant (111) orientation. No other crystalline phases were observed in the XRD patterns. To our knowledge, there are no literature reports of easy magnetization direction perpendicular to the film plane at room temperature for Ni layers with thickness of ≈28 nm as presented in this work. The origin of PMA in a-Si/Ni/a-Si films may be mainly attributed to the magnetoelastic anisotropy whereas the secondary source of PMA is believed to be the surface anisotropy and magnetocrystalline anisotropy of [111] columnar grains. Amorphous silicon layers (substrate) do not have a well-defined lattice structure like crystalline substrates. Therefore, they do not induce strains in the nickel layers through lattice mismatch as in the case of epitaxy. The strains can be caused by other factors such as diffusion-induced strain, thermal expansion mismatch or intrinsic stresses during the growth process. These results could be important for applications in memory devices, sensors, logic chips, magneto-optic, magneto-electronic and spintronic devices and in fundamental research, as well as first step toward preparation and understanding of the PMA in thick nickel layers.",
journal = "Ceramics International",
title = "Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers",
volume = "49",
number = "19",
pages = "32068-32077",
doi = "10.1016/j.ceramint.2023.07.174"
}

Tadić, M., Panjan, M., Čekada, M., Jagličić, Z., Pregelj, M., Spreitzer, M.,& Panjan, P.. (2023). Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers. in Ceramics International, 49(19), 32068-32077.
https://doi.org/10.1016/j.ceramint.2023.07.174

Tadić M, Panjan M, Čekada M, Jagličić Z, Pregelj M, Spreitzer M, Panjan P. Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers. in Ceramics International. 2023;49(19):32068-32077.
doi:10.1016/j.ceramint.2023.07.174 .

Tadić, Marin, Panjan, Matjaž, Čekada, Miha, Jagličić, Zvonko, Pregelj, Matej, Spreitzer, Matjaž, Panjan, Peter, "Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers" in Ceramics International, 49, no. 19 (2023):32068-32077,
https://doi.org/10.1016/j.ceramint.2023.07.174 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Lalatone, Yoann
AU  - Milošević, Irena
AU  - Vučetić Tadić, Biljana
AU  - Lazović, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10477
AB  - We investigate synthesis, phase evolution, hollow and porous structure and magnetic properties of quasi-amorphous intermediate phase (QUAIPH) and hematite (α-Fe2O3) nanostructure synthesized by annealing of akaganeite (β-FeOOH) nanorods. It is found that the annealing temperature determines the phase composition of the products, the crystal structure/size dictates the magnetic properties whereas the final nanorod morphology is determined by the starting material. Annealing of β-FeOOH at ∼300 °C resulted in the formation of hollow QUAIPH nanorods. The synthesized material shows low-cytotoxicity, superparamagnetism and good transverse relaxivity, which is rarely reported for QUAIPH. The QUAIPH nanorods started to transform to porous hematite nanostructures at ∼350 °C and phase transformation was completed at 600 °C. During the annealing, the crystal structure changed from monoclinic (akaganeite) to quasi-amorphous and rhombohedral (hematite). Unusually, the crystallite size first decreased (akaganeite → QUAIPH) and then increased (QUAIPH → hematite) during annealing whereas the nanorods retained particle shape. The magnetic properties of the samples changed from antiferromagnetic (akaganeite) to superparamagnetic with blocking temperature TB = 84 K (QUAIPH) and finally to weak-ferromagnetic with the Morin transition at TM = 244 K and high coercivity HC = 1652 Oe (hematite). The low-cytotoxicity and MRI relaxivity (r2 = 5.80 mM−1 s−1 (akaganeite), r2 = 4.31 mM−1 s−1 (QUAIPH) and r2 = 5.17 mM−1 s−1 (hematite)) reveal potential for biomedical applications.
T2  - Advanced Powder Technology
T1  - Magnetic properties, phase evolution, hollow structure and biomedical application of hematite (α-Fe2O3) and QUAIPH
VL  - 33
IS  - 12
SP  - 103847
DO  - 10.1016/j.apt.2022.103847
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Lalatone, Yoann and Milošević, Irena and Vučetić Tadić, Biljana and Lazović, Jelena",
year = "2022",
abstract = "We investigate synthesis, phase evolution, hollow and porous structure and magnetic properties of quasi-amorphous intermediate phase (QUAIPH) and hematite (α-Fe2O3) nanostructure synthesized by annealing of akaganeite (β-FeOOH) nanorods. It is found that the annealing temperature determines the phase composition of the products, the crystal structure/size dictates the magnetic properties whereas the final nanorod morphology is determined by the starting material. Annealing of β-FeOOH at ∼300 °C resulted in the formation of hollow QUAIPH nanorods. The synthesized material shows low-cytotoxicity, superparamagnetism and good transverse relaxivity, which is rarely reported for QUAIPH. The QUAIPH nanorods started to transform to porous hematite nanostructures at ∼350 °C and phase transformation was completed at 600 °C. During the annealing, the crystal structure changed from monoclinic (akaganeite) to quasi-amorphous and rhombohedral (hematite). Unusually, the crystallite size first decreased (akaganeite → QUAIPH) and then increased (QUAIPH → hematite) during annealing whereas the nanorods retained particle shape. The magnetic properties of the samples changed from antiferromagnetic (akaganeite) to superparamagnetic with blocking temperature TB = 84 K (QUAIPH) and finally to weak-ferromagnetic with the Morin transition at TM = 244 K and high coercivity HC = 1652 Oe (hematite). The low-cytotoxicity and MRI relaxivity (r2 = 5.80 mM−1 s−1 (akaganeite), r2 = 4.31 mM−1 s−1 (QUAIPH) and r2 = 5.17 mM−1 s−1 (hematite)) reveal potential for biomedical applications.",
journal = "Advanced Powder Technology",
title = "Magnetic properties, phase evolution, hollow structure and biomedical application of hematite (α-Fe2O3) and QUAIPH",
volume = "33",
number = "12",
pages = "103847",
doi = "10.1016/j.apt.2022.103847"
}

Tadić, M., Panjan, M., Lalatone, Y., Milošević, I., Vučetić Tadić, B.,& Lazović, J.. (2022). Magnetic properties, phase evolution, hollow structure and biomedical application of hematite (α-Fe2O3) and QUAIPH. in Advanced Powder Technology, 33(12), 103847.
https://doi.org/10.1016/j.apt.2022.103847

Tadić M, Panjan M, Lalatone Y, Milošević I, Vučetić Tadić B, Lazović J. Magnetic properties, phase evolution, hollow structure and biomedical application of hematite (α-Fe2O3) and QUAIPH. in Advanced Powder Technology. 2022;33(12):103847.
doi:10.1016/j.apt.2022.103847 .

Tadić, Marin, Panjan, Matjaž, Lalatone, Yoann, Milošević, Irena, Vučetić Tadić, Biljana, Lazović, Jelena, "Magnetic properties, phase evolution, hollow structure and biomedical application of hematite (α-Fe2O3) and QUAIPH" in Advanced Powder Technology, 33, no. 12 (2022):103847,
https://doi.org/10.1016/j.apt.2022.103847 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Lazović, Jelena
AU  - Panjan, Matjaž
AU  - Kralj, Slavko
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10189
AB  - Controlled spatial arrangements of superparamagnetic iron oxide nanoparticles (SPIONs) in complex nanostructures determine fine tuning of physico-chemical properties which, in turn, may lead to new practical applications. We report here on newly observed properties of hierarchical SPIONs nanostructure with bundle-like morphology, also known as nanobundles. Colloidal chemical processes and sol-gel synthesis were used for the synthesis of nanobundles, i.e. i) self-assembly of SPIONs into magnetic nanoparticle clusters, ii) their magnetic assembly to the nanochains, and finally iii) formation of bundle-like hierarchical nanostructure. An XRPD measurements show spinel crystal structure of maghemite/magnetite nanoparticles, EDS analysis reveals Fe, Si and O as main elements whereas SEM/TEM analysis show silica-coated magnetic nanoclusters (∼100 nm) and their hierarchical assemblies with bundle-like morphology of ∼8 μm length and ∼1 μm width. TEM analysis revealed core-shell nature of iron oxide nanoparticle clusters with their size of around 80 nm that were coated by an amorphous silica shell with thickness of ∼15 nm. The nanoclusters in the core are constructed of maghemite/magnetite nanoparticle assembly with primary iron oxide nanoparticle size about 10 nm. The magnetization M data as a function of an applied external magnetic field H were successfully fitted by the Langevin function, whence the magnetic moment μp = 19256 μB, and the diameter d = 9.6 nm of nanoparticles were determined. Microsized bundle-like particles are superparamagnetic, magnetically guidable and possess high transverse relaxivity of r2 = 397.8 mM−1s−1. Magnetic properties and such high value of transverse relaxivity holds promise for nanobundles application in MRI imaging (MRI contrast agent), as nanobundles may enhance the magnetic field in their surroundings and enhance proton relaxation processes. Our nanobundles can open new opportunities in the biomedical applications, magnetic separation, photonic crystals and magnetic liquid manipulation and can be inspiration for synthesizing novel self-assembled nanoparticle structures. © 2022 Elsevier Ltd and Techna Group S.r.l.
T2  - Ceramics International
T1  - Hierarchical iron oxide nanocomposite: Bundle-like morphology, magnetic properties and potential biomedical application
SP  - Early view
DO  - 10.1016/j.ceramint.2022.02.145
ER  - 

@article{
author = "Tadić, Marin and Lazović, Jelena and Panjan, Matjaž and Kralj, Slavko",
year = "2022",
abstract = "Controlled spatial arrangements of superparamagnetic iron oxide nanoparticles (SPIONs) in complex nanostructures determine fine tuning of physico-chemical properties which, in turn, may lead to new practical applications. We report here on newly observed properties of hierarchical SPIONs nanostructure with bundle-like morphology, also known as nanobundles. Colloidal chemical processes and sol-gel synthesis were used for the synthesis of nanobundles, i.e. i) self-assembly of SPIONs into magnetic nanoparticle clusters, ii) their magnetic assembly to the nanochains, and finally iii) formation of bundle-like hierarchical nanostructure. An XRPD measurements show spinel crystal structure of maghemite/magnetite nanoparticles, EDS analysis reveals Fe, Si and O as main elements whereas SEM/TEM analysis show silica-coated magnetic nanoclusters (∼100 nm) and their hierarchical assemblies with bundle-like morphology of ∼8 μm length and ∼1 μm width. TEM analysis revealed core-shell nature of iron oxide nanoparticle clusters with their size of around 80 nm that were coated by an amorphous silica shell with thickness of ∼15 nm. The nanoclusters in the core are constructed of maghemite/magnetite nanoparticle assembly with primary iron oxide nanoparticle size about 10 nm. The magnetization M data as a function of an applied external magnetic field H were successfully fitted by the Langevin function, whence the magnetic moment μp = 19256 μB, and the diameter d = 9.6 nm of nanoparticles were determined. Microsized bundle-like particles are superparamagnetic, magnetically guidable and possess high transverse relaxivity of r2 = 397.8 mM−1s−1. Magnetic properties and such high value of transverse relaxivity holds promise for nanobundles application in MRI imaging (MRI contrast agent), as nanobundles may enhance the magnetic field in their surroundings and enhance proton relaxation processes. Our nanobundles can open new opportunities in the biomedical applications, magnetic separation, photonic crystals and magnetic liquid manipulation and can be inspiration for synthesizing novel self-assembled nanoparticle structures. © 2022 Elsevier Ltd and Techna Group S.r.l.",
journal = "Ceramics International",
title = "Hierarchical iron oxide nanocomposite: Bundle-like morphology, magnetic properties and potential biomedical application",
pages = "Early view",
doi = "10.1016/j.ceramint.2022.02.145"
}

Tadić, M., Lazović, J., Panjan, M.,& Kralj, S.. (2022). Hierarchical iron oxide nanocomposite: Bundle-like morphology, magnetic properties and potential biomedical application. in Ceramics International, Early view.
https://doi.org/10.1016/j.ceramint.2022.02.145

Tadić M, Lazović J, Panjan M, Kralj S. Hierarchical iron oxide nanocomposite: Bundle-like morphology, magnetic properties and potential biomedical application. in Ceramics International. 2022;:Early view.
doi:10.1016/j.ceramint.2022.02.145 .

Tadić, Marin, Lazović, Jelena, Panjan, Matjaž, Kralj, Slavko, "Hierarchical iron oxide nanocomposite: Bundle-like morphology, magnetic properties and potential biomedical application" in Ceramics International (2022):Early view,
https://doi.org/10.1016/j.ceramint.2022.02.145 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Vučetić Tadić, Biljana
AU  - Kralj, Slavko
AU  - Lazović, Jelena
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10102
AB  - A porous hematite/alumina nanocomposite is produced by sol-gel combustion synthesis. The XRPD, Raman and FTIR methods show the presence of α-Fe2O3 phase while SEM, TEM, EDS and BET techniques further reveal the formation of porous ellipsoid-like nanostructure of hematite nanoparticles coated by amorphous alumina. Hematite nanoparticles have a size of ~40 nm whereas the porous hematite/alumina nanocomposite particles are ~100 nm in size with characteristic pores of ~7 nm. The M(H) at 300 K exhibits coercivity HC = 293 Oe and magnetization MS = 2.71 emu/g and at 5 K HC = 1150 Oe and MS = 9.25 emu/g. The M(T) under H = 100 Oe shows a bifurcation between ZFC/FC magnetization curves at all measurement temperatures Tirr>350 K (irreversibility temperature) and blocking temperature at TB ~ 305 K. Unexpectedly, the M(T) measurements under H = 10 kOe reveal the suppressed Morin transition at TM = 225 K. The analysis of the results and data from the literature reveal that the porous surface structure of hematite induces the atypical magnetic properties. A magnetic resonance imaging (MRI) properties show the transverse relaxivity rate (r2) of 0.44 mM−1s−1 at 7 T and 1.06 mM−1s−1 at 15.2 T. The investigated nanocomposite particles could be useful in biomedical applications due to their low cytotoxicity and porous nanostructure.
T2  - Ceramics International
T1  - Magnetic properties of mesoporous hematite/alumina nanocomposite and evaluation for biomedical applications
DO  - 10.1016/j.ceramint.2021.12.209
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Vučetić Tadić, Biljana and Kralj, Slavko and Lazović, Jelena",
year = "2021",
abstract = "A porous hematite/alumina nanocomposite is produced by sol-gel combustion synthesis. The XRPD, Raman and FTIR methods show the presence of α-Fe2O3 phase while SEM, TEM, EDS and BET techniques further reveal the formation of porous ellipsoid-like nanostructure of hematite nanoparticles coated by amorphous alumina. Hematite nanoparticles have a size of ~40 nm whereas the porous hematite/alumina nanocomposite particles are ~100 nm in size with characteristic pores of ~7 nm. The M(H) at 300 K exhibits coercivity HC = 293 Oe and magnetization MS = 2.71 emu/g and at 5 K HC = 1150 Oe and MS = 9.25 emu/g. The M(T) under H = 100 Oe shows a bifurcation between ZFC/FC magnetization curves at all measurement temperatures Tirr>350 K (irreversibility temperature) and blocking temperature at TB ~ 305 K. Unexpectedly, the M(T) measurements under H = 10 kOe reveal the suppressed Morin transition at TM = 225 K. The analysis of the results and data from the literature reveal that the porous surface structure of hematite induces the atypical magnetic properties. A magnetic resonance imaging (MRI) properties show the transverse relaxivity rate (r2) of 0.44 mM−1s−1 at 7 T and 1.06 mM−1s−1 at 15.2 T. The investigated nanocomposite particles could be useful in biomedical applications due to their low cytotoxicity and porous nanostructure.",
journal = "Ceramics International",
title = "Magnetic properties of mesoporous hematite/alumina nanocomposite and evaluation for biomedical applications",
doi = "10.1016/j.ceramint.2021.12.209"
}

Tadić, M., Panjan, M., Vučetić Tadić, B., Kralj, S.,& Lazović, J.. (2021). Magnetic properties of mesoporous hematite/alumina nanocomposite and evaluation for biomedical applications. in Ceramics International.
https://doi.org/10.1016/j.ceramint.2021.12.209

Tadić M, Panjan M, Vučetić Tadić B, Kralj S, Lazović J. Magnetic properties of mesoporous hematite/alumina nanocomposite and evaluation for biomedical applications. in Ceramics International. 2021;.
doi:10.1016/j.ceramint.2021.12.209 .

Tadić, Marin, Panjan, Matjaž, Vučetić Tadić, Biljana, Kralj, Slavko, Lazović, Jelena, "Magnetic properties of mesoporous hematite/alumina nanocomposite and evaluation for biomedical applications" in Ceramics International (2021),
https://doi.org/10.1016/j.ceramint.2021.12.209 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Trpkov, Đorđe
AU  - Kopanja, Lazar
AU  - Vojnović, Sandra
AU  - Panjan, Matjaž
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0925838819312587
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8133
AB  - In this work, we present the magnetic and structural properties of α-Fe 2 O 3 nanoparticles synthesized by the hydrothermal synthesis method. XRD, FTIR and Raman spectroscopy indicate that the samples consist of single-phase α-Fe 2 O 3 nanoparticles. A microstructural analysis by TEM and SEM shows: (i) irregular nanoparticles (∼50 nm), (ii) plate-like nanoparticles (with thickness t∼10 nm and diameter d∼50–80 nm) and (iii) microsized ellipsoid 3D superstructures (with length l∼3.5 and diameter d∼1.5 μm) composed of nanosized building blocks (∼50 nm). We used circularity, elongation and convexity measures to quantitatively analyze the shape of the particles. Irregular hematite nanoparticles were synthesized using a water solution of ferric precursor and sodium acetate during the hydrothermal reaction (reaction conditions: T = 180 °C, t = 12 h). The same hydrothermal reaction temperature, reaction duration and ferric precursor (without sodium acetate) were used for synthesizing hematite ellipsoid 3D superstructures. Addition of urea and glycine surfactants in hydrothermal reaction resulted in the formation of nanoplate hematite particles. The role of these surfactants on the structure and morphology of the particles was also investigated. Magnetic measurements at the room temperature displayed a wide range of coercivities, from H C = 73 Oe for irregular nanoparticles, H C = 689 Oe for nanoplates to H C = 2688 Oe for hematite ellipsoid 3D superstructures. The measured coercivity for the ellipsoid superstructure was about 35 times higher than in the case of irregular hematite nanoparticles and about 4 times than the coercivity of hematite nanoplates. Magnetic properties of synthesized samples were related to their structure and morphology. We conclude that shape anisotropy influenced enhancement of the coercivity in hematite nanoplates whereas hematite ellipsoid 3D superstructure (nanoparticle clusters) induced the formation of multidomain magnetic structure and highest coercivity revealing its superior structure for enhanced magnetic properties. The synthesized hematite nanoparticle structures exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating a safe use of these nanoparticles for practical applications. © 2019 Elsevier B.V.
T2  - Journal of Alloys and Compounds
T1  - Hydrothermal synthesis of hematite (α-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties
VL  - 792
SP  - 599
EP  - 609
DO  - 10.1016/j.jallcom.2019.03.414
ER  - 

@article{
author = "Tadić, Marin and Trpkov, Đorđe and Kopanja, Lazar and Vojnović, Sandra and Panjan, Matjaž",
year = "2019",
abstract = "In this work, we present the magnetic and structural properties of α-Fe 2 O 3 nanoparticles synthesized by the hydrothermal synthesis method. XRD, FTIR and Raman spectroscopy indicate that the samples consist of single-phase α-Fe 2 O 3 nanoparticles. A microstructural analysis by TEM and SEM shows: (i) irregular nanoparticles (∼50 nm), (ii) plate-like nanoparticles (with thickness t∼10 nm and diameter d∼50–80 nm) and (iii) microsized ellipsoid 3D superstructures (with length l∼3.5 and diameter d∼1.5 μm) composed of nanosized building blocks (∼50 nm). We used circularity, elongation and convexity measures to quantitatively analyze the shape of the particles. Irregular hematite nanoparticles were synthesized using a water solution of ferric precursor and sodium acetate during the hydrothermal reaction (reaction conditions: T = 180 °C, t = 12 h). The same hydrothermal reaction temperature, reaction duration and ferric precursor (without sodium acetate) were used for synthesizing hematite ellipsoid 3D superstructures. Addition of urea and glycine surfactants in hydrothermal reaction resulted in the formation of nanoplate hematite particles. The role of these surfactants on the structure and morphology of the particles was also investigated. Magnetic measurements at the room temperature displayed a wide range of coercivities, from H C = 73 Oe for irregular nanoparticles, H C = 689 Oe for nanoplates to H C = 2688 Oe for hematite ellipsoid 3D superstructures. The measured coercivity for the ellipsoid superstructure was about 35 times higher than in the case of irregular hematite nanoparticles and about 4 times than the coercivity of hematite nanoplates. Magnetic properties of synthesized samples were related to their structure and morphology. We conclude that shape anisotropy influenced enhancement of the coercivity in hematite nanoplates whereas hematite ellipsoid 3D superstructure (nanoparticle clusters) induced the formation of multidomain magnetic structure and highest coercivity revealing its superior structure for enhanced magnetic properties. The synthesized hematite nanoparticle structures exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating a safe use of these nanoparticles for practical applications. © 2019 Elsevier B.V.",
journal = "Journal of Alloys and Compounds",
title = "Hydrothermal synthesis of hematite (α-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties",
volume = "792",
pages = "599-609",
doi = "10.1016/j.jallcom.2019.03.414"
}

Tadić, M., Trpkov, Đ., Kopanja, L., Vojnović, S.,& Panjan, M.. (2019). Hydrothermal synthesis of hematite (α-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties. in Journal of Alloys and Compounds, 792, 599-609.
https://doi.org/10.1016/j.jallcom.2019.03.414

Tadić M, Trpkov Đ, Kopanja L, Vojnović S, Panjan M. Hydrothermal synthesis of hematite (α-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties. in Journal of Alloys and Compounds. 2019;792:599-609.
doi:10.1016/j.jallcom.2019.03.414 .

Tadić, Marin, Trpkov, Đorđe, Kopanja, Lazar, Vojnović, Sandra, Panjan, Matjaž, "Hydrothermal synthesis of hematite (α-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties" in Journal of Alloys and Compounds, 792 (2019):599-609,
https://doi.org/10.1016/j.jallcom.2019.03.414 . .

TY  - JOUR
AU  - Trpkov, Đorđe
AU  - Panjan, Matjaž
AU  - Kopanja, Lazar
AU  - Tadić, Marin
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0169433218317872
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7770
AB  - We report on glycine-free and glycine-assisted hydrothermal synthesis of microsized superstructures composed of self-assembled hematite nanoparticles. An X-ray powder diffraction measurements of the samples confirm good crystallization of the hematite nanoparticles with hydrothermal reaction time-dependent crystallite sizes in a range from ∼15 nm (45 h) to ∼26 nm (90 h). The FTIR and Raman spectroscopy confirm hematite structure, whereas TEM measurements reveal nanoparticle sub-units (subparticles). The computational analyses of particle shape show that the addition of glycine surfactant in hydrothermal reaction leads to more spherical shape of hematite hierarchical structures and smaller sizes. We found strong coercivity increases (up to ∼3 times) in the samples synthesized in the presence of glycine. The coercivity values from HC = 1305 Oe (mushroom-like shape synthesized by glycine-free hydrothermal reaction) to HC = 3725 Oe (sphere-like shape synthesized by glycine-assisted hydrothermal reaction) were obtained at 300 K. These results and their comparison with other described in the literature (e.g. bulk, wires, urchin-like, rods, tubes, plates, star-like, dendrites, platelets, irregular, nanocolumns, spindles, disks hematites, etc.) reveal that the hematite superstructures possess good magnetic properties. We propose that the glycine, oriented subparticles, exchange and dipole-dipole interactions may play an important role in the development of magnetic properties.
T2  - Applied Surface Science
T1  - Hydrothermal synthesis, morphology, magnetic properties and self-assembly of hierarchical α-Fe2O3 (hematite) mushroom-, cube- and sphere-like superstructures
VL  - 457
SP  - 427
EP  - 438
DO  - 10.1016/j.apsusc.2018.06.224
ER  - 

@article{
author = "Trpkov, Đorđe and Panjan, Matjaž and Kopanja, Lazar and Tadić, Marin",
year = "2018",
abstract = "We report on glycine-free and glycine-assisted hydrothermal synthesis of microsized superstructures composed of self-assembled hematite nanoparticles. An X-ray powder diffraction measurements of the samples confirm good crystallization of the hematite nanoparticles with hydrothermal reaction time-dependent crystallite sizes in a range from ∼15 nm (45 h) to ∼26 nm (90 h). The FTIR and Raman spectroscopy confirm hematite structure, whereas TEM measurements reveal nanoparticle sub-units (subparticles). The computational analyses of particle shape show that the addition of glycine surfactant in hydrothermal reaction leads to more spherical shape of hematite hierarchical structures and smaller sizes. We found strong coercivity increases (up to ∼3 times) in the samples synthesized in the presence of glycine. The coercivity values from HC = 1305 Oe (mushroom-like shape synthesized by glycine-free hydrothermal reaction) to HC = 3725 Oe (sphere-like shape synthesized by glycine-assisted hydrothermal reaction) were obtained at 300 K. These results and their comparison with other described in the literature (e.g. bulk, wires, urchin-like, rods, tubes, plates, star-like, dendrites, platelets, irregular, nanocolumns, spindles, disks hematites, etc.) reveal that the hematite superstructures possess good magnetic properties. We propose that the glycine, oriented subparticles, exchange and dipole-dipole interactions may play an important role in the development of magnetic properties.",
journal = "Applied Surface Science",
title = "Hydrothermal synthesis, morphology, magnetic properties and self-assembly of hierarchical α-Fe2O3 (hematite) mushroom-, cube- and sphere-like superstructures",
volume = "457",
pages = "427-438",
doi = "10.1016/j.apsusc.2018.06.224"
}

Trpkov, Đ., Panjan, M., Kopanja, L.,& Tadić, M.. (2018). Hydrothermal synthesis, morphology, magnetic properties and self-assembly of hierarchical α-Fe2O3 (hematite) mushroom-, cube- and sphere-like superstructures. in Applied Surface Science, 457, 427-438.
https://doi.org/10.1016/j.apsusc.2018.06.224

Trpkov Đ, Panjan M, Kopanja L, Tadić M. Hydrothermal synthesis, morphology, magnetic properties and self-assembly of hierarchical α-Fe2O3 (hematite) mushroom-, cube- and sphere-like superstructures. in Applied Surface Science. 2018;457:427-438.
doi:10.1016/j.apsusc.2018.06.224 .

Trpkov, Đorđe, Panjan, Matjaž, Kopanja, Lazar, Tadić, Marin, "Hydrothermal synthesis, morphology, magnetic properties and self-assembly of hierarchical α-Fe2O3 (hematite) mushroom-, cube- and sphere-like superstructures" in Applied Surface Science, 457 (2018):427-438,
https://doi.org/10.1016/j.apsusc.2018.06.224 . .

TY  - JOUR
AU  - Nikolić, Violeta N.
AU  - Spasojević, Vojislav
AU  - Panjan, Matjaž
AU  - Kopanja, Lazar
AU  - Mraković, Ana Đ.
AU  - Tadić, Marin
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1559
AB  - Several Fe2O3/SiO2 nanostructures were synthesized by the combination of the microemulsion and a sol-gel methods. Based on X-ray powder diffraction (XRD) and magnetic measurements (giant coercivity similar to 2.13 T) we identified epsilon-Fe2O3 (hard magnet) as the dominant crystalline phase. TEM analysis showed a wide size distribution of iron oxide nanoparticles (from 4 to 50 nm) with various morphologies (spherical, ellipsoidal and rod-like). We quantitatively described (computational analysis, MATLAB code) morphological properties of nanoparticles using the ellipticity of the shapes. The as-synthesized hard magnetic material was subjected to a post-annealing treatment at different temperatures (200, 500, 750, 1000 and 1100 degrees C) in order to investigate stability, formation and transformation of the epsilon-Fe2O3 polymorph. We found decreasing coercivity in the thermally treated samples up to the temperature of 750 degrees C (H-c=1245 Oe), followed by an observation of a surprising jump in coercivity H-c similar to 1.5 T after post-annealing at 1000 degrees C. We conclude that the re-formation of the epsilon-Fe2O3 structure during post-annealing at 1000 degrees C is the origin of the observed phenomena. The phase transformation epsilon-Fe2O3 - GT alpha-Fe2O3 and crystallization of amorphous silica in quartz and cristobalite were observed in the sample treated at 1100 degrees C.
T2  - Ceramics International
T1  - Re-formation of metastable epsilon-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties
VL  - 43
IS  - 10
SP  - 7497
EP  - 7507
DO  - 10.1016/j.ceramint.2017.03.030
ER  - 

@article{
author = "Nikolić, Violeta N. and Spasojević, Vojislav and Panjan, Matjaž and Kopanja, Lazar and Mraković, Ana Đ. and Tadić, Marin",
year = "2017",
abstract = "Several Fe2O3/SiO2 nanostructures were synthesized by the combination of the microemulsion and a sol-gel methods. Based on X-ray powder diffraction (XRD) and magnetic measurements (giant coercivity similar to 2.13 T) we identified epsilon-Fe2O3 (hard magnet) as the dominant crystalline phase. TEM analysis showed a wide size distribution of iron oxide nanoparticles (from 4 to 50 nm) with various morphologies (spherical, ellipsoidal and rod-like). We quantitatively described (computational analysis, MATLAB code) morphological properties of nanoparticles using the ellipticity of the shapes. The as-synthesized hard magnetic material was subjected to a post-annealing treatment at different temperatures (200, 500, 750, 1000 and 1100 degrees C) in order to investigate stability, formation and transformation of the epsilon-Fe2O3 polymorph. We found decreasing coercivity in the thermally treated samples up to the temperature of 750 degrees C (H-c=1245 Oe), followed by an observation of a surprising jump in coercivity H-c similar to 1.5 T after post-annealing at 1000 degrees C. We conclude that the re-formation of the epsilon-Fe2O3 structure during post-annealing at 1000 degrees C is the origin of the observed phenomena. The phase transformation epsilon-Fe2O3 - GT alpha-Fe2O3 and crystallization of amorphous silica in quartz and cristobalite were observed in the sample treated at 1100 degrees C.",
journal = "Ceramics International",
title = "Re-formation of metastable epsilon-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties",
volume = "43",
number = "10",
pages = "7497-7507",
doi = "10.1016/j.ceramint.2017.03.030"
}

Nikolić, V. N., Spasojević, V., Panjan, M., Kopanja, L., Mraković, A. Đ.,& Tadić, M.. (2017). Re-formation of metastable epsilon-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties. in Ceramics International, 43(10), 7497-7507.
https://doi.org/10.1016/j.ceramint.2017.03.030

Nikolić VN, Spasojević V, Panjan M, Kopanja L, Mraković AĐ, Tadić M. Re-formation of metastable epsilon-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties. in Ceramics International. 2017;43(10):7497-7507.
doi:10.1016/j.ceramint.2017.03.030 .

Nikolić, Violeta N., Spasojević, Vojislav, Panjan, Matjaž, Kopanja, Lazar, Mraković, Ana Đ., Tadić, Marin, "Re-formation of metastable epsilon-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties" in Ceramics International, 43, no. 10 (2017):7497-7507,
https://doi.org/10.1016/j.ceramint.2017.03.030 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Kopanja, Lazar
AU  - Panjan, Matjaž
AU  - Kralj, Slavko
AU  - Nikodinović-Runić, Jasmina
AU  - Stojanović, Zoran S.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1449
AB  - Hematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase alpha-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio 5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity H-C = 2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Synthesis of core-shell hematite (alpha-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity
VL  - 403
SP  - 628
EP  - 634
DO  - 10.1016/j.apsusc.2017.01.115
ER  - 

@article{
author = "Tadić, Marin and Kopanja, Lazar and Panjan, Matjaž and Kralj, Slavko and Nikodinović-Runić, Jasmina and Stojanović, Zoran S.",
year = "2017",
abstract = "Hematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase alpha-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio 5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity H-C = 2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Synthesis of core-shell hematite (alpha-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity",
volume = "403",
pages = "628-634",
doi = "10.1016/j.apsusc.2017.01.115"
}

Tadić, M., Kopanja, L., Panjan, M., Kralj, S., Nikodinović-Runić, J.,& Stojanović, Z. S.. (2017). Synthesis of core-shell hematite (alpha-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity. in Applied Surface Science, 403, 628-634.
https://doi.org/10.1016/j.apsusc.2017.01.115

Tadić M, Kopanja L, Panjan M, Kralj S, Nikodinović-Runić J, Stojanović ZS. Synthesis of core-shell hematite (alpha-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity. in Applied Surface Science. 2017;403:628-634.
doi:10.1016/j.apsusc.2017.01.115 .

Tadić, Marin, Kopanja, Lazar, Panjan, Matjaž, Kralj, Slavko, Nikodinović-Runić, Jasmina, Stojanović, Zoran S., "Synthesis of core-shell hematite (alpha-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity" in Applied Surface Science, 403 (2017):628-634,
https://doi.org/10.1016/j.apsusc.2017.01.115 . .

TY  - JOUR
AU  - Nikolić, Violeta N.
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Kopanja, Lazar
AU  - Cvjetićanin, Nikola
AU  - Spasojević, Vojislav
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1400
AB  - Magnetic properties of Fe2O3/SiO2 samples were studied after being produced by sol-gel synthesis and formation of epsilon-Fe2O3 polymorph. Samples were thermally treated, using different annealing temperatures and annealing times. The size and morphological characteristics of the iron oxide nanoparticles were examined using a TEM microscope. We used the ellipticity of shapes, which is a measure of how much the shape of a nanoparticle differs from a perfect ellipse, in order to quantitatively describe morphological properties of nanoparticles. Coercivity measurements were used to identify and monitor the formation of the epsilon-iron oxide phase during the thermal treatments (annealing). Coercivity values were in the range from 1.2 to 15.4 kOe, which is in accordance with previous experience regarding the existence of epsilon-Fe2O3. We have determined the optimal formation conditions for the epsilon-Fe2O3 polymorph (t=1050 degrees C for 7 h, H-c=15.4 kOe), as well as the narrow temperature interval (1050-1060 C) in which the polymorph abruptly vanished (H-c=2300 Oe), on the basis of results of the magnetic properties. The threshold temperature for the epsilon-Fe2O3 phase transformation was measured as 1060 degrees C. We found that different annealing temperatures and annealing times significantly affected magnetic properties of the examined samples.
T2  - Ceramics International
T1  - Influence of annealing treatment on magnetic properties of Fe2O3/SiO2 and formation of epsilon-Fe2O3 phase
VL  - 43
IS  - 3
SP  - 3147
EP  - 3155
DO  - 10.1016/j.ceramint.2016.11.132
ER  - 

@article{
author = "Nikolić, Violeta N. and Tadić, Marin and Panjan, Matjaž and Kopanja, Lazar and Cvjetićanin, Nikola and Spasojević, Vojislav",
year = "2017",
abstract = "Magnetic properties of Fe2O3/SiO2 samples were studied after being produced by sol-gel synthesis and formation of epsilon-Fe2O3 polymorph. Samples were thermally treated, using different annealing temperatures and annealing times. The size and morphological characteristics of the iron oxide nanoparticles were examined using a TEM microscope. We used the ellipticity of shapes, which is a measure of how much the shape of a nanoparticle differs from a perfect ellipse, in order to quantitatively describe morphological properties of nanoparticles. Coercivity measurements were used to identify and monitor the formation of the epsilon-iron oxide phase during the thermal treatments (annealing). Coercivity values were in the range from 1.2 to 15.4 kOe, which is in accordance with previous experience regarding the existence of epsilon-Fe2O3. We have determined the optimal formation conditions for the epsilon-Fe2O3 polymorph (t=1050 degrees C for 7 h, H-c=15.4 kOe), as well as the narrow temperature interval (1050-1060 C) in which the polymorph abruptly vanished (H-c=2300 Oe), on the basis of results of the magnetic properties. The threshold temperature for the epsilon-Fe2O3 phase transformation was measured as 1060 degrees C. We found that different annealing temperatures and annealing times significantly affected magnetic properties of the examined samples.",
journal = "Ceramics International",
title = "Influence of annealing treatment on magnetic properties of Fe2O3/SiO2 and formation of epsilon-Fe2O3 phase",
volume = "43",
number = "3",
pages = "3147-3155",
doi = "10.1016/j.ceramint.2016.11.132"
}

Nikolić, V. N., Tadić, M., Panjan, M., Kopanja, L., Cvjetićanin, N.,& Spasojević, V.. (2017). Influence of annealing treatment on magnetic properties of Fe2O3/SiO2 and formation of epsilon-Fe2O3 phase. in Ceramics International, 43(3), 3147-3155.
https://doi.org/10.1016/j.ceramint.2016.11.132

Nikolić VN, Tadić M, Panjan M, Kopanja L, Cvjetićanin N, Spasojević V. Influence of annealing treatment on magnetic properties of Fe2O3/SiO2 and formation of epsilon-Fe2O3 phase. in Ceramics International. 2017;43(3):3147-3155.
doi:10.1016/j.ceramint.2016.11.132 .

Nikolić, Violeta N., Tadić, Marin, Panjan, Matjaž, Kopanja, Lazar, Cvjetićanin, Nikola, Spasojević, Vojislav, "Influence of annealing treatment on magnetic properties of Fe2O3/SiO2 and formation of epsilon-Fe2O3 phase" in Ceramics International, 43, no. 3 (2017):3147-3155,
https://doi.org/10.1016/j.ceramint.2016.11.132 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Marković, Dragana
AU  - Panjan, Matjaž
AU  - Spasojević, Vojislav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1317
AB  - We present a modified solution combustion synthesis method and measured magnetic properties of CaMnO3-delta (calcium manganite). The structure, morphology and magnetic properties of CaMnO3-delta were investigated by XRPD (X-ray powder diffraction), TEM (transmission electron microscopy), HRTEM (high-resolution transmission electron microscopy) and SQUID (superconducting quantum interference device). The XRPD study revealed that the prepared sample is composed of pure calcium manganite phase. The TEM and HRTEM images showed well-crystallized particles with a rough surface and particle size of about 100 nm. Magnetization measurements revealed magnetic transition at T-N=120 K, which corresponds to the Neel temperature of calcium manganite. Paramagnetic behavior was measured above the TN temperature. High irreversibility between the ZFC (zero-field cooled) and the FC (field cooled) curves below TN were observed. In addition, the separation between ZFC and FC curves increased with increasing magnetic field. We also show that the temperature values at the maxima of the ZFC curves are insensitive to the value of the applied DC magnetic field and to the frequency of the AC magnetic field. Magnetic measurements also indicate the presence of a strong antiferromagnetic exchange coupling with a Curie-Weiss temperature theta=-436 K. Magnetic moment of 4.33 mu(B) per Mn ion is determined from the Curie constant. This value of the magnetic moment suggests that Mn3+ and Mn4+ ions exist in the sample. Measurements of the magnetic hysteresis properties indicate a contribution of a ferromagnetic-like component in the sample. This is revealed by large coercivity and high remanence magnetization below TN. In this work we also studied field-cooled (up to 5 T) hysteresis properties of the sample. The detailed analysis of these results suggests a minor hysteresis loop behavior and no exchange bias.
T2  - Ceramics International
T1  - Solution combustion synthesis method and magnetic properties of synthesized polycrystalline calcium manganite CaMnO3-delta powder
VL  - 42
IS  - 16
SP  - 19365
EP  - 19371
DO  - 10.1016/j.ceramint.2016.09.109
ER  - 

@article{
author = "Tadić, Marin and Marković, Dragana and Panjan, Matjaž and Spasojević, Vojislav",
year = "2016",
abstract = "We present a modified solution combustion synthesis method and measured magnetic properties of CaMnO3-delta (calcium manganite). The structure, morphology and magnetic properties of CaMnO3-delta were investigated by XRPD (X-ray powder diffraction), TEM (transmission electron microscopy), HRTEM (high-resolution transmission electron microscopy) and SQUID (superconducting quantum interference device). The XRPD study revealed that the prepared sample is composed of pure calcium manganite phase. The TEM and HRTEM images showed well-crystallized particles with a rough surface and particle size of about 100 nm. Magnetization measurements revealed magnetic transition at T-N=120 K, which corresponds to the Neel temperature of calcium manganite. Paramagnetic behavior was measured above the TN temperature. High irreversibility between the ZFC (zero-field cooled) and the FC (field cooled) curves below TN were observed. In addition, the separation between ZFC and FC curves increased with increasing magnetic field. We also show that the temperature values at the maxima of the ZFC curves are insensitive to the value of the applied DC magnetic field and to the frequency of the AC magnetic field. Magnetic measurements also indicate the presence of a strong antiferromagnetic exchange coupling with a Curie-Weiss temperature theta=-436 K. Magnetic moment of 4.33 mu(B) per Mn ion is determined from the Curie constant. This value of the magnetic moment suggests that Mn3+ and Mn4+ ions exist in the sample. Measurements of the magnetic hysteresis properties indicate a contribution of a ferromagnetic-like component in the sample. This is revealed by large coercivity and high remanence magnetization below TN. In this work we also studied field-cooled (up to 5 T) hysteresis properties of the sample. The detailed analysis of these results suggests a minor hysteresis loop behavior and no exchange bias.",
journal = "Ceramics International",
title = "Solution combustion synthesis method and magnetic properties of synthesized polycrystalline calcium manganite CaMnO3-delta powder",
volume = "42",
number = "16",
pages = "19365-19371",
doi = "10.1016/j.ceramint.2016.09.109"
}

Tadić, M., Marković, D., Panjan, M.,& Spasojević, V.. (2016). Solution combustion synthesis method and magnetic properties of synthesized polycrystalline calcium manganite CaMnO3-delta powder. in Ceramics International, 42(16), 19365-19371.
https://doi.org/10.1016/j.ceramint.2016.09.109

Tadić M, Marković D, Panjan M, Spasojević V. Solution combustion synthesis method and magnetic properties of synthesized polycrystalline calcium manganite CaMnO3-delta powder. in Ceramics International. 2016;42(16):19365-19371.
doi:10.1016/j.ceramint.2016.09.109 .

Tadić, Marin, Marković, Dragana, Panjan, Matjaž, Spasojević, Vojislav, "Solution combustion synthesis method and magnetic properties of synthesized polycrystalline calcium manganite CaMnO3-delta powder" in Ceramics International, 42, no. 16 (2016):19365-19371,
https://doi.org/10.1016/j.ceramint.2016.09.109 . .

TY  - JOUR
AU  - Kopanja, Lazar
AU  - Milošević, Irena
AU  - Panjan, Matjaž
AU  - Damnjanović, Vesna
AU  - Tadić, Marin
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/901
AB  - We report the synthesis and magnetic properties of hematite/amorphous silica nanostructures. Raman spectroscopy showed the formation of a hematite phase. A transmission electron microscopy (TEM) revealed spherically shaped hematite nanoparticles, well-dispersed in an amorphous silica matrix. In order to quantitatively describe morphological properties of nanoparticles, we use the circularity of shapes as a measure of how circular a shape is. Diameters of about 5 nm and a narrow size distribution of nanoparticles are observed. The obtained hematite nanoparticles exhibit superparamagnetic properties at room temperature (SPION). The sample does not display the Morin transition. The FC hysteresis loop at 5 K has shown an exchange bias effect. These results have been compared to those previously reported for alpha-Fe2O3/SiO2 nanosystems in the literature. These comparisons reveal that the sol-gel combustion method yields hematite nanoparticles with a higher magnetization and magnetic moment. These data indicate the existence of an additional factor that contributes to magnetization. We suggest that the increased magnetization is due to an increased number of the surface spins caused by the breaking of large numbers of exchange bonds between surface atoms (disordered structure). This leads to an increase in the magnetic moment per a hematite nanoparticle and an exchange bias effect. We have concluded that the combustion-related part of this synthesis method enhances surface effects, i.e. it promotes the breaking of bonds and surface disordered layers, which results in these magnetic properties. Such interesting structural and magnetic properties of hematite might be important in future practical applications and fundamental research. (C) 2015 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Sol-gel combustion synthesis, particle shape analysis and magnetic properties of hematite (alpha-Fe2O3) nanoparticles embedded in an amorphous silica matrix
VL  - 362
SP  - 380
EP  - 386
DO  - 10.1016/j.apsusc.2015.11.238
ER  - 

@article{
author = "Kopanja, Lazar and Milošević, Irena and Panjan, Matjaž and Damnjanović, Vesna and Tadić, Marin",
year = "2016",
abstract = "We report the synthesis and magnetic properties of hematite/amorphous silica nanostructures. Raman spectroscopy showed the formation of a hematite phase. A transmission electron microscopy (TEM) revealed spherically shaped hematite nanoparticles, well-dispersed in an amorphous silica matrix. In order to quantitatively describe morphological properties of nanoparticles, we use the circularity of shapes as a measure of how circular a shape is. Diameters of about 5 nm and a narrow size distribution of nanoparticles are observed. The obtained hematite nanoparticles exhibit superparamagnetic properties at room temperature (SPION). The sample does not display the Morin transition. The FC hysteresis loop at 5 K has shown an exchange bias effect. These results have been compared to those previously reported for alpha-Fe2O3/SiO2 nanosystems in the literature. These comparisons reveal that the sol-gel combustion method yields hematite nanoparticles with a higher magnetization and magnetic moment. These data indicate the existence of an additional factor that contributes to magnetization. We suggest that the increased magnetization is due to an increased number of the surface spins caused by the breaking of large numbers of exchange bonds between surface atoms (disordered structure). This leads to an increase in the magnetic moment per a hematite nanoparticle and an exchange bias effect. We have concluded that the combustion-related part of this synthesis method enhances surface effects, i.e. it promotes the breaking of bonds and surface disordered layers, which results in these magnetic properties. Such interesting structural and magnetic properties of hematite might be important in future practical applications and fundamental research. (C) 2015 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Sol-gel combustion synthesis, particle shape analysis and magnetic properties of hematite (alpha-Fe2O3) nanoparticles embedded in an amorphous silica matrix",
volume = "362",
pages = "380-386",
doi = "10.1016/j.apsusc.2015.11.238"
}

Kopanja, L., Milošević, I., Panjan, M., Damnjanović, V.,& Tadić, M.. (2016). Sol-gel combustion synthesis, particle shape analysis and magnetic properties of hematite (alpha-Fe2O3) nanoparticles embedded in an amorphous silica matrix. in Applied Surface Science
Elsevier., 362, 380-386.
https://doi.org/10.1016/j.apsusc.2015.11.238

Kopanja L, Milošević I, Panjan M, Damnjanović V, Tadić M. Sol-gel combustion synthesis, particle shape analysis and magnetic properties of hematite (alpha-Fe2O3) nanoparticles embedded in an amorphous silica matrix. in Applied Surface Science. 2016;362:380-386.
doi:10.1016/j.apsusc.2015.11.238 .

Kopanja, Lazar, Milošević, Irena, Panjan, Matjaž, Damnjanović, Vesna, Tadić, Marin, "Sol-gel combustion synthesis, particle shape analysis and magnetic properties of hematite (alpha-Fe2O3) nanoparticles embedded in an amorphous silica matrix" in Applied Surface Science, 362 (2016):380-386,
https://doi.org/10.1016/j.apsusc.2015.11.238 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Nikolic, Dobrica
AU  - Panjan, Matjaž
AU  - Blake, Graeme R.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/734
AB  - Crystalline nickel oxide (NiO) nanoparticles dispersed in an amorphous silica matrix have been prepared by a sol-gel combustion synthesis method. The sample was characterized using X-ray powder diffraction, energy-dispersive X-ray spectroscopy, scanning electron microscopy, transmission electron microscopy and superconducting quantum interference device magnetometry. The nanoparticles were spherical with an average size of about 5 nm and narrow particle size distribution. The magnetization measurements revealed two maxima in the zero-field cooled magnetization curve at 5 K and 56 K. An analysis of DC and AC magnetic susceptibility measurements revealed that the higher temperature maximum corresponded to the onset of antiferromagnetic ordering within the particles. The Neel temperature of T-N = 56 K is much lower than in bulk NiO. The 5 K maximum corresponded to the particle blocking temperature TB. The frequency dependence of TB was successfully fitted using the Vogel-Fulcher law, indicating the presence of weak inter-particle interactions (C-1 = 0.08 and C-2 = 0.76). A Curie-Weiss law fit to the magnetic susceptibility above T-N revealed antiferromagnetic exchange interactions with a Curie-Weiss temperature of theta = 24 K and an effective magnetic moment of mu(eff) = 2.87 mu(B) per NiO unit. We conclude that these magnetic properties can be attributed to the smallness of the NiO nanoparticles and to crystal lattice defects. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Magnetic properties of NiO (nickel oxide) nanoparticles: Blocking temperature and Neel temperature
VL  - 647
SP  - 1061
EP  - 1068
DO  - 10.1016/j.jallcom.2015.06.027
ER  - 

@article{
author = "Tadić, Marin and Nikolic, Dobrica and Panjan, Matjaž and Blake, Graeme R.",
year = "2015",
abstract = "Crystalline nickel oxide (NiO) nanoparticles dispersed in an amorphous silica matrix have been prepared by a sol-gel combustion synthesis method. The sample was characterized using X-ray powder diffraction, energy-dispersive X-ray spectroscopy, scanning electron microscopy, transmission electron microscopy and superconducting quantum interference device magnetometry. The nanoparticles were spherical with an average size of about 5 nm and narrow particle size distribution. The magnetization measurements revealed two maxima in the zero-field cooled magnetization curve at 5 K and 56 K. An analysis of DC and AC magnetic susceptibility measurements revealed that the higher temperature maximum corresponded to the onset of antiferromagnetic ordering within the particles. The Neel temperature of T-N = 56 K is much lower than in bulk NiO. The 5 K maximum corresponded to the particle blocking temperature TB. The frequency dependence of TB was successfully fitted using the Vogel-Fulcher law, indicating the presence of weak inter-particle interactions (C-1 = 0.08 and C-2 = 0.76). A Curie-Weiss law fit to the magnetic susceptibility above T-N revealed antiferromagnetic exchange interactions with a Curie-Weiss temperature of theta = 24 K and an effective magnetic moment of mu(eff) = 2.87 mu(B) per NiO unit. We conclude that these magnetic properties can be attributed to the smallness of the NiO nanoparticles and to crystal lattice defects. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Magnetic properties of NiO (nickel oxide) nanoparticles: Blocking temperature and Neel temperature",
volume = "647",
pages = "1061-1068",
doi = "10.1016/j.jallcom.2015.06.027"
}

Tadić, M., Nikolic, D., Panjan, M.,& Blake, G. R.. (2015). Magnetic properties of NiO (nickel oxide) nanoparticles: Blocking temperature and Neel temperature. in Journal of Alloys and Compounds, 647, 1061-1068.
https://doi.org/10.1016/j.jallcom.2015.06.027

Tadić M, Nikolic D, Panjan M, Blake GR. Magnetic properties of NiO (nickel oxide) nanoparticles: Blocking temperature and Neel temperature. in Journal of Alloys and Compounds. 2015;647:1061-1068.
doi:10.1016/j.jallcom.2015.06.027 .

Tadić, Marin, Nikolic, Dobrica, Panjan, Matjaž, Blake, Graeme R., "Magnetic properties of NiO (nickel oxide) nanoparticles: Blocking temperature and Neel temperature" in Journal of Alloys and Compounds, 647 (2015):1061-1068,
https://doi.org/10.1016/j.jallcom.2015.06.027 . .

TY  - JOUR
AU  - Nikolic, Dobrica
AU  - Panjan, Matjaž
AU  - Blake, Graeme R.
AU  - Tadić, Marin
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/717
AB  - We show that annealing at high temperatures has a significant effect on the structural and magnetic properties of NiO/SiO2 nanostructures synthesized by a sol-gel combustion method. Samples underwent heat treatments at 500 degrees C, 800 degrees C, 950 degrees C and 1100 degrees C. As compared to the 500 degrees C sample, the 800 degrees C sample showed the following magnetic properties: much higher irreversibility temperature, a significantly broadened zero-field-cooled (ZFC) magnetization maximum, a decrease of the ZFC magnetization, an increase of the coercivity, and weaker inter-particle interactions. These changes can be attributed to agglomeration of nanoparticles in part of the sample. We believe that this agglomeration can be explained by the removal of thin regions of silica that separate nanoparticles in close proximity during the annealing process at 800 degrees C. Magnetic measurements for the 1100 sample reveal both an abrupt increase in size of the NiO nanoparticles, which is confirmed by TEM and XRPD measurements, and an increase in inter-particle interaction strength. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Journal of the European Ceramic Society
T1  - Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix
VL  - 35
IS  - 14
SP  - 3843
EP  - 3852
DO  - 10.1016/j.jeurceramsoc.2015.06.024
ER  - 

@article{
author = "Nikolic, Dobrica and Panjan, Matjaž and Blake, Graeme R. and Tadić, Marin",
year = "2015",
abstract = "We show that annealing at high temperatures has a significant effect on the structural and magnetic properties of NiO/SiO2 nanostructures synthesized by a sol-gel combustion method. Samples underwent heat treatments at 500 degrees C, 800 degrees C, 950 degrees C and 1100 degrees C. As compared to the 500 degrees C sample, the 800 degrees C sample showed the following magnetic properties: much higher irreversibility temperature, a significantly broadened zero-field-cooled (ZFC) magnetization maximum, a decrease of the ZFC magnetization, an increase of the coercivity, and weaker inter-particle interactions. These changes can be attributed to agglomeration of nanoparticles in part of the sample. We believe that this agglomeration can be explained by the removal of thin regions of silica that separate nanoparticles in close proximity during the annealing process at 800 degrees C. Magnetic measurements for the 1100 sample reveal both an abrupt increase in size of the NiO nanoparticles, which is confirmed by TEM and XRPD measurements, and an increase in inter-particle interaction strength. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Journal of the European Ceramic Society",
title = "Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix",
volume = "35",
number = "14",
pages = "3843-3852",
doi = "10.1016/j.jeurceramsoc.2015.06.024"
}

Nikolic, D., Panjan, M., Blake, G. R.,& Tadić, M.. (2015). Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix. in Journal of the European Ceramic Society, 35(14), 3843-3852.
https://doi.org/10.1016/j.jeurceramsoc.2015.06.024

Nikolic D, Panjan M, Blake GR, Tadić M. Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix. in Journal of the European Ceramic Society. 2015;35(14):3843-3852.
doi:10.1016/j.jeurceramsoc.2015.06.024 .

Nikolic, Dobrica, Panjan, Matjaž, Blake, Graeme R., Tadić, Marin, "Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix" in Journal of the European Ceramic Society, 35, no. 14 (2015):3843-3852,
https://doi.org/10.1016/j.jeurceramsoc.2015.06.024 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Marković, Dragana
AU  - Stanojević, Boban
AU  - Jovanovic, Djordje
AU  - Milošević, Irena
AU  - Spasojević, Vojislav
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5787
AB  - We report on ferromagnetic-like magnetic properties, at room temperature, of spherical nickel oxide core-shell nanoparticles synthesized by sol-gel combustion method. The sample is characterized by using transmission electron microscopy (TEM), selected electron area diffraction (SAED), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy (RS) and superconducting quantum interference device (SQUID) magnetometer. The SAED, EDX and RS show high quality and purity of the sample. The TEM images point to core-shell NiO nanostructure with a well crystallized NiO core and surface disorder shell. The size of the nanoparticles of about 5 nm and thickness of the surface shell below 1 nm are estimated from the TEM and HRTEM measurements. The measurements of the magnetization reveals ferromagnetic-like behavior of the sample at room temperature with remanent magnetization M-r = 0.0087 emu/g and coercive field H-C = 115 Oe. These magnetic properties are quite different than in NiO bulk materials and uncommon for nanosized NiO materials. These results also indicate that the synthesized NiO core-shell nanostructure is suitable for spin-valve applications. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - NiO core-shell nanostructure with ferromagnetic-like behavior at room temperature
VL  - 586
SP  - S322
EP  - S325
DO  - 10.1016/j.jallcom.2012.10.166
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Marković, Dragana and Stanojević, Boban and Jovanovic, Djordje and Milošević, Irena and Spasojević, Vojislav",
year = "2014",
abstract = "We report on ferromagnetic-like magnetic properties, at room temperature, of spherical nickel oxide core-shell nanoparticles synthesized by sol-gel combustion method. The sample is characterized by using transmission electron microscopy (TEM), selected electron area diffraction (SAED), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy (RS) and superconducting quantum interference device (SQUID) magnetometer. The SAED, EDX and RS show high quality and purity of the sample. The TEM images point to core-shell NiO nanostructure with a well crystallized NiO core and surface disorder shell. The size of the nanoparticles of about 5 nm and thickness of the surface shell below 1 nm are estimated from the TEM and HRTEM measurements. The measurements of the magnetization reveals ferromagnetic-like behavior of the sample at room temperature with remanent magnetization M-r = 0.0087 emu/g and coercive field H-C = 115 Oe. These magnetic properties are quite different than in NiO bulk materials and uncommon for nanosized NiO materials. These results also indicate that the synthesized NiO core-shell nanostructure is suitable for spin-valve applications. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "NiO core-shell nanostructure with ferromagnetic-like behavior at room temperature",
volume = "586",
pages = "S322-S325",
doi = "10.1016/j.jallcom.2012.10.166"
}

Tadić, M., Panjan, M., Marković, D., Stanojević, B., Jovanovic, D., Milošević, I.,& Spasojević, V.. (2014). NiO core-shell nanostructure with ferromagnetic-like behavior at room temperature. in Journal of Alloys and Compounds, 586, S322-S325.
https://doi.org/10.1016/j.jallcom.2012.10.166

Tadić M, Panjan M, Marković D, Stanojević B, Jovanovic D, Milošević I, Spasojević V. NiO core-shell nanostructure with ferromagnetic-like behavior at room temperature. in Journal of Alloys and Compounds. 2014;586:S322-S325.
doi:10.1016/j.jallcom.2012.10.166 .

Tadić, Marin, Panjan, Matjaž, Marković, Dragana, Stanojević, Boban, Jovanovic, Djordje, Milošević, Irena, Spasojević, Vojislav, "NiO core-shell nanostructure with ferromagnetic-like behavior at room temperature" in Journal of Alloys and Compounds, 586 (2014):S322-S325,
https://doi.org/10.1016/j.jallcom.2012.10.166 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Damnjanović, Vesna
AU  - Milošević, Irena
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/225
AB  - Hematite (alpha-Fe2O3) nanoparticles are successfully synthesized by using the hydrothermal synthesis method. An X-ray powder diffraction (XRPD) of the sample shows formation of the nanocrystalline alpha-Fe2O3 phase. A transmission electron microscopy (TEM) measurements show spherical morphology of the hematite nanoparticles and narrow size distribution. An average hematite nanoparticle size is estimated to be about 8 nm by TEM and XRD. Magnetic properties were measured using a superconducting quantum interference device (SQUID) magnetometry. Investigation of the magnetic properties of hematite nanoparticles showed a divergence between field-cooled (FC) and zero-field-cooled (ZFC) magnetization curves below T-irr =103 K (irreversibility temperature). The ZFC magnetization curve showed maximum at T-B = 52 K (blocking temperature). The sample did not exhibit the Morin transition. The M(H) (magnetization versus magnetic field) dependence at 300 K showed properties of superparamagnetic iron oxide nanoparticles (SPION). The M(H) data were successfully fitted by the Langevin function and magnetic moment,up = 657 tu and diameter d= 8.1 nm were determined. Furthermore, magnetic measurements showed high magnetization at room temperature (M-S =3.98 emu/g), which is desirable for application in spintronics and biomedicine. Core-shell structure of the nanoparticles was used to describe high magnetization of the hematite nanoparticles. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Magnetic properties of hematite (alpha-Fe2O3) nanoparticles prepared by hydrothermal synthesis method
VL  - 320
SP  - 183
EP  - 187
DO  - 10.1016/j.apsusc.2014.08.103
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Damnjanović, Vesna and Milošević, Irena",
year = "2014",
abstract = "Hematite (alpha-Fe2O3) nanoparticles are successfully synthesized by using the hydrothermal synthesis method. An X-ray powder diffraction (XRPD) of the sample shows formation of the nanocrystalline alpha-Fe2O3 phase. A transmission electron microscopy (TEM) measurements show spherical morphology of the hematite nanoparticles and narrow size distribution. An average hematite nanoparticle size is estimated to be about 8 nm by TEM and XRD. Magnetic properties were measured using a superconducting quantum interference device (SQUID) magnetometry. Investigation of the magnetic properties of hematite nanoparticles showed a divergence between field-cooled (FC) and zero-field-cooled (ZFC) magnetization curves below T-irr =103 K (irreversibility temperature). The ZFC magnetization curve showed maximum at T-B = 52 K (blocking temperature). The sample did not exhibit the Morin transition. The M(H) (magnetization versus magnetic field) dependence at 300 K showed properties of superparamagnetic iron oxide nanoparticles (SPION). The M(H) data were successfully fitted by the Langevin function and magnetic moment,up = 657 tu and diameter d= 8.1 nm were determined. Furthermore, magnetic measurements showed high magnetization at room temperature (M-S =3.98 emu/g), which is desirable for application in spintronics and biomedicine. Core-shell structure of the nanoparticles was used to describe high magnetization of the hematite nanoparticles. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Magnetic properties of hematite (alpha-Fe2O3) nanoparticles prepared by hydrothermal synthesis method",
volume = "320",
pages = "183-187",
doi = "10.1016/j.apsusc.2014.08.103"
}

Tadić, M., Panjan, M., Damnjanović, V.,& Milošević, I.. (2014). Magnetic properties of hematite (alpha-Fe2O3) nanoparticles prepared by hydrothermal synthesis method. in Applied Surface Science, 320, 183-187.
https://doi.org/10.1016/j.apsusc.2014.08.103

Tadić M, Panjan M, Damnjanović V, Milošević I. Magnetic properties of hematite (alpha-Fe2O3) nanoparticles prepared by hydrothermal synthesis method. in Applied Surface Science. 2014;320:183-187.
doi:10.1016/j.apsusc.2014.08.103 .

Tadić, Marin, Panjan, Matjaž, Damnjanović, Vesna, Milošević, Irena, "Magnetic properties of hematite (alpha-Fe2O3) nanoparticles prepared by hydrothermal synthesis method" in Applied Surface Science, 320 (2014):183-187,
https://doi.org/10.1016/j.apsusc.2014.08.103 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Salatić, Branislav
AU  - Peruško, Davor
AU  - Panjan, Matjaž
AU  - Čekada, Miha
AU  - Gaković, Biljana M.
AU  - Jelenković, Branislav
AU  - Trtica, Milan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6956
AB  - A study of the effects of laser irradiation on the morphology and structure of Al/Ti and Ni/Ti multilayers is reported in this paper. Multilayers of Al/Ti and Ni/Ti were deposited by dc ion sputtering on Si(100) substrates in a single vacuum run. Laser processing was done by a focused Er, Yb, Cr glass laser beam at a wavelength of 1540 nm, a pulse duration of 40 ns and fluence in the range 8.5-23.8 J cm(-2). Surface changes can be summarized as follows: (i) the intensive removal of surface material with crater-like characteristics, (ii) the appearance of hydrodynamic features (such as resolidified droplets) and (iii) the sporadic appearance of cracking. Changes in the (Ni/Ti)/Si system included modification of the Si substrate with the formation of polygonal-mosaic structures and the appearance of hydrodynamic features in the form of nano-globules. The rate of ablation increased with energy density, whereas the rate of ablation for the (Ni/Ti)/Si system (similar to 11 x 10(3) mu m(3) per pulse) was higher than that for the (Al/Ti)/Si system (similar to 7 x 10(3) mu m(3) per pulse).
T2  - Physica Scripta
T1  - Surface modification of Ti-based nanocomposite multilayer structures by using laser beam irradiation
VL  - T149
DO  - 10.1088/0031-8949/2012/T149/014082
ER  - 

@article{
author = "Petrović, Suzana and Salatić, Branislav and Peruško, Davor and Panjan, Matjaž and Čekada, Miha and Gaković, Biljana M. and Jelenković, Branislav and Trtica, Milan",
year = "2012",
abstract = "A study of the effects of laser irradiation on the morphology and structure of Al/Ti and Ni/Ti multilayers is reported in this paper. Multilayers of Al/Ti and Ni/Ti were deposited by dc ion sputtering on Si(100) substrates in a single vacuum run. Laser processing was done by a focused Er, Yb, Cr glass laser beam at a wavelength of 1540 nm, a pulse duration of 40 ns and fluence in the range 8.5-23.8 J cm(-2). Surface changes can be summarized as follows: (i) the intensive removal of surface material with crater-like characteristics, (ii) the appearance of hydrodynamic features (such as resolidified droplets) and (iii) the sporadic appearance of cracking. Changes in the (Ni/Ti)/Si system included modification of the Si substrate with the formation of polygonal-mosaic structures and the appearance of hydrodynamic features in the form of nano-globules. The rate of ablation increased with energy density, whereas the rate of ablation for the (Ni/Ti)/Si system (similar to 11 x 10(3) mu m(3) per pulse) was higher than that for the (Al/Ti)/Si system (similar to 7 x 10(3) mu m(3) per pulse).",
journal = "Physica Scripta",
title = "Surface modification of Ti-based nanocomposite multilayer structures by using laser beam irradiation",
volume = "T149",
doi = "10.1088/0031-8949/2012/T149/014082"
}

Petrović, S., Salatić, B., Peruško, D., Panjan, M., Čekada, M., Gaković, B. M., Jelenković, B.,& Trtica, M.. (2012). Surface modification of Ti-based nanocomposite multilayer structures by using laser beam irradiation. in Physica Scripta, T149.
https://doi.org/10.1088/0031-8949/2012/T149/014082

Petrović S, Salatić B, Peruško D, Panjan M, Čekada M, Gaković BM, Jelenković B, Trtica M. Surface modification of Ti-based nanocomposite multilayer structures by using laser beam irradiation. in Physica Scripta. 2012;T149.
doi:10.1088/0031-8949/2012/T149/014082 .

Petrović, Suzana, Salatić, Branislav, Peruško, Davor, Panjan, Matjaž, Čekada, Miha, Gaković, Biljana M., Jelenković, Branislav, Trtica, Milan, "Surface modification of Ti-based nanocomposite multilayer structures by using laser beam irradiation" in Physica Scripta, T149 (2012),
https://doi.org/10.1088/0031-8949/2012/T149/014082 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Kovač, Janez
AU  - Panjan, Matjaž
AU  - Gaković, Biljana M.
AU  - Radak, Bojan
AU  - Janković Mandić, Ljiljana
AU  - Trtica, Milan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6993
AB  - Interaction of a Nd:YAG laser, operating at 1064 nm wavelength and pulse duration of 150 ps, with Ni/Ti multilayer thin films was studied. Nanocomposite structure of five (Ni/Ti) bilayers deposited by DC ion sputtering on Si(100) wafers to a total thickness of ca. 180 nm was treated with a laser pulse energy of about 55 mJ without focusing (fluence 1 J cm(-2)), Multi-pulse laser irradiation was done at an incidence angle of 22 degrees in air. The composition and surface morphology were monitored by Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and by atomic force microscopy (AFM). The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the target surface. Besides surface oxidation, the results show an increase in surface roughness, formation of a regularly rippled surface topography and microcracking. Depth profile AES analysis revealed that laser annealing induced intermixing between the components of individual Ni and Ti layers with indications of possible formation of NiTi intermetallic compounds. An interesting finding is the surface segregation of Ti, although the top layer was Ni, prior to laser irradiation. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - Laser treatment of nanocomposite Ni/Ti multilayer thin films in air
VL  - 211
SP  - 93
EP  - 97
DO  - 10.1016/j.surfcoat.2011.07.035
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Kovač, Janez and Panjan, Matjaž and Gaković, Biljana M. and Radak, Bojan and Janković Mandić, Ljiljana and Trtica, Milan",
year = "2012",
abstract = "Interaction of a Nd:YAG laser, operating at 1064 nm wavelength and pulse duration of 150 ps, with Ni/Ti multilayer thin films was studied. Nanocomposite structure of five (Ni/Ti) bilayers deposited by DC ion sputtering on Si(100) wafers to a total thickness of ca. 180 nm was treated with a laser pulse energy of about 55 mJ without focusing (fluence 1 J cm(-2)), Multi-pulse laser irradiation was done at an incidence angle of 22 degrees in air. The composition and surface morphology were monitored by Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and by atomic force microscopy (AFM). The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the target surface. Besides surface oxidation, the results show an increase in surface roughness, formation of a regularly rippled surface topography and microcracking. Depth profile AES analysis revealed that laser annealing induced intermixing between the components of individual Ni and Ti layers with indications of possible formation of NiTi intermetallic compounds. An interesting finding is the surface segregation of Ti, although the top layer was Ni, prior to laser irradiation. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "Laser treatment of nanocomposite Ni/Ti multilayer thin films in air",
volume = "211",
pages = "93-97",
doi = "10.1016/j.surfcoat.2011.07.035"
}

Petrović, S., Peruško, D., Kovač, J., Panjan, M., Gaković, B. M., Radak, B., Janković Mandić, L.,& Trtica, M.. (2012). Laser treatment of nanocomposite Ni/Ti multilayer thin films in air. in Surface and Coatings Technology, 211, 93-97.
https://doi.org/10.1016/j.surfcoat.2011.07.035

Petrović S, Peruško D, Kovač J, Panjan M, Gaković BM, Radak B, Janković Mandić L, Trtica M. Laser treatment of nanocomposite Ni/Ti multilayer thin films in air. in Surface and Coatings Technology. 2012;211:93-97.
doi:10.1016/j.surfcoat.2011.07.035 .

Petrović, Suzana, Peruško, Davor, Kovač, Janez, Panjan, Matjaž, Gaković, Biljana M., Radak, Bojan, Janković Mandić, Ljiljana, Trtica, Milan, "Laser treatment of nanocomposite Ni/Ti multilayer thin films in air" in Surface and Coatings Technology, 211 (2012):93-97,
https://doi.org/10.1016/j.surfcoat.2011.07.035 . .

TY  - JOUR
AU  - Peruško, Davor
AU  - Petrović, Suzana
AU  - Stojanović, Mirjana
AU  - Mitrić, Miodrag
AU  - Cizmovic, M.
AU  - Panjan, Matjaž
AU  - Milosavljević, Momir
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4913
AB  - The effects of Ar+ ion irradiation on Al/Ti multilayers at room temperature were investigated. Eight (Al/Ti) bilayers were deposited by d.c. ion sputtering on (100) Si wafers to a total thickness of similar to 300 nm. Ion irradiations were performed by 180 keV Ar+ ions with doses 1-6 x 10(16) ions cm(-2). After implantation the samples were vacuum annealed at 400 degrees C for 30 min. Ion irradiations induced intermixing of layer constituents. and for the highest fluence formation of AlTi and AlTi3 intermetallic phases in the vicinity of the mid projected range of the impact ions. Subsequent vacuum annealing of sample implanted to 6 x 10(16) ions cm(-2) lead to transformation of all deposited layers into AlTi3 and gamma-AlTi intermetallic phases, except for 3-4 layers close to the substrate which were out of range of the effects induced by ion implantation. It is assumed that Al-Ti reaction was initiated by thermal spikes and further enhanced by chemical driving forces, but only in the intermixed region. This procedure may be interesting for fabrication of Al-Ti intermetallic compounds tightly adhered on different substrates. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Formation of intermetallics by ion implantation of multilatered Al/Ti nano-structures
VL  - 282
SP  - 4
EP  - 7
DO  - 10.1016/j.nimb.2011.08.038
ER  - 

@article{
author = "Peruško, Davor and Petrović, Suzana and Stojanović, Mirjana and Mitrić, Miodrag and Cizmovic, M. and Panjan, Matjaž and Milosavljević, Momir",
year = "2012",
abstract = "The effects of Ar+ ion irradiation on Al/Ti multilayers at room temperature were investigated. Eight (Al/Ti) bilayers were deposited by d.c. ion sputtering on (100) Si wafers to a total thickness of similar to 300 nm. Ion irradiations were performed by 180 keV Ar+ ions with doses 1-6 x 10(16) ions cm(-2). After implantation the samples were vacuum annealed at 400 degrees C for 30 min. Ion irradiations induced intermixing of layer constituents. and for the highest fluence formation of AlTi and AlTi3 intermetallic phases in the vicinity of the mid projected range of the impact ions. Subsequent vacuum annealing of sample implanted to 6 x 10(16) ions cm(-2) lead to transformation of all deposited layers into AlTi3 and gamma-AlTi intermetallic phases, except for 3-4 layers close to the substrate which were out of range of the effects induced by ion implantation. It is assumed that Al-Ti reaction was initiated by thermal spikes and further enhanced by chemical driving forces, but only in the intermixed region. This procedure may be interesting for fabrication of Al-Ti intermetallic compounds tightly adhered on different substrates. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Formation of intermetallics by ion implantation of multilatered Al/Ti nano-structures",
volume = "282",
pages = "4-7",
doi = "10.1016/j.nimb.2011.08.038"
}

Peruško, D., Petrović, S., Stojanović, M., Mitrić, M., Cizmovic, M., Panjan, M.,& Milosavljević, M.. (2012). Formation of intermetallics by ion implantation of multilatered Al/Ti nano-structures. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 282, 4-7.
https://doi.org/10.1016/j.nimb.2011.08.038

Peruško D, Petrović S, Stojanović M, Mitrić M, Cizmovic M, Panjan M, Milosavljević M. Formation of intermetallics by ion implantation of multilatered Al/Ti nano-structures. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2012;282:4-7.
doi:10.1016/j.nimb.2011.08.038 .

Peruško, Davor, Petrović, Suzana, Stojanović, Mirjana, Mitrić, Miodrag, Cizmovic, M., Panjan, Matjaž, Milosavljević, Momir, "Formation of intermetallics by ion implantation of multilatered Al/Ti nano-structures" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 282 (2012):4-7,
https://doi.org/10.1016/j.nimb.2011.08.038 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Kusigerski, Vladan
AU  - Marković, Dragana
AU  - Panjan, Matjaž
AU  - Milošević, Irena
AU  - Spasojević, Vojislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4784
AB  - We report on magnetic properties of iron oxide nanoparticles in a silica matrix synthesized by the sol-gel method. The sample is characterized by using X-ray powder diffractometer (XRPD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and superconducting quantum interference device (SQUID) magnetometer. TEM reveals iron oxide nanoparticles (maghemite/magnetite) of small sizes of about 4 nm, narrow size distribution and no particle agglomeration. The SQUID measurements show low blocking temperature T-B = 6 K and superparamagnetic behavior above 30 K. Obtained saturation magnetization M-S = 61.1 emu/g is very high, among the highest values for iron oxides of particle size below 5 nm. The field-cooled hysteresis measurements do not show displacement of the hysteresis loop thus indicating an absence of exchange bias, whereas AC susceptibility reveals non-interacting nanoparticles. The values of K-eff and K-S (effective and surface anisotropy constants) obtained in this work are smaller than those reported in the literature for systems where shells disorder spin structure (surface effects) is observed. These results point to highly crystalline iron oxide nanoparticles with a low amount of internal defects and small surface disorder shell thickness which is uncommon for nanoparticles of this size. Superparamagnetic iron oxide nanoparticles (SPION) with such properties are convenient for the biomedical applications in targeted diagnostics and drug delivery. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix
VL  - 525
SP  - 28
EP  - 33
DO  - 10.1016/j.jallcom.2012.02.056
ER  - 

@article{
author = "Tadić, Marin and Kusigerski, Vladan and Marković, Dragana and Panjan, Matjaž and Milošević, Irena and Spasojević, Vojislav",
year = "2012",
abstract = "We report on magnetic properties of iron oxide nanoparticles in a silica matrix synthesized by the sol-gel method. The sample is characterized by using X-ray powder diffractometer (XRPD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and superconducting quantum interference device (SQUID) magnetometer. TEM reveals iron oxide nanoparticles (maghemite/magnetite) of small sizes of about 4 nm, narrow size distribution and no particle agglomeration. The SQUID measurements show low blocking temperature T-B = 6 K and superparamagnetic behavior above 30 K. Obtained saturation magnetization M-S = 61.1 emu/g is very high, among the highest values for iron oxides of particle size below 5 nm. The field-cooled hysteresis measurements do not show displacement of the hysteresis loop thus indicating an absence of exchange bias, whereas AC susceptibility reveals non-interacting nanoparticles. The values of K-eff and K-S (effective and surface anisotropy constants) obtained in this work are smaller than those reported in the literature for systems where shells disorder spin structure (surface effects) is observed. These results point to highly crystalline iron oxide nanoparticles with a low amount of internal defects and small surface disorder shell thickness which is uncommon for nanoparticles of this size. Superparamagnetic iron oxide nanoparticles (SPION) with such properties are convenient for the biomedical applications in targeted diagnostics and drug delivery. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix",
volume = "525",
pages = "28-33",
doi = "10.1016/j.jallcom.2012.02.056"
}

Tadić, M., Kusigerski, V., Marković, D., Panjan, M., Milošević, I.,& Spasojević, V.. (2012). Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix. in Journal of Alloys and Compounds, 525, 28-33.
https://doi.org/10.1016/j.jallcom.2012.02.056

Tadić M, Kusigerski V, Marković D, Panjan M, Milošević I, Spasojević V. Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix. in Journal of Alloys and Compounds. 2012;525:28-33.
doi:10.1016/j.jallcom.2012.02.056 .

Tadić, Marin, Kusigerski, Vladan, Marković, Dragana, Panjan, Matjaž, Milošević, Irena, Spasojević, Vojislav, "Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix" in Journal of Alloys and Compounds, 525 (2012):28-33,
https://doi.org/10.1016/j.jallcom.2012.02.056 . .

TY  - JOUR
AU  - Peruško, Davor
AU  - Petrović, Suzana
AU  - Kovač, Janez
AU  - Stojanović, Zoran A.
AU  - Panjan, Matjaž
AU  - Obradović, Marko O.
AU  - Milosavljević, Momir
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4769
AB  - In this study, multilayered structures consisting of eight (Al/Ti) bilayers deposited by d.c. ion sputtering onto Si (100) wafers, to a total thickness of similar to 300 nm were treated in air with a picosecond-pulsed Nd:YAG laser in a defocused regime. Irradiation was done with 200 successive pulses, at 1,064-nm wavelength, energy per pulse 15 mJ, the incidence angle of similar to 45 degrees, covering an area of 2-mm in diameter. The samples were analyzed by scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. It was found that laser irradiation-induced melting and a progressed Al-Ti nanoalloying within the top four bilayers (up to a depth of similar to 150 nm), while the underlying part of the multilayered structure remained intact. Another interesting result is that of a regularly rippled surface topography (similar to 1.4-mu m period and 100-nm amplitude) developed throughout the zone of the melted and reacted material.
T2  - Journal of Materials Science
T1  - Laser-induced formation of intermetallics in multilayered Al/Ti nano-structures
VL  - 47
IS  - 10
SP  - 4488
EP  - 4495
DO  - 10.1007/s10853-012-6311-8
ER  - 

@article{
author = "Peruško, Davor and Petrović, Suzana and Kovač, Janez and Stojanović, Zoran A. and Panjan, Matjaž and Obradović, Marko O. and Milosavljević, Momir",
year = "2012",
abstract = "In this study, multilayered structures consisting of eight (Al/Ti) bilayers deposited by d.c. ion sputtering onto Si (100) wafers, to a total thickness of similar to 300 nm were treated in air with a picosecond-pulsed Nd:YAG laser in a defocused regime. Irradiation was done with 200 successive pulses, at 1,064-nm wavelength, energy per pulse 15 mJ, the incidence angle of similar to 45 degrees, covering an area of 2-mm in diameter. The samples were analyzed by scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. It was found that laser irradiation-induced melting and a progressed Al-Ti nanoalloying within the top four bilayers (up to a depth of similar to 150 nm), while the underlying part of the multilayered structure remained intact. Another interesting result is that of a regularly rippled surface topography (similar to 1.4-mu m period and 100-nm amplitude) developed throughout the zone of the melted and reacted material.",
journal = "Journal of Materials Science",
title = "Laser-induced formation of intermetallics in multilayered Al/Ti nano-structures",
volume = "47",
number = "10",
pages = "4488-4495",
doi = "10.1007/s10853-012-6311-8"
}

Peruško, D., Petrović, S., Kovač, J., Stojanović, Z. A., Panjan, M., Obradović, M. O.,& Milosavljević, M.. (2012). Laser-induced formation of intermetallics in multilayered Al/Ti nano-structures. in Journal of Materials Science, 47(10), 4488-4495.
https://doi.org/10.1007/s10853-012-6311-8

Peruško D, Petrović S, Kovač J, Stojanović ZA, Panjan M, Obradović MO, Milosavljević M. Laser-induced formation of intermetallics in multilayered Al/Ti nano-structures. in Journal of Materials Science. 2012;47(10):4488-4495.
doi:10.1007/s10853-012-6311-8 .

Peruško, Davor, Petrović, Suzana, Kovač, Janez, Stojanović, Zoran A., Panjan, Matjaž, Obradović, Marko O., Milosavljević, Momir, "Laser-induced formation of intermetallics in multilayered Al/Ti nano-structures" in Journal of Materials Science, 47, no. 10 (2012):4488-4495,
https://doi.org/10.1007/s10853-012-6311-8 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Citakovic, Nada
AU  - Panjan, Matjaž
AU  - Stanojević, Boban
AU  - Marković, Dragana
AU  - Jovanović, Đorđe
AU  - Spasojević, Vojislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5168
AB  - We found novel and superior magnetic properties of the hematite (alpha-Fe2O3) that originate from an internal microstructure of particles and strong inter-particle interactions between nanocrystal sub-units. The hematite particles were synthesized by thermal decomposition of iron (III) nitrate without any template or surfactant. The purity, size, crystallinity, morphology, microstructure and magnetic features of the as-prepared particles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), Raman spectroscopy (RS) and SQUID magnetometry. An XRD study reveals a pure phase of alpha-Fe2O3 whereas TEM shows alpha-Fe2O3 spheres with a diameter of about 150 nm. RS also shows high quality and purity of the sample. Moreover, TEM and HRTEM images show a pomegranate-like superstructure and evidence that the spherical particles are composed of individual well-crystallized nanoparticle sub-units (self-assembled nanoparticles) with a size of about 20 nm. Magnetic measurements display hysteretic behavior at the room temperature with remanent magnetization M-r = 0.731 emu/g, saturation magnetization M-S = 6.83 emu/g and coercivity H-C = 4350 Oe, as well as the Morin transition at T-M = 261 K. These results and comparison with those in the literature reveal that the sample has extremely high coercivity. The magnetic properties of the sample are discussed in relation to morphology, internal microstructure, surface effects and exchange and dipole-dipole interactions. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Synthesis, morphology and microstructure of pomegranate-like hematite (alpha-Fe2O3) superstructure with high coercivity
VL  - 543
SP  - 118
EP  - 124
DO  - 10.1016/j.jallcom.2012.07.047
ER  - 

@article{
author = "Tadić, Marin and Citakovic, Nada and Panjan, Matjaž and Stanojević, Boban and Marković, Dragana and Jovanović, Đorđe and Spasojević, Vojislav",
year = "2012",
abstract = "We found novel and superior magnetic properties of the hematite (alpha-Fe2O3) that originate from an internal microstructure of particles and strong inter-particle interactions between nanocrystal sub-units. The hematite particles were synthesized by thermal decomposition of iron (III) nitrate without any template or surfactant. The purity, size, crystallinity, morphology, microstructure and magnetic features of the as-prepared particles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), Raman spectroscopy (RS) and SQUID magnetometry. An XRD study reveals a pure phase of alpha-Fe2O3 whereas TEM shows alpha-Fe2O3 spheres with a diameter of about 150 nm. RS also shows high quality and purity of the sample. Moreover, TEM and HRTEM images show a pomegranate-like superstructure and evidence that the spherical particles are composed of individual well-crystallized nanoparticle sub-units (self-assembled nanoparticles) with a size of about 20 nm. Magnetic measurements display hysteretic behavior at the room temperature with remanent magnetization M-r = 0.731 emu/g, saturation magnetization M-S = 6.83 emu/g and coercivity H-C = 4350 Oe, as well as the Morin transition at T-M = 261 K. These results and comparison with those in the literature reveal that the sample has extremely high coercivity. The magnetic properties of the sample are discussed in relation to morphology, internal microstructure, surface effects and exchange and dipole-dipole interactions. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Synthesis, morphology and microstructure of pomegranate-like hematite (alpha-Fe2O3) superstructure with high coercivity",
volume = "543",
pages = "118-124",
doi = "10.1016/j.jallcom.2012.07.047"
}

Tadić, M., Citakovic, N., Panjan, M., Stanojević, B., Marković, D., Jovanović, Đ.,& Spasojević, V.. (2012). Synthesis, morphology and microstructure of pomegranate-like hematite (alpha-Fe2O3) superstructure with high coercivity. in Journal of Alloys and Compounds, 543, 118-124.
https://doi.org/10.1016/j.jallcom.2012.07.047

Tadić M, Citakovic N, Panjan M, Stanojević B, Marković D, Jovanović Đ, Spasojević V. Synthesis, morphology and microstructure of pomegranate-like hematite (alpha-Fe2O3) superstructure with high coercivity. in Journal of Alloys and Compounds. 2012;543:118-124.
doi:10.1016/j.jallcom.2012.07.047 .

Tadić, Marin, Citakovic, Nada, Panjan, Matjaž, Stanojević, Boban, Marković, Dragana, Jovanović, Đorđe, Spasojević, Vojislav, "Synthesis, morphology and microstructure of pomegranate-like hematite (alpha-Fe2O3) superstructure with high coercivity" in Journal of Alloys and Compounds, 543 (2012):118-124,
https://doi.org/10.1016/j.jallcom.2012.07.047 . .

TY  - CONF
AU  - Petrović, Suzana
AU  - Salatić, Branislav
AU  - Peruško, Davor
AU  - Panjan, Matjaž
AU  - Pantelić, D.
AU  - Gaković, Biljana M.
AU  - Jelenković, Branislav
AU  - Trtica, Milan
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10979
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade
T1  - Surface modification of Ti-based nanocomposite multilayer structures by laser beam irradiation
SP  - 153
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10979
ER  - 

@conference{
author = "Petrović, Suzana and Salatić, Branislav and Peruško, Davor and Panjan, Matjaž and Pantelić, D. and Gaković, Biljana M. and Jelenković, Branislav and Trtica, Milan",
year = "2011",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade",
title = "Surface modification of Ti-based nanocomposite multilayer structures by laser beam irradiation",
pages = "153",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10979"
}

Petrović, S., Salatić, B., Peruško, D., Panjan, M., Pantelić, D., Gaković, B. M., Jelenković, B.,& Trtica, M.. (2011). Surface modification of Ti-based nanocomposite multilayer structures by laser beam irradiation. in PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 153.
https://hdl.handle.net/21.15107/rcub_vinar_10979

Petrović S, Salatić B, Peruško D, Panjan M, Pantelić D, Gaković BM, Jelenković B, Trtica M. Surface modification of Ti-based nanocomposite multilayer structures by laser beam irradiation. in PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade. 2011;:153.
https://hdl.handle.net/21.15107/rcub_vinar_10979 .

Petrović, Suzana, Salatić, Branislav, Peruško, Davor, Panjan, Matjaž, Pantelić, D., Gaković, Biljana M., Jelenković, Branislav, Trtica, Milan, "Surface modification of Ti-based nanocomposite multilayer structures by laser beam irradiation" in PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade (2011):153,
https://hdl.handle.net/21.15107/rcub_vinar_10979 .

TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Marković, D.
AU  - Milošević, Irena
AU  - Spasojević, Vojislav
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4318
AB  - We have observed unusual magnetic properties of NiO (nickel oxide) nanoparticles embedded in a silica matrix. The sample was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) of the sample shows the formation of the nanocrystalline NiO phase whereas transmission electron microscope (TEM) reveals spherical-shaped nanoparticles of about 4 nm diameter. Moreover, HRTEM images show lattice fringes of the nanoparticles and defects in the crystal structure. The temperature and field dependence of the magnetization are also measured. The zero-field-cooled (ZFC) measurements show two maximums, one sharp and narrow at low temperatures similar to 6.5K and an other broad one at higher temperature similar to 64 K. The FC magnetization shows a continuous increase upon lowering the temperature. The M(H) measurements reveal that NiO nanoparticles display anomalous hysteretic behaviors at low temperatures (below the low temperature maximum in the ZFC curve, 2K and 5K) showing that the magnetization initial curve lies below the hysteresis loop for a certain field range. Moreover, jump of the magnetization at low temperatures (2K and 5K) are also observed. These features represent novel magnetic properties for nanosized NiO which may be attributed to the surface spins. Moreover, these results indicate that the NiO nanoparticle consists of magnetically disorder shell and antiferromagnetically order core with an uncompensated magnetic moment. (C) 2011 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix
VL  - 509
IS  - 25
SP  - 7134
EP  - 7138
DO  - 10.1016/j.jallcom.2011.04.032
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Marković, D. and Milošević, Irena and Spasojević, Vojislav",
year = "2011",
abstract = "We have observed unusual magnetic properties of NiO (nickel oxide) nanoparticles embedded in a silica matrix. The sample was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) of the sample shows the formation of the nanocrystalline NiO phase whereas transmission electron microscope (TEM) reveals spherical-shaped nanoparticles of about 4 nm diameter. Moreover, HRTEM images show lattice fringes of the nanoparticles and defects in the crystal structure. The temperature and field dependence of the magnetization are also measured. The zero-field-cooled (ZFC) measurements show two maximums, one sharp and narrow at low temperatures similar to 6.5K and an other broad one at higher temperature similar to 64 K. The FC magnetization shows a continuous increase upon lowering the temperature. The M(H) measurements reveal that NiO nanoparticles display anomalous hysteretic behaviors at low temperatures (below the low temperature maximum in the ZFC curve, 2K and 5K) showing that the magnetization initial curve lies below the hysteresis loop for a certain field range. Moreover, jump of the magnetization at low temperatures (2K and 5K) are also observed. These features represent novel magnetic properties for nanosized NiO which may be attributed to the surface spins. Moreover, these results indicate that the NiO nanoparticle consists of magnetically disorder shell and antiferromagnetically order core with an uncompensated magnetic moment. (C) 2011 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix",
volume = "509",
number = "25",
pages = "7134-7138",
doi = "10.1016/j.jallcom.2011.04.032"
}

Tadić, M., Panjan, M., Marković, D., Milošević, I.,& Spasojević, V.. (2011). Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix. in Journal of Alloys and Compounds, 509(25), 7134-7138.
https://doi.org/10.1016/j.jallcom.2011.04.032

Tadić M, Panjan M, Marković D, Milošević I, Spasojević V. Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix. in Journal of Alloys and Compounds. 2011;509(25):7134-7138.
doi:10.1016/j.jallcom.2011.04.032 .

Tadić, Marin, Panjan, Matjaž, Marković, D., Milošević, Irena, Spasojević, Vojislav, "Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix" in Journal of Alloys and Compounds, 509, no. 25 (2011):7134-7138,
https://doi.org/10.1016/j.jallcom.2011.04.032 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Citakovic, Nada
AU  - Panjan, Matjaž
AU  - Stojanović, Zoran S.
AU  - Marković, Dragana
AU  - Spasojević, Vojislav
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4375
AB  - We report on hydrothermal synthesis, plate-like morphology, microstructure and magnetic properties of hematite (alpha-Fe2O3) plate-like particles. The sample is obtained immediately after the hydrothermal process without using any template and without further heat treatment. The so-obtained sample is characterized by X-ray powder diffraction (XRPD), energy-dispersive X-ray spectroscopy (EDX), field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and superconducting quantum interference device ( SQUID) magnetometer. XRPD confirms the formation of a single-phase hematite sample whereas EDX reveals that iron and oxygen are the only components of the sample. SEM, FE-SEM, TEM and HRTEM show that the sample is composed of plate-like particles. The width of the particles is similar to 500nm whereas thickness is similar to 100 nm ( aspect ratio 5: 1). The HRTEM images exhibit well defined lattice fringes of alpha-Fe2O3 particles that confirm their high crystallinity. Moreover, the HRTEM analysis indicates the plate-like particles preferring crystal growth along [0 1 2] direction. Magnetic measurements display significant hysteretic behavior at room temperature with coercivity H-C = 1140 Oe, remanent magnetization M-r = 0.125 emu/g and saturation magnetization M-S = 2.15 emu/g as well as the Morin transition at TM similar to 250 K. The magnetic properties are discussed with respect to morphology and microstructure of the particles. The results and comparison with urchin-like, rods, spherical, hexagonal, star-like, dendrites, platelets, irregular, nanoplatelets, nanocolumns and nanospheres hematites reveal that the plate-like particles possess good magnetic properties. One may conjecture that the shape anisotropy plays an important role in the magnetic properties of the sample. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles
VL  - 509
IS  - 28
SP  - 7639
EP  - 7644
DO  - 10.1016/j.jallcom.2011.04.117
ER  - 

@article{
author = "Tadić, Marin and Citakovic, Nada and Panjan, Matjaž and Stojanović, Zoran S. and Marković, Dragana and Spasojević, Vojislav",
year = "2011",
abstract = "We report on hydrothermal synthesis, plate-like morphology, microstructure and magnetic properties of hematite (alpha-Fe2O3) plate-like particles. The sample is obtained immediately after the hydrothermal process without using any template and without further heat treatment. The so-obtained sample is characterized by X-ray powder diffraction (XRPD), energy-dispersive X-ray spectroscopy (EDX), field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and superconducting quantum interference device ( SQUID) magnetometer. XRPD confirms the formation of a single-phase hematite sample whereas EDX reveals that iron and oxygen are the only components of the sample. SEM, FE-SEM, TEM and HRTEM show that the sample is composed of plate-like particles. The width of the particles is similar to 500nm whereas thickness is similar to 100 nm ( aspect ratio 5: 1). The HRTEM images exhibit well defined lattice fringes of alpha-Fe2O3 particles that confirm their high crystallinity. Moreover, the HRTEM analysis indicates the plate-like particles preferring crystal growth along [0 1 2] direction. Magnetic measurements display significant hysteretic behavior at room temperature with coercivity H-C = 1140 Oe, remanent magnetization M-r = 0.125 emu/g and saturation magnetization M-S = 2.15 emu/g as well as the Morin transition at TM similar to 250 K. The magnetic properties are discussed with respect to morphology and microstructure of the particles. The results and comparison with urchin-like, rods, spherical, hexagonal, star-like, dendrites, platelets, irregular, nanoplatelets, nanocolumns and nanospheres hematites reveal that the plate-like particles possess good magnetic properties. One may conjecture that the shape anisotropy plays an important role in the magnetic properties of the sample. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles",
volume = "509",
number = "28",
pages = "7639-7644",
doi = "10.1016/j.jallcom.2011.04.117"
}

Tadić, M., Citakovic, N., Panjan, M., Stojanović, Z. S., Marković, D.,& Spasojević, V.. (2011). Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles. in Journal of Alloys and Compounds, 509(28), 7639-7644.
https://doi.org/10.1016/j.jallcom.2011.04.117

Tadić M, Citakovic N, Panjan M, Stojanović ZS, Marković D, Spasojević V. Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles. in Journal of Alloys and Compounds. 2011;509(28):7639-7644.
doi:10.1016/j.jallcom.2011.04.117 .

Tadić, Marin, Citakovic, Nada, Panjan, Matjaž, Stojanović, Zoran S., Marković, Dragana, Spasojević, Vojislav, "Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles" in Journal of Alloys and Compounds, 509, no. 28 (2011):7639-7644,
https://doi.org/10.1016/j.jallcom.2011.04.117 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Marković, Dragana
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4098
AB  - We report on the synthesis, morphology and magnetic properties of a novel NiO/SiO2 nanostructure. The NiO/SiO2 nanostructure was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) showed the formation of the nanocrystalline NiO phase. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) revealed perfectly spherical NiO nanoparticles with diameter of about 5 nm. Amorphous silica shell around the NiO nanoparticles was also observed by HRTEM showing NiO/SiO2 core-shell nanostructure. Magnetic measurements show hysteretic behavior at 2 K with coercivity H-c = 700 Oe, remanent magnetization M-r= 3.9 emu/g, saturation magnetization M-S= 28.2 emu/g and huge magnetic moment m(p) approximate to 1300 mu(B) of the nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Materials Letters
T1  - NiO/SiO2 nanostructure and the magnetic moment of NiO nanoparticles
VL  - 64
IS  - 19
SP  - 2129
EP  - 2131
DO  - 10.1016/j.matlet.2010.07.006
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Marković, Dragana",
year = "2010",
abstract = "We report on the synthesis, morphology and magnetic properties of a novel NiO/SiO2 nanostructure. The NiO/SiO2 nanostructure was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) showed the formation of the nanocrystalline NiO phase. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) revealed perfectly spherical NiO nanoparticles with diameter of about 5 nm. Amorphous silica shell around the NiO nanoparticles was also observed by HRTEM showing NiO/SiO2 core-shell nanostructure. Magnetic measurements show hysteretic behavior at 2 K with coercivity H-c = 700 Oe, remanent magnetization M-r= 3.9 emu/g, saturation magnetization M-S= 28.2 emu/g and huge magnetic moment m(p) approximate to 1300 mu(B) of the nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Materials Letters",
title = "NiO/SiO2 nanostructure and the magnetic moment of NiO nanoparticles",
volume = "64",
number = "19",
pages = "2129-2131",
doi = "10.1016/j.matlet.2010.07.006"
}

Tadić, M., Panjan, M.,& Marković, D.. (2010). NiO/SiO2 nanostructure and the magnetic moment of NiO nanoparticles. in Materials Letters, 64(19), 2129-2131.
https://doi.org/10.1016/j.matlet.2010.07.006

Tadić M, Panjan M, Marković D. NiO/SiO2 nanostructure and the magnetic moment of NiO nanoparticles. in Materials Letters. 2010;64(19):2129-2131.
doi:10.1016/j.matlet.2010.07.006 .

Tadić, Marin, Panjan, Matjaž, Marković, Dragana, "NiO/SiO2 nanostructure and the magnetic moment of NiO nanoparticles" in Materials Letters, 64, no. 19 (2010):2129-2131,
https://doi.org/10.1016/j.matlet.2010.07.006 . .