TY  - JOUR
AU  - Tadić, Marin
AU  - Milošević, Irena
AU  - Kralj, Slavko
AU  - Hanžel, Darko
AU  - Barudžija, Tanja
AU  - Motte, Laurence
AU  - Makovec, Darko
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8824
AB  - A metastable ε-polymorph of iron(III) oxide (ε-Fe2O3) is a very attractive material from the technological, engineering, and scientific points of view. In comparison with other iron oxides, it is characterized by unusual magnetic properties and a giant coercivity of ~20 kOe, which is the largest value among metal oxides. The routine method of ε-Fe2O3 formation is based on the thermal annealing of maghemite (γ-Fe2O3) nanoparticles confined in a silica matrix where the ε-Fe2O3 appears as an intermediate phase between the maghemite and an α-polymorph (α-Fe2O3) hematite (γ→ε→α pathway). In this study, it is demonstrated that the ε→α transformation can be reversed when hematite nanoparticles with an anisotropic hollow morphology are annealed above 600 °C. The observed reversal of the phase stability is explained in terms of an increased nanoparticle surface area and surface energy related to the hollow structure. This study demonstrates the applicability of surface-induced phase transformation to stabilize and control ε-Fe2O3 nanostructures with anisotropic shape and high coercivity ~1600 kA/m that is one of the key properties of functional magnetic materials for information processing and storage. The understanding of ε-Fe2O3 formation mechanism can provide a new viewpoint and guidance for designing metastable polymorphs and applicative properties. © 2020 Acta Materialia Inc.
T2  - Acta Materialia
T1  - Surface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivity
VL  - 188
SP  - 16
EP  - 22
DO  - 10.1016/j.actamat.2020.01.058
ER  - 

@article{
author = "Tadić, Marin and Milošević, Irena and Kralj, Slavko and Hanžel, Darko and Barudžija, Tanja and Motte, Laurence and Makovec, Darko",
year = "2020",
abstract = "A metastable ε-polymorph of iron(III) oxide (ε-Fe2O3) is a very attractive material from the technological, engineering, and scientific points of view. In comparison with other iron oxides, it is characterized by unusual magnetic properties and a giant coercivity of ~20 kOe, which is the largest value among metal oxides. The routine method of ε-Fe2O3 formation is based on the thermal annealing of maghemite (γ-Fe2O3) nanoparticles confined in a silica matrix where the ε-Fe2O3 appears as an intermediate phase between the maghemite and an α-polymorph (α-Fe2O3) hematite (γ→ε→α pathway). In this study, it is demonstrated that the ε→α transformation can be reversed when hematite nanoparticles with an anisotropic hollow morphology are annealed above 600 °C. The observed reversal of the phase stability is explained in terms of an increased nanoparticle surface area and surface energy related to the hollow structure. This study demonstrates the applicability of surface-induced phase transformation to stabilize and control ε-Fe2O3 nanostructures with anisotropic shape and high coercivity ~1600 kA/m that is one of the key properties of functional magnetic materials for information processing and storage. The understanding of ε-Fe2O3 formation mechanism can provide a new viewpoint and guidance for designing metastable polymorphs and applicative properties. © 2020 Acta Materialia Inc.",
journal = "Acta Materialia",
title = "Surface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivity",
volume = "188",
pages = "16-22",
doi = "10.1016/j.actamat.2020.01.058"
}

Tadić, M., Milošević, I., Kralj, S., Hanžel, D., Barudžija, T., Motte, L.,& Makovec, D.. (2020). Surface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivity. in Acta Materialia, 188, 16-22.
https://doi.org/10.1016/j.actamat.2020.01.058

Tadić M, Milošević I, Kralj S, Hanžel D, Barudžija T, Motte L, Makovec D. Surface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivity. in Acta Materialia. 2020;188:16-22.
doi:10.1016/j.actamat.2020.01.058 .

Tadić, Marin, Milošević, Irena, Kralj, Slavko, Hanžel, Darko, Barudžija, Tanja, Motte, Laurence, Makovec, Darko, "Surface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivity" in Acta Materialia, 188 (2020):16-22,
https://doi.org/10.1016/j.actamat.2020.01.058 . .

TY  - JOUR
AU  - Ndioukane, Rémi
AU  - Touré, Moussa
AU  - Kobor, Diouma
AU  - Lalatonne, Yoann
AU  - Motte, Laurence
AU  - Lebrun, Laurent
AU  - Tadić, Marin
AU  - Wilhelm, Fabrice
PY  - 2019
UR  - http://stacks.iop.org/0295-5075/125/i=4/a=47004?key=crossref.48239a40f1584f88e0b245c5ffbf4d74
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8219
AB  - In this work we show the size-dependent ferromagnetic behavior of undoped and Mndoped PZN-4.5PT single crystals, consequently their multiferroic one Undoped single crystals were tamisized and three different sizes powders were investigated showing a size dependence in such ferroelectric materials while no magnetism is observed for the non-oriented and oriented bulk single crystals. The results show the existence of an optimized grain sizes range (45 μm . D . 63 μm) in which the magnetism is the highest (around 0.08 emu/g). It is found that the maximum value of the relative strain decreases from 0.25% for undoped crystals to 0.20% for Mn-doped ones. The remanent magnetization Mr and coercivity (Hc) were found equal, respectively, to 2×10-4 emu/g and 63 Oe for undoped and, 7×10-4 emu/g and 66 Oe for Mn-doped PZN-4.5PT, indicating that PZN-4.5PT particles possessed weak ferromagnetic behavior. Mn doping increases highly the spontaneous magnetization from 7.5 × 10-3 emu/g to 1.0×10-3 emu/g, respectively for undoped and Mn-doped nanoparticles. © 2019 EPLA.
T2  - Europhysics Letters / EPL
T1  - Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles
VL  - 125
IS  - 4
SP  - 47004
DO  - 10.1209/0295-5075/125/47004
ER  - 

@article{
author = "Ndioukane, Rémi and Touré, Moussa and Kobor, Diouma and Lalatonne, Yoann and Motte, Laurence and Lebrun, Laurent and Tadić, Marin and Wilhelm, Fabrice",
year = "2019",
abstract = "In this work we show the size-dependent ferromagnetic behavior of undoped and Mndoped PZN-4.5PT single crystals, consequently their multiferroic one Undoped single crystals were tamisized and three different sizes powders were investigated showing a size dependence in such ferroelectric materials while no magnetism is observed for the non-oriented and oriented bulk single crystals. The results show the existence of an optimized grain sizes range (45 μm . D . 63 μm) in which the magnetism is the highest (around 0.08 emu/g). It is found that the maximum value of the relative strain decreases from 0.25% for undoped crystals to 0.20% for Mn-doped ones. The remanent magnetization Mr and coercivity (Hc) were found equal, respectively, to 2×10-4 emu/g and 63 Oe for undoped and, 7×10-4 emu/g and 66 Oe for Mn-doped PZN-4.5PT, indicating that PZN-4.5PT particles possessed weak ferromagnetic behavior. Mn doping increases highly the spontaneous magnetization from 7.5 × 10-3 emu/g to 1.0×10-3 emu/g, respectively for undoped and Mn-doped nanoparticles. © 2019 EPLA.",
journal = "Europhysics Letters / EPL",
title = "Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles",
volume = "125",
number = "4",
pages = "47004",
doi = "10.1209/0295-5075/125/47004"
}

Ndioukane, R., Touré, M., Kobor, D., Lalatonne, Y., Motte, L., Lebrun, L., Tadić, M.,& Wilhelm, F.. (2019). Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles. in Europhysics Letters / EPL, 125(4), 47004.
https://doi.org/10.1209/0295-5075/125/47004

Ndioukane R, Touré M, Kobor D, Lalatonne Y, Motte L, Lebrun L, Tadić M, Wilhelm F. Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles. in Europhysics Letters / EPL. 2019;125(4):47004.
doi:10.1209/0295-5075/125/47004 .

Ndioukane, Rémi, Touré, Moussa, Kobor, Diouma, Lalatonne, Yoann, Motte, Laurence, Lebrun, Laurent, Tadić, Marin, Wilhelm, Fabrice, "Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles" in Europhysics Letters / EPL, 125, no. 4 (2019):47004,
https://doi.org/10.1209/0295-5075/125/47004 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Kralj, Slavko
AU  - Lalatonne, Yoann
AU  - Motte, Laurence
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0169433219301138
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8033
AB  - Investigation and synthesis of anisotropic magnetic nanostructures, such as wires, rods, fibers, tubes and chains, is an important field of research due to the beneficial properties and great potential for practical applications ranging from magnetic data storage to biomedicine. Silica coated iron oxide nanochains of length up to 1 μm and diameter ∼80–100 nm have been synthesized by the simultaneous magnetic assembly of superparamagnetic iron oxide nanoparticle clusters (SNCs) as links (viz. maghemite, γ-Fe2O3) and the fixation of the assembled SNCs with an additional layer of deposited silica. We reveal that is possible to achieve either superparamagnetic or ferromagnetic behavior with the nanochains depending only on their physical orientation. The superparamagnetic behavior is observed for random orientation of nanochains whereas ferromagnetic properties (HC ≈ 100 Oe) come to the fore when the orientation is mainly parallel. These peculiar magnetic properties can be related to: (1) the specific size, which is ∼9 nm, of primary building blocks of the nanochains, i.e. of maghemite nanoparticles; (2) to the anisotropic chain-like shape of the particles; and (3) to inter-particle interactions. Large pore volume and pore size of silica shell as well as good colloidal stability and magnetic responsiveness of such nanochains enable applications in biomedicine. © 2019 Elsevier B.V.
T2  - Applied Surface Science
T1  - Iron oxide nanochains coated with silica: Synthesis, surface effects and magnetic properties
VL  - 476
SP  - 641
EP  - 646
DO  - 10.1016/j.apsusc.2019.01.098
ER  - 

@article{
author = "Tadić, Marin and Kralj, Slavko and Lalatonne, Yoann and Motte, Laurence",
year = "2019",
abstract = "Investigation and synthesis of anisotropic magnetic nanostructures, such as wires, rods, fibers, tubes and chains, is an important field of research due to the beneficial properties and great potential for practical applications ranging from magnetic data storage to biomedicine. Silica coated iron oxide nanochains of length up to 1 μm and diameter ∼80–100 nm have been synthesized by the simultaneous magnetic assembly of superparamagnetic iron oxide nanoparticle clusters (SNCs) as links (viz. maghemite, γ-Fe2O3) and the fixation of the assembled SNCs with an additional layer of deposited silica. We reveal that is possible to achieve either superparamagnetic or ferromagnetic behavior with the nanochains depending only on their physical orientation. The superparamagnetic behavior is observed for random orientation of nanochains whereas ferromagnetic properties (HC ≈ 100 Oe) come to the fore when the orientation is mainly parallel. These peculiar magnetic properties can be related to: (1) the specific size, which is ∼9 nm, of primary building blocks of the nanochains, i.e. of maghemite nanoparticles; (2) to the anisotropic chain-like shape of the particles; and (3) to inter-particle interactions. Large pore volume and pore size of silica shell as well as good colloidal stability and magnetic responsiveness of such nanochains enable applications in biomedicine. © 2019 Elsevier B.V.",
journal = "Applied Surface Science",
title = "Iron oxide nanochains coated with silica: Synthesis, surface effects and magnetic properties",
volume = "476",
pages = "641-646",
doi = "10.1016/j.apsusc.2019.01.098"
}

Tadić, M., Kralj, S., Lalatonne, Y.,& Motte, L.. (2019). Iron oxide nanochains coated with silica: Synthesis, surface effects and magnetic properties. in Applied Surface Science, 476, 641-646.
https://doi.org/10.1016/j.apsusc.2019.01.098

Tadić M, Kralj S, Lalatonne Y, Motte L. Iron oxide nanochains coated with silica: Synthesis, surface effects and magnetic properties. in Applied Surface Science. 2019;476:641-646.
doi:10.1016/j.apsusc.2019.01.098 .

Tadić, Marin, Kralj, Slavko, Lalatonne, Yoann, Motte, Laurence, "Iron oxide nanochains coated with silica: Synthesis, surface effects and magnetic properties" in Applied Surface Science, 476 (2019):641-646,
https://doi.org/10.1016/j.apsusc.2019.01.098 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Milošević, Irena
AU  - Kralj, Slavko
AU  - Mitrić, Miodrag
AU  - Makovec, Darko
AU  - Saboungi, Marie-Louise
AU  - Motte, Laurence
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1662
AB  - We present a simple preparation route to obtain a nanoscale meta-stable hard-magnetic epsilon-Fe2O3 phase, using silica coated beta-FeOOH nanorods as a precursor and an annealing process. The synthesized epsilon-Fe2O3 nanoparticles exhibit large coercivity (H-C similar to 20 kOe at 300 K and H-C similar to 1.6 kOe at 400 K), confirming their high potential for practical applications.
T2  - Nanoscale
T1  - Synthesis of metastable hard-magnetic epsilon-Fe2O3 nanoparticles from silica-coated akaganeite nanorods
VL  - 9
IS  - 30
SP  - 10579
EP  - 10584
DO  - 10.1039/c7nr03639f
ER  - 

@article{
author = "Tadić, Marin and Milošević, Irena and Kralj, Slavko and Mitrić, Miodrag and Makovec, Darko and Saboungi, Marie-Louise and Motte, Laurence",
year = "2017",
abstract = "We present a simple preparation route to obtain a nanoscale meta-stable hard-magnetic epsilon-Fe2O3 phase, using silica coated beta-FeOOH nanorods as a precursor and an annealing process. The synthesized epsilon-Fe2O3 nanoparticles exhibit large coercivity (H-C similar to 20 kOe at 300 K and H-C similar to 1.6 kOe at 400 K), confirming their high potential for practical applications.",
journal = "Nanoscale",
title = "Synthesis of metastable hard-magnetic epsilon-Fe2O3 nanoparticles from silica-coated akaganeite nanorods",
volume = "9",
number = "30",
pages = "10579-10584",
doi = "10.1039/c7nr03639f"
}

Tadić, M., Milošević, I., Kralj, S., Mitrić, M., Makovec, D., Saboungi, M.,& Motte, L.. (2017). Synthesis of metastable hard-magnetic epsilon-Fe2O3 nanoparticles from silica-coated akaganeite nanorods. in Nanoscale, 9(30), 10579-10584.
https://doi.org/10.1039/c7nr03639f

Tadić M, Milošević I, Kralj S, Mitrić M, Makovec D, Saboungi M, Motte L. Synthesis of metastable hard-magnetic epsilon-Fe2O3 nanoparticles from silica-coated akaganeite nanorods. in Nanoscale. 2017;9(30):10579-10584.
doi:10.1039/c7nr03639f .

Tadić, Marin, Milošević, Irena, Kralj, Slavko, Mitrić, Miodrag, Makovec, Darko, Saboungi, Marie-Louise, Motte, Laurence, "Synthesis of metastable hard-magnetic epsilon-Fe2O3 nanoparticles from silica-coated akaganeite nanorods" in Nanoscale, 9, no. 30 (2017):10579-10584,
https://doi.org/10.1039/c7nr03639f . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Milošević, Irena
AU  - Kralj, Slavko
AU  - Mbodji, Mamadou
AU  - Motte, Laurence
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/622
AB  - We report on structural and magnetic properties of uniform silica-coated akaganeite nanorods with length of L similar to 80 +/- 15 nm and diameter D similar to 15 +/- 5 nm as well as silica shell thickness of about 5 nm. Unexpected negative difference between field-cooled (FC) and zero-field-cooled (ZFC) magnetization Delta M = M-FC - M-ZFC LT 0, room temperature ferromagnetism, and exchange bias effect have been found. The nanorods are investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) measurements. The magnetic measurements were also performed on bare akaganeite nanorods in order to discriminate the effects of silica coating on the magnetic properties. The measured coercivity and exchange bias effect of bare beta-FeOOH nanorods are much lower compared with same properties of SiO2"beta-FeOOH nanorods, emphasizing the effect of silica coating on the magnetic properties. These results are discussed considering the core shell structure of akaganeite nanorods; i.e., the inner part of the akaganeite nanorod has antiferromagnetic ordering, whereas the nanorod surface exhibits some disorder spin state.
T2  - Journal of Physical Chemistry. C
T1  - Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties
VL  - 119
IS  - 24
SP  - 13868
EP  - 13875
DO  - 10.1021/acs.jpcc.5b01547
ER  - 

@article{
author = "Tadić, Marin and Milošević, Irena and Kralj, Slavko and Mbodji, Mamadou and Motte, Laurence",
year = "2015",
abstract = "We report on structural and magnetic properties of uniform silica-coated akaganeite nanorods with length of L similar to 80 +/- 15 nm and diameter D similar to 15 +/- 5 nm as well as silica shell thickness of about 5 nm. Unexpected negative difference between field-cooled (FC) and zero-field-cooled (ZFC) magnetization Delta M = M-FC - M-ZFC LT 0, room temperature ferromagnetism, and exchange bias effect have been found. The nanorods are investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) measurements. The magnetic measurements were also performed on bare akaganeite nanorods in order to discriminate the effects of silica coating on the magnetic properties. The measured coercivity and exchange bias effect of bare beta-FeOOH nanorods are much lower compared with same properties of SiO2"beta-FeOOH nanorods, emphasizing the effect of silica coating on the magnetic properties. These results are discussed considering the core shell structure of akaganeite nanorods; i.e., the inner part of the akaganeite nanorod has antiferromagnetic ordering, whereas the nanorod surface exhibits some disorder spin state.",
journal = "Journal of Physical Chemistry. C",
title = "Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties",
volume = "119",
number = "24",
pages = "13868-13875",
doi = "10.1021/acs.jpcc.5b01547"
}

Tadić, M., Milošević, I., Kralj, S., Mbodji, M.,& Motte, L.. (2015). Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties. in Journal of Physical Chemistry. C, 119(24), 13868-13875.
https://doi.org/10.1021/acs.jpcc.5b01547

Tadić M, Milošević I, Kralj S, Mbodji M, Motte L. Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties. in Journal of Physical Chemistry. C. 2015;119(24):13868-13875.
doi:10.1021/acs.jpcc.5b01547 .

Tadić, Marin, Milošević, Irena, Kralj, Slavko, Mbodji, Mamadou, Motte, Laurence, "Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties" in Journal of Physical Chemistry. C, 119, no. 24 (2015):13868-13875,
https://doi.org/10.1021/acs.jpcc.5b01547 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Milošević, Irena
AU  - Kralj, Slavko
AU  - Saboungi, Marie-Louise
AU  - Motte, Laurence
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/532
AB  - We report ferromagnetic-like properties and exchange bias effect in akaganeite (beta-FeOOH) nanorods. They exhibit a Neel temperature T-N = 259 K and ferromagnetic-like hysteresis behavior both below and above T-N. An exchange bias effect is observed below T-N and represents an interesting behavior for akaganeite nanorods. These results are explained on the basis of a core-shell structure in which the core has bulk akaganeite magnetic properties (i.e., antiferromagnetic ordering) while the shell exhibits a disordered spin state. Thus, the nanorods show ferromagnetic properties and an exchange bias effect at the same time, increasing their potential for use in practical applications. (c) 2015 AIP Publishing LLC.
T2  - Applied Physics Letters
T1  - Ferromagnetic behavior and exchange bias effect in akaganeite nanorods
VL  - 106
IS  - 18
DO  - 10.1063/1.4918930
ER  - 

@article{
author = "Tadić, Marin and Milošević, Irena and Kralj, Slavko and Saboungi, Marie-Louise and Motte, Laurence",
year = "2015",
abstract = "We report ferromagnetic-like properties and exchange bias effect in akaganeite (beta-FeOOH) nanorods. They exhibit a Neel temperature T-N = 259 K and ferromagnetic-like hysteresis behavior both below and above T-N. An exchange bias effect is observed below T-N and represents an interesting behavior for akaganeite nanorods. These results are explained on the basis of a core-shell structure in which the core has bulk akaganeite magnetic properties (i.e., antiferromagnetic ordering) while the shell exhibits a disordered spin state. Thus, the nanorods show ferromagnetic properties and an exchange bias effect at the same time, increasing their potential for use in practical applications. (c) 2015 AIP Publishing LLC.",
journal = "Applied Physics Letters",
title = "Ferromagnetic behavior and exchange bias effect in akaganeite nanorods",
volume = "106",
number = "18",
doi = "10.1063/1.4918930"
}

Tadić, M., Milošević, I., Kralj, S., Saboungi, M.,& Motte, L.. (2015). Ferromagnetic behavior and exchange bias effect in akaganeite nanorods. in Applied Physics Letters, 106(18).
https://doi.org/10.1063/1.4918930

Tadić M, Milošević I, Kralj S, Saboungi M, Motte L. Ferromagnetic behavior and exchange bias effect in akaganeite nanorods. in Applied Physics Letters. 2015;106(18).
doi:10.1063/1.4918930 .

Tadić, Marin, Milošević, Irena, Kralj, Slavko, Saboungi, Marie-Louise, Motte, Laurence, "Ferromagnetic behavior and exchange bias effect in akaganeite nanorods" in Applied Physics Letters, 106, no. 18 (2015),
https://doi.org/10.1063/1.4918930 . .