TY  - JOUR
AU  - Popovic, N.
AU  - Bogdanov, Žarko
AU  - Goncić, Bratislav
AU  - Štrbac, Svetlana
AU  - Rakočević, Zlatko Lj.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3610
AB  - Nickel thin films were deposited on glass substrates at different N-2 gas contents using a dc triode sputtering deposition system. Triode configuration was used to deposit nanostructured thin films with preferred orientation at lower gas pressure and at lower substrate temperature compared to the dc diode sputtering system. A gradual evolution in the composition of the films from Ni, Ni(N), to Ni3N was found by X-ray diffraction analysis. The preferred growth orientation of the nanostructured Ni films changed from (1 1 1) to (1 0 0) for 9% N-2 at 100 degrees C. Ni3N films were formed at 23% N-2 with a particle size of about 65 nm, while for 0% and 9% of nitrogen, the particles sizes were 60 nm, and 37 nm, respectively, as obtained by atomic force microscopy. Magnetic force microscopy imaging showed that the local magnetic structure changed from disordered stripe domains of about 200 nm for Ni and Ni(N) to a structure without a magnetic contrast, indicating the paramagnetic state of this material, which confirmed the structural transformation from Ni to Ni3N. (C) 2008 Elsevier B. V. All rights reserved.
T2  - Applied Surface Science
T1  - Reactively sputtered Ni, Ni(N) and Ni3N films: Structural, electrical and magnetic properties
VL  - 255
IS  - 7
SP  - 4027
EP  - 4032
DO  - 10.1016/j.apsusc.2008.10.076
ER  - 

@article{
author = "Popovic, N. and Bogdanov, Žarko and Goncić, Bratislav and Štrbac, Svetlana and Rakočević, Zlatko Lj.",
year = "2009",
abstract = "Nickel thin films were deposited on glass substrates at different N-2 gas contents using a dc triode sputtering deposition system. Triode configuration was used to deposit nanostructured thin films with preferred orientation at lower gas pressure and at lower substrate temperature compared to the dc diode sputtering system. A gradual evolution in the composition of the films from Ni, Ni(N), to Ni3N was found by X-ray diffraction analysis. The preferred growth orientation of the nanostructured Ni films changed from (1 1 1) to (1 0 0) for 9% N-2 at 100 degrees C. Ni3N films were formed at 23% N-2 with a particle size of about 65 nm, while for 0% and 9% of nitrogen, the particles sizes were 60 nm, and 37 nm, respectively, as obtained by atomic force microscopy. Magnetic force microscopy imaging showed that the local magnetic structure changed from disordered stripe domains of about 200 nm for Ni and Ni(N) to a structure without a magnetic contrast, indicating the paramagnetic state of this material, which confirmed the structural transformation from Ni to Ni3N. (C) 2008 Elsevier B. V. All rights reserved.",
journal = "Applied Surface Science",
title = "Reactively sputtered Ni, Ni(N) and Ni3N films: Structural, electrical and magnetic properties",
volume = "255",
number = "7",
pages = "4027-4032",
doi = "10.1016/j.apsusc.2008.10.076"
}

Popovic, N., Bogdanov, Ž., Goncić, B., Štrbac, S.,& Rakočević, Z. Lj.. (2009). Reactively sputtered Ni, Ni(N) and Ni3N films: Structural, electrical and magnetic properties. in Applied Surface Science, 255(7), 4027-4032.
https://doi.org/10.1016/j.apsusc.2008.10.076

Popovic N, Bogdanov Ž, Goncić B, Štrbac S, Rakočević ZL. Reactively sputtered Ni, Ni(N) and Ni3N films: Structural, electrical and magnetic properties. in Applied Surface Science. 2009;255(7):4027-4032.
doi:10.1016/j.apsusc.2008.10.076 .

Popovic, N., Bogdanov, Žarko, Goncić, Bratislav, Štrbac, Svetlana, Rakočević, Zlatko Lj., "Reactively sputtered Ni, Ni(N) and Ni3N films: Structural, electrical and magnetic properties" in Applied Surface Science, 255, no. 7 (2009):4027-4032,
https://doi.org/10.1016/j.apsusc.2008.10.076 . .

TY  - JOUR
AU  - Vulićević, Lj.
AU  - Ivanović, Nenad
AU  - Popovic, N.
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Mitrić, Miodrag
AU  - Andrić, Velibor
AU  - Babić, Dragan
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3581
AB  - Nano-sized powders of iron oxides have been synthesized electrochemically at temperatures in the range of 295-361 K, and current densities in the range of 200-1000 mA dm(-2). The structure and morphology of the powders were investigated by X-ray diffraction and scanning electron and transmission electron microscopy techniques. Their infrared absorption spectra, specific heat C(p)(T) and magnetic susceptibility chi(T) temperature dependences are also determined. The obtained powders consist of two phases, each possessing distinguished characteristics: the one formed of large plates and the other of whiskers. By appropriate adjustment of the synthesis conditions, it is possible to change features and relative abundances of the two phases, and that way to control morphology and other powder properties. Relaxation and transformation of the phases under external influences was also investigated, and the optimal procedure for preparation and stabilization of iron oxide nano-sized powders with desired characteristics was established.
T2  - Journal of Microscopy, Oxford
T1  - Investigation of properties of electrochemically synthesizediron oxide nano-powders
VL  - 232
IS  - 3
SP  - 629
EP  - 633
DO  - 10.1111/j.1365-2818.2008.02129.x
ER  - 

@article{
author = "Vulićević, Lj. and Ivanović, Nenad and Popovic, N. and Novaković, Mirjana M. and Popović, Maja and Mitrić, Miodrag and Andrić, Velibor and Babić, Dragan",
year = "2008",
abstract = "Nano-sized powders of iron oxides have been synthesized electrochemically at temperatures in the range of 295-361 K, and current densities in the range of 200-1000 mA dm(-2). The structure and morphology of the powders were investigated by X-ray diffraction and scanning electron and transmission electron microscopy techniques. Their infrared absorption spectra, specific heat C(p)(T) and magnetic susceptibility chi(T) temperature dependences are also determined. The obtained powders consist of two phases, each possessing distinguished characteristics: the one formed of large plates and the other of whiskers. By appropriate adjustment of the synthesis conditions, it is possible to change features and relative abundances of the two phases, and that way to control morphology and other powder properties. Relaxation and transformation of the phases under external influences was also investigated, and the optimal procedure for preparation and stabilization of iron oxide nano-sized powders with desired characteristics was established.",
journal = "Journal of Microscopy, Oxford",
title = "Investigation of properties of electrochemically synthesizediron oxide nano-powders",
volume = "232",
number = "3",
pages = "629-633",
doi = "10.1111/j.1365-2818.2008.02129.x"
}

Vulićević, Lj., Ivanović, N., Popovic, N., Novaković, M. M., Popović, M., Mitrić, M., Andrić, V.,& Babić, D.. (2008). Investigation of properties of electrochemically synthesizediron oxide nano-powders. in Journal of Microscopy, Oxford, 232(3), 629-633.
https://doi.org/10.1111/j.1365-2818.2008.02129.x

Vulićević L, Ivanović N, Popovic N, Novaković MM, Popović M, Mitrić M, Andrić V, Babić D. Investigation of properties of electrochemically synthesizediron oxide nano-powders. in Journal of Microscopy, Oxford. 2008;232(3):629-633.
doi:10.1111/j.1365-2818.2008.02129.x .

Vulićević, Lj., Ivanović, Nenad, Popovic, N., Novaković, Mirjana M., Popović, Maja, Mitrić, Miodrag, Andrić, Velibor, Babić, Dragan, "Investigation of properties of electrochemically synthesizediron oxide nano-powders" in Journal of Microscopy, Oxford, 232, no. 3 (2008):629-633,
https://doi.org/10.1111/j.1365-2818.2008.02129.x . .

TY  - JOUR
AU  - Rakočević, Zlatko Lj.
AU  - Popovic, N.
AU  - Bogdanov, Žarko
AU  - Goncić, Bratislav
AU  - Štrbac, Svetlana
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3480
AB  - Nickel was sputter deposited on a glass with a thin film thickness of 600 nm under either in an argon atmosphere or under a partial pressure of nitrogen of either 1.3x10(-4) or 4x10(-4) mbar. Atomic force microscopy and scanning surface potential microscopy (SSPM) were used to study the morphology and to estimate the surface resistivity of the obtained Ni thin films taking into account surface-roughness effects. For the three samples investigated, the surface resistivity values as estimated using SSPM were in good agreement with the results obtained by standard four-point probe measurements. (c) 2008 American Institute of Physics.
T2  - Review of Scientific Instruments
T1  - Surface resistivity estimation by scanning surface potential microscopy
VL  - 79
IS  - 6
DO  - 10.1063/1.2937647
ER  - 

@article{
author = "Rakočević, Zlatko Lj. and Popovic, N. and Bogdanov, Žarko and Goncić, Bratislav and Štrbac, Svetlana",
year = "2008",
abstract = "Nickel was sputter deposited on a glass with a thin film thickness of 600 nm under either in an argon atmosphere or under a partial pressure of nitrogen of either 1.3x10(-4) or 4x10(-4) mbar. Atomic force microscopy and scanning surface potential microscopy (SSPM) were used to study the morphology and to estimate the surface resistivity of the obtained Ni thin films taking into account surface-roughness effects. For the three samples investigated, the surface resistivity values as estimated using SSPM were in good agreement with the results obtained by standard four-point probe measurements. (c) 2008 American Institute of Physics.",
journal = "Review of Scientific Instruments",
title = "Surface resistivity estimation by scanning surface potential microscopy",
volume = "79",
number = "6",
doi = "10.1063/1.2937647"
}

Rakočević, Z. Lj., Popovic, N., Bogdanov, Ž., Goncić, B.,& Štrbac, S.. (2008). Surface resistivity estimation by scanning surface potential microscopy. in Review of Scientific Instruments, 79(6).
https://doi.org/10.1063/1.2937647

Rakočević ZL, Popovic N, Bogdanov Ž, Goncić B, Štrbac S. Surface resistivity estimation by scanning surface potential microscopy. in Review of Scientific Instruments. 2008;79(6).
doi:10.1063/1.2937647 .

Rakočević, Zlatko Lj., Popovic, N., Bogdanov, Žarko, Goncić, Bratislav, Štrbac, Svetlana, "Surface resistivity estimation by scanning surface potential microscopy" in Review of Scientific Instruments, 79, no. 6 (2008),
https://doi.org/10.1063/1.2937647 . .

TY  - CONF
AU  - Vulievic, Lj.
AU  - Ivanović, Nenad
AU  - Popovic, N.
AU  - Kusigerski, Vladan
AU  - Sreckovic, M.
AU  - Tomić, Željka
AU  - Vardic, S.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6691
AB  - The investigated nanometric magnetite powders were synthesized electrochemically, and examined by XRD and SEM techniques. Their reduction was conducted through the isothermal heating in hydrogen in the temperature range from 600 to 860 K. Kinetics of the hydrogen recovery process during oxidation of freshly formed Fe powders in a water vapor stream was also studied. It was assumed that the solid-gas reaction is diffusion controlled, and Janders model was applied to describe it. The experimental data suggest that the reoxidation process proceeds in two stages, at various activation energies. By changing the conditions of the electrochemical (EC) process we were able to produce the iron oxide powders with optimal particle size and activity, for pure hydrogen production through appropriate reduction/oxidation processes.
C3  - Materials Science Forum
T1  - Reduction of nanometric magnetite powder
VL  - 555
SP  - 273
EP  - +
DO  - 10.4028/www.scientific.net/MSF.555.273
ER  - 

@conference{
author = "Vulievic, Lj. and Ivanović, Nenad and Popovic, N. and Kusigerski, Vladan and Sreckovic, M. and Tomić, Željka and Vardic, S.",
year = "2007",
abstract = "The investigated nanometric magnetite powders were synthesized electrochemically, and examined by XRD and SEM techniques. Their reduction was conducted through the isothermal heating in hydrogen in the temperature range from 600 to 860 K. Kinetics of the hydrogen recovery process during oxidation of freshly formed Fe powders in a water vapor stream was also studied. It was assumed that the solid-gas reaction is diffusion controlled, and Janders model was applied to describe it. The experimental data suggest that the reoxidation process proceeds in two stages, at various activation energies. By changing the conditions of the electrochemical (EC) process we were able to produce the iron oxide powders with optimal particle size and activity, for pure hydrogen production through appropriate reduction/oxidation processes.",
journal = "Materials Science Forum",
title = "Reduction of nanometric magnetite powder",
volume = "555",
pages = "273-+",
doi = "10.4028/www.scientific.net/MSF.555.273"
}

Vulievic, Lj., Ivanović, N., Popovic, N., Kusigerski, V., Sreckovic, M., Tomić, Ž.,& Vardic, S.. (2007). Reduction of nanometric magnetite powder. in Materials Science Forum, 555, 273-+.
https://doi.org/10.4028/www.scientific.net/MSF.555.273

Vulievic L, Ivanović N, Popovic N, Kusigerski V, Sreckovic M, Tomić Ž, Vardic S. Reduction of nanometric magnetite powder. in Materials Science Forum. 2007;555:273-+.
doi:10.4028/www.scientific.net/MSF.555.273 .

Vulievic, Lj., Ivanović, Nenad, Popovic, N., Kusigerski, Vladan, Sreckovic, M., Tomić, Željka, Vardic, S., "Reduction of nanometric magnetite powder" in Materials Science Forum, 555 (2007):273-+,
https://doi.org/10.4028/www.scientific.net/MSF.555.273 . .

TY  - CONF
AU  - Bogdanov, Žarko
AU  - Popovic, N.
AU  - Zlatanovic, M.
AU  - Goncić, Bratislav
AU  - Rakočević, Zlatko Lj.
AU  - Zec, Slavica
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6692
AB  - The reactive sputter deposition of TiN thin films onto glass substrate at the ambient temperature using a homemade broad beam argon ion source was investigated in order to deposit the films with nanostructural characteristics. While constant Ar beam energy of 2 keV was used, the N-2 partial pressure and the substrate current, adjusted by different accelerator grid potentials (V-acc) were varied. A negative substrate bias voltage (100 V) was additionally applied. The TiN film structure was investigated by XRD and STM methods. All deposited films exhibited (220) preferred orientation, and the change in normalized peak intensity (I-220/d), lattice spacing (d(220)) and full-with at half-maximum (FWHM) were investigated. As a result of higher energy bombardment with 100 V negative substrate bias, compared to the substrate current change with V-acc, nearly constant (220) peak broadening with the increase of N-2 partial pressure was obtained. The measured grain diameter (STM and XRD) confirms that the grain size is less than 12 nm, and the (220) preferred orientation was disturbed but not destructed.
C3  - Materials Science Forum
T1  - Nano-structured TiN thin films deposited by single ion beam reactive sputtering
VL  - 555
SP  - 303
EP  - +
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6692
ER  - 

@conference{
author = "Bogdanov, Žarko and Popovic, N. and Zlatanovic, M. and Goncić, Bratislav and Rakočević, Zlatko Lj. and Zec, Slavica",
year = "2007",
abstract = "The reactive sputter deposition of TiN thin films onto glass substrate at the ambient temperature using a homemade broad beam argon ion source was investigated in order to deposit the films with nanostructural characteristics. While constant Ar beam energy of 2 keV was used, the N-2 partial pressure and the substrate current, adjusted by different accelerator grid potentials (V-acc) were varied. A negative substrate bias voltage (100 V) was additionally applied. The TiN film structure was investigated by XRD and STM methods. All deposited films exhibited (220) preferred orientation, and the change in normalized peak intensity (I-220/d), lattice spacing (d(220)) and full-with at half-maximum (FWHM) were investigated. As a result of higher energy bombardment with 100 V negative substrate bias, compared to the substrate current change with V-acc, nearly constant (220) peak broadening with the increase of N-2 partial pressure was obtained. The measured grain diameter (STM and XRD) confirms that the grain size is less than 12 nm, and the (220) preferred orientation was disturbed but not destructed.",
journal = "Materials Science Forum",
title = "Nano-structured TiN thin films deposited by single ion beam reactive sputtering",
volume = "555",
pages = "303-+",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6692"
}

Bogdanov, Ž., Popovic, N., Zlatanovic, M., Goncić, B., Rakočević, Z. Lj.,& Zec, S.. (2007). Nano-structured TiN thin films deposited by single ion beam reactive sputtering. in Materials Science Forum, 555, 303-+.
https://hdl.handle.net/21.15107/rcub_vinar_6692

Bogdanov Ž, Popovic N, Zlatanovic M, Goncić B, Rakočević ZL, Zec S. Nano-structured TiN thin films deposited by single ion beam reactive sputtering. in Materials Science Forum. 2007;555:303-+.
https://hdl.handle.net/21.15107/rcub_vinar_6692 .

Bogdanov, Žarko, Popovic, N., Zlatanovic, M., Goncić, Bratislav, Rakočević, Zlatko Lj., Zec, Slavica, "Nano-structured TiN thin films deposited by single ion beam reactive sputtering" in Materials Science Forum, 555 (2007):303-+,
https://hdl.handle.net/21.15107/rcub_vinar_6692 .

TY  - JOUR
AU  - Vulićević, Lj.
AU  - Ivanović, Nenad
AU  - Maricic, A.
AU  - Vučković, Aleksandra
AU  - Popovic, N.
AU  - Vardic, S.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6598
AB  - Structural, magnetic and electrical properties of iron oxide nano-sized powders synthesised electrochemically under various conditions are presented. The influence of the temperature and current density of synthesis on particular powder characteristics is established. Possibilities for co-existence of various phases and their impact on powder properties, as well as feasible paths of phase relaxation and transition during non-isothermal heating are investigated, too. In this way, optimal procedures for the preparation and stabilisation of iron oxides nano-sized powders of different characteristics are evaluated.
T2  - Materials Science Forum
T1  - Structural, magnetic, and electrical characteristics of metastable iron oxide nano-sized powders
VL  - 518
SP  - 113
EP  - 118
DO  - 10.4028/www.scientific.net/MSF.518.113
ER  - 

@article{
author = "Vulićević, Lj. and Ivanović, Nenad and Maricic, A. and Vučković, Aleksandra and Popovic, N. and Vardic, S.",
year = "2006",
abstract = "Structural, magnetic and electrical properties of iron oxide nano-sized powders synthesised electrochemically under various conditions are presented. The influence of the temperature and current density of synthesis on particular powder characteristics is established. Possibilities for co-existence of various phases and their impact on powder properties, as well as feasible paths of phase relaxation and transition during non-isothermal heating are investigated, too. In this way, optimal procedures for the preparation and stabilisation of iron oxides nano-sized powders of different characteristics are evaluated.",
journal = "Materials Science Forum",
title = "Structural, magnetic, and electrical characteristics of metastable iron oxide nano-sized powders",
volume = "518",
pages = "113-118",
doi = "10.4028/www.scientific.net/MSF.518.113"
}

Vulićević, Lj., Ivanović, N., Maricic, A., Vučković, A., Popovic, N.,& Vardic, S.. (2006). Structural, magnetic, and electrical characteristics of metastable iron oxide nano-sized powders. in Materials Science Forum, 518, 113-118.
https://doi.org/10.4028/www.scientific.net/MSF.518.113

Vulićević L, Ivanović N, Maricic A, Vučković A, Popovic N, Vardic S. Structural, magnetic, and electrical characteristics of metastable iron oxide nano-sized powders. in Materials Science Forum. 2006;518:113-118.
doi:10.4028/www.scientific.net/MSF.518.113 .

Vulićević, Lj., Ivanović, Nenad, Maricic, A., Vučković, Aleksandra, Popovic, N., Vardic, S., "Structural, magnetic, and electrical characteristics of metastable iron oxide nano-sized powders" in Materials Science Forum, 518 (2006):113-118,
https://doi.org/10.4028/www.scientific.net/MSF.518.113 . .