TY  - JOUR
AU  - Spasojević, Milica
AU  - Marković, Dušan
AU  - Spasojević, Miroslav
AU  - Vuković, Zoran
AU  - Maričić, Aleksa
AU  - Ribić-Zelenović, Lenka
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3325
AB  - Ni-Fe-W-Cu alloy powders were obtained by electrodeposition from an ammonium citrate bath at current densities ranging between 70 and 600 mA cm-2. As the deposition current density increased, the contents of Fe and W in the alloy increased, and those of Ni and Cu decreased. The total cathodic polarization curve was recorded, and partial polarization curves for Ni, Fe and W deposition and hydrogen evolution were determined. The current efficiency of alloy deposition was measured. The powders contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. At high current densities, small-sized nanocrystals exhibiting high internal microstrain values were formed. Powder particles were dendrite-and cauliflower-shaped. The dendrites had a large number of secondary branches and higher-order branches containing interconnected globules. The density of branches was higher in particles formed at high current densities. The powders formed at high current densities exhibited higher magnetization. Annealing at temperatures up to 460 °C resulted in structural relaxation, accompanied by an increase in magnetization. At temperatures above 460 °C, amorphous matrix crystallization and FCC crystal growth took place, accompanied by a decrease in magnetization.
T2  - Science of Sintering
T1  - Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys
VL  - 51
IS  - 2
SP  - 1
EP  - 13
DO  - 10.2298/SOS1902209S
ER  - 

@article{
author = "Spasojević, Milica and Marković, Dušan and Spasojević, Miroslav and Vuković, Zoran and Maričić, Aleksa and Ribić-Zelenović, Lenka",
year = "2019",
abstract = "Ni-Fe-W-Cu alloy powders were obtained by electrodeposition from an ammonium citrate bath at current densities ranging between 70 and 600 mA cm-2. As the deposition current density increased, the contents of Fe and W in the alloy increased, and those of Ni and Cu decreased. The total cathodic polarization curve was recorded, and partial polarization curves for Ni, Fe and W deposition and hydrogen evolution were determined. The current efficiency of alloy deposition was measured. The powders contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. At high current densities, small-sized nanocrystals exhibiting high internal microstrain values were formed. Powder particles were dendrite-and cauliflower-shaped. The dendrites had a large number of secondary branches and higher-order branches containing interconnected globules. The density of branches was higher in particles formed at high current densities. The powders formed at high current densities exhibited higher magnetization. Annealing at temperatures up to 460 °C resulted in structural relaxation, accompanied by an increase in magnetization. At temperatures above 460 °C, amorphous matrix crystallization and FCC crystal growth took place, accompanied by a decrease in magnetization.",
journal = "Science of Sintering",
title = "Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys",
volume = "51",
number = "2",
pages = "1-13",
doi = "10.2298/SOS1902209S"
}

Spasojević, M., Marković, D., Spasojević, M., Vuković, Z., Maričić, A.,& Ribić-Zelenović, L.. (2019). Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys. in Science of Sintering, 51(2), 1-13.
https://doi.org/10.2298/SOS1902209S

Spasojević M, Marković D, Spasojević M, Vuković Z, Maričić A, Ribić-Zelenović L. Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys. in Science of Sintering. 2019;51(2):1-13.
doi:10.2298/SOS1902209S .

Spasojević, Milica, Marković, Dušan, Spasojević, Miroslav, Vuković, Zoran, Maričić, Aleksa, Ribić-Zelenović, Lenka, "Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys" in Science of Sintering, 51, no. 2 (2019):1-13,
https://doi.org/10.2298/SOS1902209S . .

TY  - JOUR
AU  - Spasojević, Miroslav
AU  - Marković, Dušan
AU  - Trišović, Tomislav Lj.
AU  - Spasojević, Milica
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2137
AB  - The effect of chromium(VI) on the kinetics of disproportionation of hypochlorous acid and hypochlorite was established in the solution for the electrolytic production of chlorate. The hexavalent chromium species Cr2O72-, HCrO4- and CrO42- present in the solution catalyze the disproportionation reaction. In both the absence and presence of chromium(VI), disproportionation is a third-order reaction with respect to HClO and ClO-, and a first-order reaction with respect to the hexavalent chromium species. In the presence of chromium(VI) ions, four parallel reactions probably take place in the solution i.e. uncatalyzed disproportionation and three parallel reactions catalyzed by Cr2O72-, HCrO4- and CrO42- ions. Most likely, the hexavalent chromium species do not change the sequence of elementary reactions in the disproportionation mechanism but only speed up the rate-determining step through interaction with its reactants. In the chlorate production process, as chromium(VI) concentration increases, the optimum pH which ensures the maximum rate of disproportionation is shifted to an acid environment. This is due to an increase in the concentration of the catalytically most active species HCrO4-with increasing acidity of the solution. A mathematical model of the kinetics of the chromium(VI)-catalyzed disproportionation of hypochlorite and hypochlorous acid into chlorate was set up. Good agreement was obtained between theoretical and experimental data. (c) 2018 The Electrochemical Society.
PB  - Electrochemical Soc Inc, Pennington
T2  - Journal of the Electrochemical Society
T1  - Mathematical Model of the Catalytic Effect of Chromium(VI) on Hypochlorite Disproportionation in Chlorate Electrolysis
VL  - 165
IS  - 2
DO  - 10.1149/2.0291802jes
ER  - 

@article{
author = "Spasojević, Miroslav and Marković, Dušan and Trišović, Tomislav Lj. and Spasojević, Milica",
year = "2018",
abstract = "The effect of chromium(VI) on the kinetics of disproportionation of hypochlorous acid and hypochlorite was established in the solution for the electrolytic production of chlorate. The hexavalent chromium species Cr2O72-, HCrO4- and CrO42- present in the solution catalyze the disproportionation reaction. In both the absence and presence of chromium(VI), disproportionation is a third-order reaction with respect to HClO and ClO-, and a first-order reaction with respect to the hexavalent chromium species. In the presence of chromium(VI) ions, four parallel reactions probably take place in the solution i.e. uncatalyzed disproportionation and three parallel reactions catalyzed by Cr2O72-, HCrO4- and CrO42- ions. Most likely, the hexavalent chromium species do not change the sequence of elementary reactions in the disproportionation mechanism but only speed up the rate-determining step through interaction with its reactants. In the chlorate production process, as chromium(VI) concentration increases, the optimum pH which ensures the maximum rate of disproportionation is shifted to an acid environment. This is due to an increase in the concentration of the catalytically most active species HCrO4-with increasing acidity of the solution. A mathematical model of the kinetics of the chromium(VI)-catalyzed disproportionation of hypochlorite and hypochlorous acid into chlorate was set up. Good agreement was obtained between theoretical and experimental data. (c) 2018 The Electrochemical Society.",
publisher = "Electrochemical Soc Inc, Pennington",
journal = "Journal of the Electrochemical Society",
title = "Mathematical Model of the Catalytic Effect of Chromium(VI) on Hypochlorite Disproportionation in Chlorate Electrolysis",
volume = "165",
number = "2",
doi = "10.1149/2.0291802jes"
}

Spasojević, M., Marković, D., Trišović, T. Lj.,& Spasojević, M.. (2018). Mathematical Model of the Catalytic Effect of Chromium(VI) on Hypochlorite Disproportionation in Chlorate Electrolysis. in Journal of the Electrochemical Society
Electrochemical Soc Inc, Pennington., 165(2).
https://doi.org/10.1149/2.0291802jes

Spasojević M, Marković D, Trišović TL, Spasojević M. Mathematical Model of the Catalytic Effect of Chromium(VI) on Hypochlorite Disproportionation in Chlorate Electrolysis. in Journal of the Electrochemical Society. 2018;165(2).
doi:10.1149/2.0291802jes .

Spasojević, Miroslav, Marković, Dušan, Trišović, Tomislav Lj., Spasojević, Milica, "Mathematical Model of the Catalytic Effect of Chromium(VI) on Hypochlorite Disproportionation in Chlorate Electrolysis" in Journal of the Electrochemical Society, 165, no. 2 (2018),
https://doi.org/10.1149/2.0291802jes . .

TY  - JOUR
AU  - Spasojević, Miroslav
AU  - Spasojević, Milica
AU  - Mašković, Pavle
AU  - Marković, Dušan
AU  - Ribić-Zelenović, Lenka
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2200
AB  - Powders of Ni-Co alloys containing small amounts of Cu were produced by electrodeposition from an ammonium bath. Cathodic polarization curves were recorded and partial current densities for alloy deposition and hydrogen evolution were determined. At a current density of 100 mA cm(-2), the electrodeposition process resulted in Ni79.1Co18.6Cu2.3 powder with an average grain size of 6.8 nm, composed of an amorphous matrix and FCC nanocrystals. The deposition of Cu with Ni and Co led to a higher proportion of the amorphous phase, smaller nanocrystals and smaller powder particles in the electrodeposit than in the alloy without copper. During annealing at temperatures ranging from 25 degrees C to 160 degrees C, no structural changes occurred in the powder. Upon structural relaxation in the temperature range of 160-350 degrees C, the powders cooled at 25 degrees C showed greater magnetic permeability. At temperatures between 350 degrees C and 430 degrees C, the amorphous phase exhibiting relatively lower magnetization underwent crystallization, accompanied by the formation of small-sized FCC nanocrystals, which had relatively higher magnetization values, leading to an increase in the magnetic permeability of the cooled powder. At temperatures above 430 degrees C, the formation of large crystalline grains at the expense of small ones caused a decrease in magnetization. (C) 2018 The Electrochemical Society.
PB  - Electrochemical Soc Inc, Pennington
T2  - Journal of the Electrochemical Society
T1  - Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders
VL  - 165
IS  - 11
DO  - 10.1149/2.0441811jes
ER  - 

@article{
author = "Spasojević, Miroslav and Spasojević, Milica and Mašković, Pavle and Marković, Dušan and Ribić-Zelenović, Lenka",
year = "2018",
abstract = "Powders of Ni-Co alloys containing small amounts of Cu were produced by electrodeposition from an ammonium bath. Cathodic polarization curves were recorded and partial current densities for alloy deposition and hydrogen evolution were determined. At a current density of 100 mA cm(-2), the electrodeposition process resulted in Ni79.1Co18.6Cu2.3 powder with an average grain size of 6.8 nm, composed of an amorphous matrix and FCC nanocrystals. The deposition of Cu with Ni and Co led to a higher proportion of the amorphous phase, smaller nanocrystals and smaller powder particles in the electrodeposit than in the alloy without copper. During annealing at temperatures ranging from 25 degrees C to 160 degrees C, no structural changes occurred in the powder. Upon structural relaxation in the temperature range of 160-350 degrees C, the powders cooled at 25 degrees C showed greater magnetic permeability. At temperatures between 350 degrees C and 430 degrees C, the amorphous phase exhibiting relatively lower magnetization underwent crystallization, accompanied by the formation of small-sized FCC nanocrystals, which had relatively higher magnetization values, leading to an increase in the magnetic permeability of the cooled powder. At temperatures above 430 degrees C, the formation of large crystalline grains at the expense of small ones caused a decrease in magnetization. (C) 2018 The Electrochemical Society.",
publisher = "Electrochemical Soc Inc, Pennington",
journal = "Journal of the Electrochemical Society",
title = "Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders",
volume = "165",
number = "11",
doi = "10.1149/2.0441811jes"
}

Spasojević, M., Spasojević, M., Mašković, P., Marković, D.,& Ribić-Zelenović, L.. (2018). Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders. in Journal of the Electrochemical Society
Electrochemical Soc Inc, Pennington., 165(11).
https://doi.org/10.1149/2.0441811jes

Spasojević M, Spasojević M, Mašković P, Marković D, Ribić-Zelenović L. Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders. in Journal of the Electrochemical Society. 2018;165(11).
doi:10.1149/2.0441811jes .

Spasojević, Miroslav, Spasojević, Milica, Mašković, Pavle, Marković, Dušan, Ribić-Zelenović, Lenka, "Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders" in Journal of the Electrochemical Society, 165, no. 11 (2018),
https://doi.org/10.1149/2.0441811jes . .