Microstructural properties of electrochemically prepared Ni-Fe-W powders
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2012
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A nanostructured Ni-Fe-W powder was obtained by electrodeposition from ammonium citrate electrolyte within the current density range of 500-1000 mA cm(-2) at the electrolyte temperature of 50 degrees C -70 degrees C. XRD analysis shows that the powder contains an amorphous matrix having embedded nanocrystals of the FCC solid solution of iron and tungsten in nickel, with an average crystal grain size of 3.4 nm, a high internal microstrain value and a high density of chaotically distributed dislocations. EDS analysis exhibits that the chemical composition of the Ni-24%Fe-11%W powder does not depend upon current density and electrolyte temperature due to the diffusion control of the process of code-position of nickel, iron and tungsten. SEM micrographs show that the electrodeposition results in the formation of two particle shapes: large cauliflower-like particles and small dendrite particles. The cauliflower-like particles contain deep cavities at hydrogen evolution sites. Cavity density... increases with increasing deposition current density. Smaller powder particles are formed at higher temperatures and at higher current densities. During the first heating, relative magnetic permeability decreases reaching the Curie temperature at about 350 degrees C and after cooling exhibits a 12% increase due to the performed relaxation process. Following the second heating to 500 degrees C, the magnetic permeability of the powder is about 5% lower than that of the as-prepared powder due to crystallization of the amorphous phase of the powder and the crystal grain growth in FCC phase.
Ključne reči:
Nanostructures / Electrochemical deposition / Energy dispersive analysis of X-rays (EDS) / Thermomagnetic effectsIzvor:
Materials Chemistry and Physics, 2012, 135, 1, 212-219Izdavač:
- Elsevier Science Sa, Lausanne
Finansiranje / projekti:
- Usmerena sinteza, struktura i svojstva multifunkcionalnih materijala (RS-MESTD-Basic Research (BR or ON)-172057)
DOI: 10.1016/j.matchemphys.2012.04.061
ISSN: 0254-0584
WoS: 000306034500032
Scopus: 2-s2.0-84861845201
Institucija/grupa
Poljoprivredni fakultetTY - JOUR AU - Ribić-Zelenović, L. AU - Cirović, N. AU - Spasojević, M. AU - Mitrović, N. AU - Maricić, A. AU - Pavlović, Vladimir PY - 2012 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/2958 AB - A nanostructured Ni-Fe-W powder was obtained by electrodeposition from ammonium citrate electrolyte within the current density range of 500-1000 mA cm(-2) at the electrolyte temperature of 50 degrees C -70 degrees C. XRD analysis shows that the powder contains an amorphous matrix having embedded nanocrystals of the FCC solid solution of iron and tungsten in nickel, with an average crystal grain size of 3.4 nm, a high internal microstrain value and a high density of chaotically distributed dislocations. EDS analysis exhibits that the chemical composition of the Ni-24%Fe-11%W powder does not depend upon current density and electrolyte temperature due to the diffusion control of the process of code-position of nickel, iron and tungsten. SEM micrographs show that the electrodeposition results in the formation of two particle shapes: large cauliflower-like particles and small dendrite particles. The cauliflower-like particles contain deep cavities at hydrogen evolution sites. Cavity density increases with increasing deposition current density. Smaller powder particles are formed at higher temperatures and at higher current densities. During the first heating, relative magnetic permeability decreases reaching the Curie temperature at about 350 degrees C and after cooling exhibits a 12% increase due to the performed relaxation process. Following the second heating to 500 degrees C, the magnetic permeability of the powder is about 5% lower than that of the as-prepared powder due to crystallization of the amorphous phase of the powder and the crystal grain growth in FCC phase. PB - Elsevier Science Sa, Lausanne T2 - Materials Chemistry and Physics T1 - Microstructural properties of electrochemically prepared Ni-Fe-W powders EP - 219 IS - 1 SP - 212 VL - 135 DO - 10.1016/j.matchemphys.2012.04.061 ER -
@article{ author = "Ribić-Zelenović, L. and Cirović, N. and Spasojević, M. and Mitrović, N. and Maricić, A. and Pavlović, Vladimir", year = "2012", abstract = "A nanostructured Ni-Fe-W powder was obtained by electrodeposition from ammonium citrate electrolyte within the current density range of 500-1000 mA cm(-2) at the electrolyte temperature of 50 degrees C -70 degrees C. XRD analysis shows that the powder contains an amorphous matrix having embedded nanocrystals of the FCC solid solution of iron and tungsten in nickel, with an average crystal grain size of 3.4 nm, a high internal microstrain value and a high density of chaotically distributed dislocations. EDS analysis exhibits that the chemical composition of the Ni-24%Fe-11%W powder does not depend upon current density and electrolyte temperature due to the diffusion control of the process of code-position of nickel, iron and tungsten. SEM micrographs show that the electrodeposition results in the formation of two particle shapes: large cauliflower-like particles and small dendrite particles. The cauliflower-like particles contain deep cavities at hydrogen evolution sites. Cavity density increases with increasing deposition current density. Smaller powder particles are formed at higher temperatures and at higher current densities. During the first heating, relative magnetic permeability decreases reaching the Curie temperature at about 350 degrees C and after cooling exhibits a 12% increase due to the performed relaxation process. Following the second heating to 500 degrees C, the magnetic permeability of the powder is about 5% lower than that of the as-prepared powder due to crystallization of the amorphous phase of the powder and the crystal grain growth in FCC phase.", publisher = "Elsevier Science Sa, Lausanne", journal = "Materials Chemistry and Physics", title = "Microstructural properties of electrochemically prepared Ni-Fe-W powders", pages = "219-212", number = "1", volume = "135", doi = "10.1016/j.matchemphys.2012.04.061" }
Ribić-Zelenović, L., Cirović, N., Spasojević, M., Mitrović, N., Maricić, A.,& Pavlović, V.. (2012). Microstructural properties of electrochemically prepared Ni-Fe-W powders. in Materials Chemistry and Physics Elsevier Science Sa, Lausanne., 135(1), 212-219. https://doi.org/10.1016/j.matchemphys.2012.04.061
Ribić-Zelenović L, Cirović N, Spasojević M, Mitrović N, Maricić A, Pavlović V. Microstructural properties of electrochemically prepared Ni-Fe-W powders. in Materials Chemistry and Physics. 2012;135(1):212-219. doi:10.1016/j.matchemphys.2012.04.061 .
Ribić-Zelenović, L., Cirović, N., Spasojević, M., Mitrović, N., Maricić, A., Pavlović, Vladimir, "Microstructural properties of electrochemically prepared Ni-Fe-W powders" in Materials Chemistry and Physics, 135, no. 1 (2012):212-219, https://doi.org/10.1016/j.matchemphys.2012.04.061 . .