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Preparation of Fe-50 wt.% Co nanopowders by calcination and hydrogen reduction of nitrate powders
- Issue Date
- Jan-2012
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Fe-50 wt.% Co nanopowders; Calcination of metal-nitrates; Hydrogen reduction; Magnetic properties
- Citation
- MICROELECTRONIC ENGINEERING, v.89, pp.97 - 99
- Indexed
- SCIE
SCOPUS
- Journal Title
- MICROELECTRONIC ENGINEERING
- Volume
- 89
- Start Page
- 97
- End Page
- 99
- ISSN
- 0167-9317
- Abstract
- An optimum route to synthesize Fe-50 wt.% Co nanoparticles and their magnetic properties were investigated. The powder mixture of Fe-oxide and Co(3)O(4) were prepared by calcination of Fe- and Co-nitrate powders. The hydrogen reduction behavior of calcined powders was analyzed by DTA-TG. Thermal analysis revealed that the Fe-oxides and Co(3)O(4) were hydrogen-reduced to Fe-Co alloy particles with an average size of 30 nm in the temperature range of 260-420 degrees C. The powder hydrogen-reduced at 600 degrees C showed saturation magnetization (M(s)) of 204.4 emu/g and coercive force (H(c)) of 96.3 Oe. However, in case of the reduced powder at 350 degrees C, the M(s) and H(c) values are changed to 120.0 emu/g and 826.8 Oe, respectively. The change of magnetic properties was explained by the formation of ferrimagnetic particles. (C) 2011 Elsevier B.V. All rights reserved.
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Related Researcher
- CHOA, YONG HO
- ERICA 공학대학 (DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING)