Effect of hydrogen reduction temperature on the microstructure and magnetic properties of Fe-Ni powders
- Authors
- Oh, Sung-Tag; Choa, Yong-Ho; Kim, Ki Hyeon; Lee, Sang-Kwan; Chang, Si-Young
- Issue Date
- Nov-2010
- Publisher
- Springer Verlag
- Keywords
- Fe-Ni powders; Hydrogen reduction; Powder synthesis; Microstructure; Magnetic properties
- Citation
- Research on Chemical Intermediates, v.36, no.6-7, pp.851 - 857
- Indexed
- SCIE
SCOPUS
- Journal Title
- Research on Chemical Intermediates
- Volume
- 36
- Number
- 6-7
- Start Page
- 851
- End Page
- 857
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/39417
- DOI
- 10.1007/s11164-010-0192-8
- ISSN
- 0922-6168
- Abstract
- The effect of hydrogen reduction temperature on the properties of Fe-Ni powders was described. The mixed powders of Fe-oxide and NiO were prepared by chemical solution mixing of nitrates powders and calcination at 350 A degrees C for 2 h in air. The calcined powders formed small agglomeration with an average particle size of 100 nm. The microstructure and magnetic properties were investigated by using X-ray diffractometry, thermogravimetry, differential thermal analyzer, and vibrating sample magnetometer. Microstructure and thermal analysis revealed that the Fe-oxide and NiO phase were changed to FeNi(3) phase in the temperature range of 245-310 A degrees C, and by heat-up to 690 A degrees C the FeNi(3) phase was transformed to gamma-FeNi phase. The reduced powder at 350 A degrees C showed saturation magnetization of 76.3 emu/g and coercivity of 205.5 Oe, while the reduced powders at 690 A degrees C exhibited saturation magnetization of 84.0 emu/g and coercivity of 14.0 Oe. The change of magnetic properties was discussed by the observed microstructural features.
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