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Effect of hydrogen reduction temperature on the microstructure and magnetic properties of Fe–Ni powders

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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 °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 FeNi3 phase in the temperature range of 245–310 °C, and by heat-up to 690 °C the FeNi3 phase was transformed to γ-FeNi phase. The reduced powder at 350 °C showed saturation magnetization of 76.3 emu/g and coercivity of 205.5 Oe, while the reduced powders at 690 °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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Acknowledgments

This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul, 139-743, Korea

    Sung-Tag Oh

  2. Department of Chemical Engineering, Hanyang University, Gyeonggi, 426-791, Korea

    Yong-Ho Choa

  3. Department of Physics, Yeungnam University, Gyeongbuk, 712-749, Korea

    Ki Hyeon Kim

  4. Composite Materials Research Group, Korea Institute of Materials Science, Gyeongnam, 641-010, Korea

    Sang-Kwan Lee

  5. Department of Materials Engineering, Korea Aerospace University, Gyeonggi, 412-791, Korea

    Si-Young Chang

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  1. Sung-Tag Oh
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  2. Yong-Ho Choa
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Correspondence to Sung-Tag Oh.

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Oh, ST., Choa, YH., Kim, K.H. et al. Effect of hydrogen reduction temperature on the microstructure and magnetic properties of Fe–Ni powders. Res Chem Intermed 36, 851–857 (2010). https://doi.org/10.1007/s11164-010-0192-8

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  • DOI: https://doi.org/10.1007/s11164-010-0192-8

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