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Magnetic properties of metastable bcc phase in Fe64Ni36 alloy synthesized through polyol process

Authors
  • Jacob, G. Antilen1
  • Sellaiyan, S.2
  • Uedono, A.2
  • Joseyphus, R. Justin1
  • 1 National Institute of Technology, Tiruchirappalli, 620 015, India , Tiruchirappalli (India)
  • 2 University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan , Tsukuba (Japan)
Type
Published Article
Journal
Applied Physics A
Publisher
Springer-Verlag
Publication Date
Jan 21, 2020
Volume
126
Issue
2
Identifiers
DOI: 10.1007/s00339-020-3292-3
Source
Springer Nature
Keywords
License
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Abstract

The equilibrium FeNi alloy exhibits the bcc phase in a narrow composition less than 5 at.% Ni. Fe64Ni36 was obtained through instant chemical reduction employing polyol process and compared with Fe5Ni95 alloy. X-ray diffraction revealed bcc and fcc phases for the Fe-rich and Ni-rich FeNi compositions, respectively. The metastable bcc FeNi transformed to the fcc phase on annealing at 700 °C, whereas the Ni-rich alloy retained its fcc phase. Electron microscopic examination revealed spherical morphology for Fe64Ni36 alloy with an average size of 72 nm compared with flake-like morphology for the Fe5Ni95. The thermomagnetic analysis revealed a Curie temperature of 567 and 359 °C for the as-synthesized Fe and Ni-rich phases, respectively. An increase in Curie temperature by 30 °C was observed in both the compositions on annealing. Room temperature hysteresis loop measurements showed a saturation magnetization of 117 emu/g for bcc Fe64Ni36 alloy which increased to 165 emu/g for the fcc Fe64Ni36. The reaction kinetics involved in polyol process has enabled us to synthesis and investigate the magnetic properties of metastable bcc phase in the Fe64Ni36 composition.

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