Synthesis of L1₂-FeNi nanoparticles by nitrogen insertion and topotactic extraction method

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  • Goto S.
    Advanced Research and Innovation Center, DENSO Corporation
  • Kura H.
    Advanced Research and Innovation Center, DENSO Corporation
  • Yanagihara H.
    Department of Applied Physics, University of Tsukuba

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  • Synthesis of <i>L</i>1<sub>2</sub>-FeNi Nanoparticles by Nitrogen Insertion and Topotactic Extraction Method

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<p>  The nitrogen insertion and topotactic extraction (NITE) method was used to explore an unknown metastable phase of an FeNi alloy with an Fe:Ni ratio of 1:1. We found that partly ordered non-equilibrium L12-FeNi can be obtained through Fe2Ni2N as the intermediate nitride phase. The experimental results of both x-ray diffraction and transmission electron microscopy with energy dispersive x-ray spectrometry are consistent in identifying the denitrided material as L12-FeNi. Ni atoms preferentially occupy the corner sites in an estimated 96% of cases. No significant difference was found in the magnetization curves between the precursor of A1-FeNi and L12-FeNi particles. Our results suggest that the NITE method is not only a useful way for synthesizing fully ordered alloys of equilibrium phases such as L10-FeNi but also for creating metastable phases like L12-FeNi.</p>

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