Synthesis of single-phase L10-FeNi magnet powder by nitrogen insertion and topotactic extraction

Sho Goto, Hiroaki Kura, Eiji Watanabe, Yasushi Hayashi, Hideto Yanagihara, Yusuke Shimada, Masaki Mizuguchi, Koki Takanashi, Eiji Kita

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39 Citations (Scopus)


Tetrataenite (L10-FeNi) is a promising candidate for use as a permanent magnet free of rare-earth elements because of its favorable properties. In this study, single-phase L10-FeNi powder with a high degree of order was synthesized through a new method, nitrogen insertion and topotactic extraction (NITE). In the method, FeNiN, which has the same ordered arrangement as L10-FeNi, is formed by nitriding A1-FeNi powder with ammonia gas. Subsequently, FeNiN is denitrided by topotactic reaction to derive single-phase L10-FeNi with an order parameter of 0.71. The transformation of disordered-phase FeNi into the L10 phase increased the coercive force from 14.5 kA/m to 142 kA/m. The proposed method not only significantly accelerates the development of magnets using L10-FeNi but also offers a new synthesis route to obtain ordered alloys in non-equilibrium states.

Original languageEnglish
Article number13216
JournalScientific reports
Issue number1
Publication statusPublished - 2017 Dec 1

ASJC Scopus subject areas

  • General

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