Magnetic-field-induced selective retardation of reaction in Mn/Ga diffusion couple

JOURNAL OF ALLOYS AND COMPOUNDS

卷:887

Article

Watanabe, Yumi¹  Kobayashi, Ryota^1,4  Mitsui, Yoshifuru¹  Umetsu, Rie Y.²  Koyama, Keiichi^1,3 

[1] Kagoshima Univ, Grad Sch Sci & Engn, Kagoshima 8900065, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Kagoshima Univ, Res Support Ctr, Inst Res Promot, Kagoshima 8900065, Japan

[4] Shinshu Univ, Res Initiat Supra Mat, Nagano 3808553, Japan

关键词: Liquid-solid reactions;    Diffusion;    High magnetic fields;    Magnetically ordered materials;    Transition metal alloys and compounds;   

DOI  :  10.1016/j.jallcom.2021.161310

来源: Elsevier

【 摘 要 】

In-field heat treatments of a solid-liquid Mn/Ga diffusion couple were conducted at 573 and 673 K with and without a magnetic field of 5 T to investigate magnetic field effects on the phase formation. Formation of the beta-Mn, Mn3Ga, gamma-MnGa, lambda-MnGa, Mn2Ga5, and MnGa4 phases was observed. The obtained results indicated that the reaction and phase growth of lambda-MnGa and Mn2Ga5 proceeded by diffusion-controlled process for both heat treatments at 0 and 5 T. We confirmed that a magnetic field suppressed the phase growth of lambda-MnGa and Mn2Ga5. The parabolic coefficients of the lambda-MnGa and Mn2Ga5 phases were exponentially suppressed by applying magnetic field of 5 T. It is suggested that gain of Zeeman energy of Mn-rich phase played a key role for the magnetic-field-induced suppression of the formation of the lambda-MnGa and Mn2Ga5 phases. (C) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

Free