Phase equilibria and magnetic properties of Heusler-type ordered phases in the Co-Mn-Ga ternary system

被引：18

作者：

Minakuchi, K. ^{[1
]}

Umetsu, R. Y. ^{[2
,3
]}

Kobayashi, K. ^{[1
]}

Nagasako, M. ^{[2
]}

Kainuma, R. ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

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

[3] Japan Sci & Technol Agcy, Precursory Res Embryon Sci & Technol JST PRESTO, Saitama 3320012, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 645卷

基金：

日本学术振兴会;

关键词：

Phase equilibria; Order-disorder transition; Magnetic moment; Curie temperature; RICH PORTION; FE; AL; 1ST-PRINCIPLES; STABILITY; ALLOYS; CR;

D O I：

10.1016/j.jallcom.2015.04.200

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phase equilibria at 800, 900 and 1000 degrees C, as well as order-disorder and magnetic transitions of Heusler-type ordered phase were investigated in the Co-Mn-Ga ternary system. The beta phase with bcc structure including the Heusler-type ordered phase exists in a wide composition range of the ternary system. It was confirmed by STEM-HAADF observation that the crystal structure of the Heusler-type ordered alloy Mn2CoGa is L2(1b)-type Fm (3) over barm (i.e., (Mn,Co)(2)MnGa), but not inverse-Heusler (Hg2CuTi) type F (4) over bar 3m. The L2(1)/B2 order-disorder transition temperature shows a maximum at the stoichiometric composition of Co2MnGa and the Curie temperature of the L2(1) phase decreases with increasing Ga content. Magnetic moments converted from magnetization curves at 4.2 K for CoxMn(76-x)Ga24 alloys well follow the generalized Slater-Pauling rule in the composition of 25 <= x <= 50, and magnetization curves indicate very small high-field magnetic susceptibility. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：577 / 585

页数：9

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