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
收藏
页码：577 / 585
页数：9
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