Phase equilibria in the CdAs2-Cd3As2-MnAs ternary system

被引：12
|
作者：
Ril, A. I. [1 ]
Fedorchenko, I. V. [1 ,2 ]
Marenkin, S. F. [1 ,2 ]
Kochura, A. V. [3 ]
Kuz'ko, A. E. [3 ]
机构：
[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Leninskii Pr 31, Moscow 119991, Russia
[2] Natl Res & Technol Univ MISiS, Leninskii Pr 4, Moscow 119991, Russia
[3] South Western State Univ, Ul 50 Let Oktyabrya 94, Kursk 305040, Russia
来源：
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2017年 / 62卷 / 07期
基金：
俄罗斯基础研究基金会;
关键词：
ELECTRONIC-STRUCTURE; MANGANESE ARSENIDE; MAGNETORESISTANCE; SEMICONDUCTORS; FILMS;
D O I：
10.1134/S0036023617070191
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
We determined, using a set of physicochemical methods, including X-ray powder diffraction (XRD), differential thermal analysis, and microstructure studies, that the CdAs2-Cd3As2-MnAs ternary system is bounded by three eutectic-type quasi-binary sections: Cd3As2-MnAs, CdAs2-MnAs, and Cd3As2-CdAs2. For Cd3As2-MnAs and CdAs2-MnAs sections, the eutectic coordinates are, respectively, 75 mol % Cd3As2 + 25 mol % MnAs, T (m.eut) = 604A degrees C; and 92 mol % CdAs2 + 8 mol % MnAs, T (m.eut) = 608A degrees C. These are rod eutectics. Manganese solubilities in Cd3As2 and CdAs2 phases are insignificant and, according to XRD and SEM, they do not exceed 1 at %. The binary eutectics of the quasi-binary sections form ternary eutectic Cd3As2 + CdAs2 + MnAs, whose average composition as probed by SEM is 34.5 at % Cd, 63 at % Cd and 2.5 at % As and T (m.eut) = 600A degrees C. Cadmium and manganese arsenide alloys are ferromagnets with the Curie point at 320 K. The magnetic and electric properties are due to ferromagnetic MnAs microinclusions.
引用
收藏
页码：976 / 986
页数：11
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