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

页码：976 / 986

页数：11

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