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Phase equilibria in the CdAs2–Cd3As2–MnAs ternary system

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Abstract

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 = 604°C; and 92 mol % CdAs2 + 8 mol % MnAs, T m.eut = 608°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 = 600°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.

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Correspondence to S. F. Marenkin.

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Original Russian Text © A.I. Ril, I.V. Fedorchenko, S.F. Marenkin, A.V. Kochura, A.E. Kuz’ko, 2017, published in Zhurnal Neorganicheskoi Khimii, 2017, Vol. 62, No. 7, pp. 977–987.

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Ril, A.I., Fedorchenko, I.V., Marenkin, S.F. et al. Phase equilibria in the CdAs2–Cd3As2–MnAs ternary system. Russ. J. Inorg. Chem. 62, 976–986 (2017). https://doi.org/10.1134/S0036023617070191

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