Abstract

Phase equilibria in the MnSe–Ga₂Se₃ system were re-investigated by differential thermal analysis (DTA) and X-ray powder diffraction (XRD), and a phase diagram was constructed, somewhat differing from that presented earlier in the literature. We found that the system featured the formation of an intermediate phase (γ) with a wide (47–61 mol % Ga₂Se₃) homogeneity extent. Extensive (~30 mol %) Ga₂Se₃-base solid solutions were also found. The γ phase undergoes γ′ ↔ γ polymorphic transformation at 1183–1193 K, the temperature depending on the composition. The γ′ high-temperature phase has a minimum melting point at 1205 K and 55 mol % Ga₂Se₃, and it is in peritectic equilibrium with terminal solid solutions. The tetragonal lattice parameters of the γ phase containing 50 and 60 mol % Ga₂Se₃ were determined based on X-ray powder diffraction data. The previously indicated ternary compound Mn₂Ga₂Se₅ was not confirmed to exist. A comparative analysis of the results against the related literature was carried out.

中文翻译：

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MnSe-Ga2Se3 系统的修订相图

摘要

通过差热分析（​​DTA）和X射线粉末衍射（XRD）重新研究了MnSe-Ga ₂ Se ₃体系中的相平衡，并构建了相图，与之前文献中提出的有所不同。我们发现该体系形成了具有较宽（47-61 mol% Ga ₂ Se ₃）均匀程度的中间相（γ）。还发现了广泛的（~30 mol%）Ga ₂ Se ₃基固溶体。γ 相在 1183–1193 K 温度下发生 γ′ ↔ γ 多晶型转变，该温度取决于成分。γ'高温相的最低熔点为1205 K，Ga ₂ Se ₃含量为55 mol% ，与末端固溶体处于包晶平衡。基于X射线粉末衍射数据确定含有50mol％和60mol％Ga ₂ Se _{3的γ相的四方晶格参数。}未证实先前指出的三元化合物Mn ₂ Ga ₂ Se _{5的存在。}将结果与相关文献进行对比分析。