Abstract

Phase equilibria in the Cu₂Se–Cu₈SiSe₆–Cu₈GeSe₆ area of the Cu₂Se–SiSe₂–GeSe₂ system have been studied using differential thermal analysis (DTA), X-ray powder diffraction analysis (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDX). The results served to plot a Т–х diagram of the Cu₈SiSe₆–Cu₈GeSe₆ boundary system, a series of polythermal sections, and a 300-K isothermal section of the phase diagram and a liquidus surface projection for the title system. The primary crystallization and homogeneity fields of phases, and the characters and temperatures of invariant and monovariant equilibria have been determined. In the Cu₈SiSe₆–Cu₈GeSe₆ boundary system, continuous solid solutions have been found to exist between the high-temperature phases of the terminal compounds and extensive homogeneity area based on their low-temperature phases were found. The crystal lattice types and unit cell parameters have been determined for the terminal compounds and both phases of solid solutions using X-ray powder diffraction data. The prepared phases of variable composition are of interest as environmentally friendly functional materials.

中文翻译：

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Cu2Se–Cu8SiSe6–Cu8GeSe6 体系中的相平衡

 抽象的

Cu ₂ Se–Cu ₈ SiSe ₆ –Cu ₈ GeSe ₆ 区域的相平衡Cu ₂ Se-SiSe ₂ –GeSe ₂ 体系通过差热分析 (DTA)、X 射线粉末衍射分析 (XRD)、扫描电子显微镜（SEM）和能量色散光谱（EDX）。结果绘制了 Cu ₈ SiSe ₆ –Cu ₈ GeSe ₆ 边界系统的 Т–х 图，一系列多温截面、相图的 300-K 等温截面以及标题系统的液相线表面投影。确定了相的初次结晶和均匀场，以及不变和单变量平衡的特征和温度。在 Cu ₈ SiSe ₆ –Cu ₈ GeSe ₆ 边界体系中，发现高边界层之间存在连续固溶体。发现了末端化合物的温度相和基于其低温相的广泛均匀区域。使用 X 射线粉末衍射数据确定了末端化合物和固溶体两相的晶格类型和晶胞参数。所制备的不同组成的相作为环境友好的功能材料而受到关注。