Abstract

The phase formation in the sections Ag₂Se–Cu₂SnSe₃ and Ag₈SnSe₆–Cu₂SnSe₃ of the quasi-ternary system Ag₂Se–SnSe₂–Cu₂Sе was studied for the first time by differential thermal analysis (with thermodynamic calculations), X-ray powder diffraction analysis, and microstructural analysis and also by microhardness and density measurements. No new quaternary compounds were detected. It was determined that both sections are quasi-binary and are of simple eutectic type with limited solubility based on the initial selenides. The coordinates of the eutectic points are (40 mol % Ag₂Se, 910 K) and (50 mol % Ag₈SnSe₆, 780 K). The solubility based on Cu₂SnSe₃ was 10 mol % Ag₂Se in the system Ag₂Se–Cu₂SnSe₃ and 15 mol % Ag₈SnSe₆ in the system Ag₈SnSe₆–Cu₂SnSe₃. Single crystals of the compound Cu₂SnSe₃ and the solid solutions (Cu₂SnSe₃)_{1 – х}(Ag₈SnSe₆)_х (х = 0.02–0.15) were grown by the Bridgman–Stockbarger directional crystallization method. It was found that these solutions crystallize in the monoclinic system, and the unit cell parameters increase with increasing Ag₈SnSe₆ content: а = 6.968–6.985 Å, b = 12.051–12.078 Å, с = 6.945–6.968 Å, β = 109.20°–109.30°, space group Сс, Z = 4, and ρ = 5.75–5.86 g/cm³.

中文翻译：

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Ag 2 Se–Cu 2 SnSe 3和Ag 8 SnSe 6 –Cu 2 SnSe 3系统中的相平衡

摘要

相形成在所述部分的Ag ₂硒铜₂位SnSe ₃和Ag ₈位SnSe ₆ -Cu ₂位SnSe ₃的准三元体系的Ag ₂硒位SnSe ₂ -Cu ₂ Sе通过差热分析研究首次（通过热力学计算），X射线粉末衍射分析，显微组织分析以及显微硬度和密度测量。没有检测到新的季化合物。已经确定这两个部分都是准二元的，并且是基于初始硒化物的有限溶解度的简单共晶类型。共晶点的坐标为（40 mol％Ag₂ SE，910 K）和（50摩尔％的Ag ₈位SnSe ₆，780 K）。基于Cu ₂ SnSe ₃的溶解度在Ag ₂ Se–Cu ₂ SnSe ₃系统中为10 mol％Ag ₂ Se，在Ag ₈ SnSe ₆ –Cu ₂ SnSe ₃系统中为15 mol％Ag ₈ SnSe ₆。该化合物的Cu单晶₂位SnSe ₃和固体溶液（铜₂位SnSe ₃）_{1 - х}（AG ₈位SnSe ₆）通过Bridgman–Stockbarger定向结晶法生长了_х（ х = 0.02–0.15）。发现这些溶液在单斜晶系统中结晶，并且晶胞参数随Ag ₈ SnSe ₆含量的增加而增加： а = 6.968–6.985Å， b = 12.051–12.078Å， с = 6.945–6.968Å，β= 109.20 °–109.30°，空间群Сс， Z = 4和ρ= 5.75-5.86 g / cm ³。