Abstract

The SnTe–Sb₂Te₃–Te system was studied in the temperature range 300–400 K by X-ray powder diffraction and EMF measurements of (–) SnTe(s.)|liquid electrolyte, Sn²⁺|(Sn–Sb–Te) (s) (+) reversible concentration cells. An equilibrium solid phase diagram of the system was constructed. All telluride phases of the system, namely, ternary compounds SnSb₂Te₄ and SnSb₄Te₇ and SnTe-base (α) and Sb₂Te₃-base (β) solid solutions, were found to be tie-lined with tellurium. Equations for temperature-dependent EMF in β + Те, β + SnSb₄Te₇ + Те, SnSb₄Te₇ + SnSb₂Te₄ + Те, α + SnSb₂Te₄ + Те, and α + Те heterogeneous phase fields were derived from EMF measurements, and were used to calculate the partial thermodynamic functions of SnTe in alloys. The thus-obtained data combined with the SnTe thermodynamic functions were used to calculate the partial molar functions of tin in alloys. The thus-obtained values and the equilibrium solid phase diagram of the SnTe–Sb₂Te₃–Te system, together with the relevant thermodynamic functions of Sb₂Te₃, were used to calculate the standard Gibbs free energies of formation and enthalpies of formation and the standard entropies of formation for SnSb₂Te₄, SnSb₄Te₇, and Sb₂Te₃- and SnTe-base solid solutions.

中文翻译：

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SnTe-Sb2Te3-Te 体系中的固相平衡和锡-锑碲化物的热力学性质

摘要

SnTe–Sb ₂ Te ₃ –Te 体系在 300–400 K 的温度范围内通过 X 射线粉末衍射和 (–) SnTe(s.)|液体电解质、Sn ²⁺ |(Sn–Sb –Te) (s) (+) 可逆浓差电池。构建了系统的平衡固相图。发现系统的所有碲化物相，即三元化合物 SnSb ₂ Te ₄和 SnSb ₄ Te ₇以及 SnTe 基 (α) 和 Sb ₂ Te ₃基 (β) 固溶体，均与碲连接。_{β + Те, β + SnSb 4} Te ₇ + Те, SnSb ₄中的温度依赖性 EMF 方程Te ₇ + SnSb ₂ Te ₄ + Те、α + SnSb ₂ Te ₄ + Те 和 α + Те 异相场来自 EMF 测量，并用于计算 SnTe 在合金中的部分热力学函数。由此获得的数据与 SnTe 热力学函数相结合，用于计算合金中锡的偏摩尔函数。由此得到的值和SnTe-Sb ₂ Te _{3 -Te体系的平衡固相图，以及Sb 2} Te ₃的相关热力学函数_{, 用于计算 SnSb 2} Te ₄、SnSb ₄ Te ₇和 Sb ₂ Te ₃ - 和 SnTe 基固溶体的标准形成吉布斯自由能和形成焓和标准形成熵。