Abstract—

The ternary reciprocal system Na⁺,Ba²⁺||Br^–,\({\text{SO}}_{{\text{4}}}^{{{\text{2}} - }}\) has been divided into simplexes by a thermodynamic method, chemical interaction in the system has been described, and its phase tree has been constructed. The melting points and compositions of the eutectic alloys in the binary system BaBr₂–BaSO₄ and pseudobinary system NaBr–BaSO₄ have been calculated by the Schroeder method, and those of the eutectic alloys in the stable triangles NaBr–BaBr₂–BaSO₄ and NaBr–Na₂SO₄–BaSO₄ of the ternary reciprocal system have been calculated by a Martynova–Susareva method. Differential thermal analysis has been used to confirm the division of the Na⁺,Ba²⁺||Br^–,\({\text{SO}}_{{\text{4}}}^{{{\text{2}} - }}\) system and experimentally study the phase compatibility triangles. We have determined the melting points and compositions of the alloys corresponding to points of invariant equilibria, described equilibrium states for each element of the ternary reciprocal system, constructed a crystallization tree, and calculated the principal thermodynamic parameters of the ternary eutectic alloys.

中文翻译：

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三元倒易系统中的相平衡 Na+,Ba2+||Br–, $${\text{SO}}_{{\text{4}}}^{{2 - }}$$

摘要——

三元倒易系统 Na ⁺ ,Ba ²⁺ ||Br ^– , \({\text{SO}}_{{\text{4}}}^{{{\text{2}} - }}\)有用热力学方法将其划分为单纯形，描述了系统中的化学相互作用，并构建了其相树。二元体系BaBr ₂ -BaSO ₄和拟二元体系NaBr-BaSO ₄中的共晶合金的熔点和成分已经通过Schroeder方法计算，以及稳定三角形NaBr-BaBr ₂ -BaSO ₄中的共晶合金的熔点和成分和 NaBr-Na ₂ SO ₄ -BaSO ₄三元互易系统的 已通过 Martynova-Susareva 方法计算。差热分析已用于确认 Na ⁺ ,Ba ²⁺ ||Br ^– , \({\text{SO}}_{{\text{4}}}^{{{\text{2 }} - }}\)系统并实验研究相位兼容性三角形。我们已经确定了对应于不变平衡点的合金的熔点和成分，描述了三元互易系统中每个元素的平衡状态，构建了结晶树，并计算了三元共晶合金的主要热力学参数。