Heat capacity, thermal expansion, and sensitivity to the hydrostatic pressure of (NH₄)₂KZrF₇ elpasolite are studied in a wide temperature range. The changes in deformation and entropy during successive phase transitions are determined: Δ(ΔV/V) = 3·10⁻⁴; ΔS = 8 J/mol K The temperatures and entropies of phase transitions turned out to be slightly sensitive to pressure changes. An analysis of the entropy of phase transformations was performed in the framework of the model of the cubic phase structure Fm-3 m. In the low temperature phase, an anomalous behavior of thermodynamic properties, which is not characteristic of phase transitions, was observed, accompanied by a significant change in the crystal lattice entropy.

在较宽的温度范围内研究了（NH ₄）₂ KZrF ₇锂云母的热容，热膨胀和对静水压力的敏感性。确定连续相变期间的变形和熵的变化：Δ（ΔV/ V）= 3·10 ^-4；ΔS= 8 J / mol K结果证明，相变的温度和熵对压力变化略微敏感。在立方相结构Fm-3 m的模型框架内对相变的熵进行了分析。在低温相中，观察到热力学性质的异常行为，这不是相变的特征，伴随着晶格熵的显着变化。