The purpose of the present study was to examine the thermodynamic properties and vaporization processes in the Sm₂O₃–ZrO₂ system by the Knudsen effusion mass spectrometric method (KEMS). The samples in the system under consideration were synthesized by the solid-state method using a high-energy ball mill. Vapor over the Sm₂O₃–ZrO₂ system consisted of SmO, Sm, and O in the temperature range 2200–2540 K. Concentration dependences of the SmO and Sm partial vapor pressures, the component activities, and excess Gibbs energies were obtained at a temperature of 2452 K in the compositional range of 0.23–0.73 Sm₂O₃ mole fraction. These data evidenced negative deviations from the ideal behavior and a possibility to use the subregular solution model to describe the concentration dependences of the thermodynamic properties in the Sm₂O₃–ZrO₂ system. Correlations were found between the observed changes in the thermodynamic behavior of the system mentioned and the relative number of bonds when the second coordination sphere was taken into consideration in the condensed phase calculated by the Generalized Lattice Theory of Associated Solutions.

本研究的目的是通过Knudsen扩散质谱法（KEMS）检查Sm ₂ O ₃ -ZrO ₂系统中的热力学性质和汽化过程。使用高能球磨机通过固态方法合成了所考虑系统中的样品。在Sm ₂ O ₃ -ZrO ₂系统上的蒸汽由SmO，Sm和O组成，温度范围为2200–2540K。温度为2452 K，组成范围为0.23–0.73 Sm ₂ O ₃摩尔分数。这些数据证明了与理想行为的负偏差，并且有可能使用亚常规溶液模型描述Sm ₂ O ₃ -ZrO ₂系统中热力学性质的浓度依赖性。当在由关联溶液的广义格子理论计算的凝聚相中考虑第二个配位球时，所观察到的系统热力学行为的变化与键的相对数目之间存在相关性。