Cadmium vapor pressures were determined over Ce-Cd samples by an isopiestic method. The measurements were carried out in the temperature range from 690 to 1080 K and over a composition range of 48-85 at% Cd. From the vapor pressures thermodynamic activities of Cd were derived for all samples at their respective sample temperatures, and partial molar enthalpies of Cd were obtained from the temperature dependence of the activities. With these partial molar enthalpies the Cd activities were converted to a common temperature of 823 K. By means of a Gibbs-Duhem integration Ce activities were calculated, using a corresponding literature value for the two-phase field (CeCd11+L) as integration constant. Finally integral Gibbs energies were calculated for the composition range 48-100 at% Cd with a minimum value of -37 kJ g-atom-1 at 823 K in the phase CeCd. Phase boundaries of the intermetallic compounds CeCd, CeCd2, Ce13Cd58, and CeCd11 were estimated from the vapor pressure measurements and from SEM analyses.

中文翻译：

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铈镉系统的热力学研究。

通过等离子法确定了Ce-Cd样品上的镉蒸气压。在690至1080K的温度范围和48-85at％Cd的组成范围内进行测量。从蒸气压推导出所有样品在其各自的样品温度下的Cd热力学活性，并根据活性的温度依赖性获得Cd的部分摩尔焓。利用这些部分摩尔焓，Cd活度转换为823 K的共同温度。借助于Gibbs-Duhem积分，使用两相场的相应文献值（CeCd11 + L）作为积分常数，计算Ce活度。最后，在CeCd相中，计算出组成范围为48-100 at％Cd的最小Gibbs积分能量，在823 K处的最小值为-37 kJ g-atom-1。