In the present study standard enthalpies of formation were measured by reaction and solution calorimetry at stoichiometric compositions of Cd2Pr, Cd3Pr, Cd58Pr13 and Cd6Pr. The corresponding values were determined to be -46.0, -38.8, -35.2 and -24.7 kJ/mol(at), respectively. These data together with thermodynamic data and phase diagram information from literature served as input data for a CALPHAD-type optimization of the Cd-Pr phase diagram. The complete composition range could be described precisely with the present models, both with respect to phase equilibria as well as to thermodynamic input data. The thermodynamic parameters of all intermetallic compounds were modelled following Neumann-Kopp rule. Temperature dependent contributions to the individual Gibbs energies were used for all compounds. Extended solid solubilities are well described for the low- and high-temperature modifications of Pr and also for the intermetallic compound CdPr. A quite good agreement with all viable data available from literature was found and is presented.

中文翻译：

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Cd-Pr金属间化合物的形成焓和Cd-Pr系统的热力学评估。

在本研究中，通过反应和溶液量热法在Cd2Pr，Cd3Pr，Cd58Pr13和Cd6Pr的化学计量组成下测量标准形成焓。相应的值分别确定为-46.0，-38.8，-35.2和-24.7 kJ / mol（at）。这些数据与文献中的热力学数据和相图信息一起用作Cd-Pr相图的CALPHAD类型优化的输入数据。相对于相平衡以及热力学输入数据，可以用本模型精确描述整个组成范围。所有金属间化合物的热力学参数均按照Neumann-Kopp规则建模。温度对所有吉布斯能量的依赖关系均用于所有化合物。对于Pr的低温和高温改性，以及金属间化合物CdPr，扩展的固溶度都有很好的描述。发现并提出了与文献中所有可行数据的很好的一致性。