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A thermodynamic study of the cadmium–neodymium system

机译:镉钕系的热力学研究

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摘要

AbstractCd vapor pressures were determined over Cd–Nd samples by an isopiestic method. The measurements were carried out in the temperature range from about 690 to 1200 K and over a composition range between 48 and 92 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 873 K. By means of a Gibbs–Duhem integration Nd activities and integral Gibbs energies were calculated, using a literature value of ΔfG for the phase Cd6Nd as integration constant. A minimum of ΔfG ≈ −38 kJ g-atom−1 at 873 K was obtained for the phase CdNd, a value that compares well with other CdRE compounds.
机译:摘要采用等渗法测定了Cd–Nd样品上的Cd蒸气压。测量是在大约690至1200 K的温度范围内以及48%至92 at at Cd的组成范围内进行的。从蒸气压中,可以得出所有样品在各自的样品温度下Cd的热力学活性,并根据活性的温度依赖性获得Cd的部分摩尔焓。通过这些部分摩尔焓,Cd活度转换为873K的共同温度。借助Gibbs-Duhem积分计算Nd活度和Gibbs积分能,使用Cd6Nd相的文献值ΔfG作为积分常数。 CdNd相在873 K时的最小ΔfG≈−38 kJ g-atom -1 ,与其他CdRE化合物相比,该值很好。

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