Reichmann Thomas L, Richter Klaus W, Delsante Simona, Borzone Gabriella, Ipser Herbert
Department of Inorganic Chemistry (Materials Chemistry), University of Vienna, 1090 Wien, Austria.
Dipartimento di Chimica e Chimica Industriale, Università di Genova, 16146 Genova, Italy.
CALPHAD. 2014 Dec;47:56-62. doi: 10.1016/j.calphad.2014.06.005.
In the present study standard enthalpies of formation were measured by reaction and solution calorimetry at stoichiometric compositions of CdPr, CdPr, CdPr and CdPr. 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.
在本研究中，通过反应量热法和溶液量热法在CdPr、CdPr、CdPr和CdPr的化学计量组成下测量了标准生成焓。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作为Cd-Pr相图CALPHAD型优化的输入数据。就相平衡以及热力学输入数据而言，当前模型能够精确描述整个成分范围。所有金属间化合物的热力学参数均按照诺伊曼-科普规则进行建模。所有化合物均使用了与温度相关的吉布斯自由能贡献。对于Pr的低温和高温变体以及金属间化合物CdPr，均很好地描述了扩展的固溶度。发现与文献中所有可用的有效数据有相当好的一致性，并予以呈现。
