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The phase diagrams and thermodynamic properties of the C–RE (RE = La, Ce and Pr) binary systems were assessed by using the CALPHAD method applied to the experimental data in the literature. In the C–RE (RE = La, Pr) systems, RE₂C₃ and βREC₂ (high-temperature form of REC₂ phase) were modeled as non-stoichiometric phases while αREC₂ (low-temperature form of REC₂ phase) was considered to be stoichiometric phase. For La₂C phase, enthalpy increment (H_T –H_298K ) information was also considered in the optimization. Due to their negligible homogeneities, intermediate compounds Ce₂C₃ and CeC₂ in the C–Ce system, were treated as stoichiometric phases. One set of self-consistent thermodynamic parameters was finally obtained for each of these binary systems. Comparisons between calculated and measured phase diagrams as well as thermodynamic properties showed that most of the experimental information can be satisfactorily accounted for by the present thermodynamic descriptions.