Abstract
ABSTRACTThe Ge-Yb binary system was thermodynamically assessed by CALPHAD (CALculation of PHAse Diagram) approach based on the available experimental data of thermochemical properties and phase equilibria. The liquid phase and the terminal phases, Fcc_A1 (Yb), Bcc_A2 (Yb) and Diamond_A4 (Ge), are described by a substitutional solution model, and their excess Gibbs free energies are formulated with the Redlich-Kister expression. The intermetallic compounds, Yb3Ge8, Yb3Ge5, Yb11Ge10, Yb5Ge4, Yb5Ge3 and Yb2Ge, are treated as strict stoichiometric compounds. A set of self-consistent thermodynamic parameters for the system is obtained. The calculated phase diagrams and thermochemical properties are in good agreement with the available experimental data.
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