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In this paper, the phase diagram of the DyCl3-NaC1 system is optimized and calculated with CALPHAD (calculation of phase diagram) technology. A set of thermodynamic functions of compounds Na3 DyCl6, NaDyCl4, and NaDy2 Cl7 have been optimized and calculated based on an interactive computer-assisted analysis. The optimized thermodynamic parameters, calculated phase diagram and experimental phase diagram are thermodynamically self-consistent.