Thermodynamic Calculation on the Vaporization of Fission-Produced Noble Metal System in Vacuum and Oxidative Atmosphere at High Temperatures

摘要

The vaporization behavior of fission-produced noble metal system (Mo-Ru-Pd, Mo-Ru-Rh and Mo-Tc-Pd) in vacuum and oxidative atmosphere at high temperatures was investigated by the thermodynamic calculation on the basis of the regular solution model and the available experimental data. The palladium and rhodium in the alloys, and molybdenum and ruthenium in the alloys vaporize preferentially at high temperature in vacuum and in air, respectively. At low temperature below 385 K in air, ruthenium and technetium in the alloys vaporize predominantly by oxidation.