Phase Behavior and Thermodynamics of U-Mo-C System

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概要

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• The U-Mo-C system has been studied to supplement the hitherto available phase-diagram data and to deduce therefrom the thermodynamic property of UMoC<SUB>1.7</SUB> and UMoC<SUB>2</SUB>. It is shown that a peritectic four-phase reaction takes place : UC+Mo⇔UMoC<SUB>1.7</SUB>+liquid, at 1, 830°±30°C. The phase relations between orthorhombic UMoC<SUB>2</SUB> and mono-clinic UMoC<SUB>1.7</SUB> may be defined by UMoC<SUB>1.7</SUB>⇔UMoC<SUB>2</SUB>+liquid, which will occur at some temperature between 2, 200° and 2, 350°C, the reported melting point of UMoC<SUB>2</SUB>. Liquidus projection for the U-Mo-C system is presented on the basis of these results and from data found in literature. The free energy equations for the formation of UMoC<SUB>1.7</SUB> and UMoC<SUB>2</SUB> are respectively estimated to be ΔG°<SUB>f</SUB>(UMoC<SUB>1.7</SUB>)=-40, 350-0.69T cal/mol and ΔG°<SUB>f</SUB>(UMoC<SUB>2</SUB>)= -46, 360-0.69T cal/mol, both in the temperature range 2982, 100 K.

• 一般社団法人 日本原子力学会の論文

著者

• UGAJIN Mitsuhiro

  Division of Nuclear Fuel Research, Japan Atomic Energy Research Institute

• ABE Jiro

  Division of Nuclear Fuel Research, Japan Atomic Energy Research Institute

• KURIHARA Masayoshi

  Division of Nuclear Fuel Research, Japan Atomic Energy Research Institute

関連論文

• Phase Behavior and Thermodynamics of U-Mo-C System
• Thermodynamic Activity of Carbon in Molybdenum-Containing Uranium Carbide

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