Thermodynamic Study of a U-Fe Alloy by Means of Knudsen Effusion Mass Spectrometry

Abstract

A thermodynamic study of the vaporization of U-0.3 at%Fe alloy was performed by using the Knudsen-effusion mass spectrometric method in the temperature range of 1,780~2,180 K. Vapor pressures of U and Fe were determined as a function of temperature and the activity coefficients were derived which were compared with the activity coefficients calculated from phase diagrams. Both experimental and calculated values of Fe activity coefficient were considerably small and agreed well with each other, suggesting the estimation method of this study to be appropriate.