Thermodynamic analysis of interaction of UOsub(2+-x) with carbon

Measurement results of equilibrium pressure of CO (Psub(CO)) for the WO2+C system at carbon excess are presented. The change of oxygen potential in the range of WOsub(2+-x) homogeneity are analyzed. Equilibrium pressure of oxygen has been determined on the basis of the Knudsen method by means of direct mass-spectrometric measurements of equilibrium pressure Psub(CO) for the UOsub(1.9995)+C system. On the basis of equilibrium pressure of oxygen and equilibrium constants Ksub(p)f (T) a general analytic dependence of CO pressure is obtained and a diagram of calculated values of equilibrium pressure of Psub(CO) for the UOsub(2+-x)-UCsub(2)-C system at the temperature of 1500-2500 K and O/U values from 1.97 to 2.1 is plotted