Re-determination and re-assessment of the thermodynamics of sublimation of uranium dioxide. [1813 to 2463/sup 0/K]

The reliability of the thermodynamic data for the vaporization of UO/sub 2/ was improved by presenting precise mass spectrometric measurements of the enthalpy of sublimation ever a wide temperature range; calculation of thermodynamic functions for UO/sub 2/ from the critical assessment of available data, and analyzing the departure from molecular flow and the failure of the Knudsen effusion method at vapor pressures of UO/sub 2/ in excess of 10/sup -4/ atm.