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Abstract

The approximate equality between recently published values of the electron affinity of the UO-3 molecule and the first ionization energy of UO-2 entails - via the gas phase equilibrium, UO-2UO-34DUO/2-UO-/3- - significant ion contributions to the vapour pressure of urania, which have not previously been considered in the two-phase equilibria, or in the interpretation of laser evaporation experiments to determine the vapour pressure of this important nuclear fuel. Even allowing for the considerable uncertainty (+-10%) in the cited electron affinity - which is an estimated value, rather than a measured one - these positive and negative ions cannot be neglected even at 2000K, where they can (i) strongly influence the congruently vaporizing composition and (ii) result in significant increases in the total calculated vapour pressure, which by 4000K can amount to as much as 62%.

Additional information

Authors: MAGILL J JRC - KARLSRUHE ESTAB. (GERMANY) HYLAND G J UNIVERSITY OF WARWICK (UK) RAND M H HARWELL LABORATORY UKAEA, OXFORDSHIRE (UK) , JRC - KARLSRUHE ESTAB. (GERMANY);UNIVERSITY OF WARWICK (UK);HARWELL LABORATORY UKAEA, OXFORDSHIRE (UK)
Bibliographic Reference: 5TH INTERNATIONAL CONFERENCE ON HIGH TEMPERATURE AND ENERGY RELATED MATERIALS, ROMA (ITALY), MAY 25-29, 1987 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33570 ORA
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