Equilibrium Pressures over BeF{sub 2}/LiF(Flibe) Molten Mixtures
- University of California (United States)
The pressures of the vapor species in equilibrium with Flibe at {approx}600 deg. C are determined from work by Buchler and Stauffer and by Baes and coworkers. The former authors show that the principal vapor species are BeF{sub 2}(g) and LiBeF{sub 3}(g). The measurements and the theoretical model of Baes provide accurate values of the activity coefficient of BeF{sub 2} in Flibe. When combined with the vapor pressure of pure BeF{sub 2}, the equilibrium pressure of BeF{sub 2} is determined as a function of melt composition and temperature. The activity coefficient of LiF is not measured, but it is obtained by application of the Gibbs-Duhem equation to the measured activity coefficient of BeF{sub 2}. Thus, the partial pressure of LiF(g) is also known. The pressure of the mixed dimer LiBeF{sub 3} is calculated from the gas phase equilibrium for the formation of the dimer from the two monomers, with the equilibrium constant given by Buchler and Stauffer. The vapor pressure at 600 deg. C extrapolated from high-temperature Oak Ridge National Laboratory data is {approx}60% higher than the predicted values.
- OSTI ID:
- 20845832
- Journal Information:
- Fusion Science and Technology, Vol. 41, Issue 2; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 1536-1055
- Country of Publication:
- United States
- Language:
- English
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