Abstract
Differential thermal analysis up to complete melting was performed for the complete pseudobinary system LiF-BiF3. Melts with high bismuth fluoride concentration show severe evaporation, nevertheless even pure BiF3 could be molten at 655 deg. C. The system contains one intermediate compound BiLiF4 which melts by peritectic decomposition under the formation of LiF at 415 deg. C. The eutectic between BiLiF4 and BiF3 melts at 415 deg. C. By thermodynamic assessment the following parameters were found for BiLiF4: ΔH=-1514900 J/mol, S=158.5 J/mol K, c_p=166.173 -0.01072 T (in J/mol K). The melt has negative excess Gibbs free energy.
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