Article ID Journal Published Year Pages File Type
673914 Thermochimica Acta 2013 5 Pages PDF
Abstract

Differential thermal analysis up to complete melting was thoroughly performed for the pseudobinary system LiF–BiF3. Melts with high bismuth fluoride concentration suffered from high evaporation; nevertheless even pure BiF3 could be molten at 655 °C. The system contains one intermediate compound BiLiF4 which melts by peritectic decomposition with the formation of LiF at 450 °C. The eutectic between BiLiF4 and BiF3 melts at 415 °C. Thermodynamic assessment yielded the following parameters for BiLiF4: ΔH = −1, 514, 900 J mol−1, S = 158.5 J mol−1 K−1, cp = 166.173 − 0.01072 · T (in J mol−1 K−1). The melt has negative excess Gibbs free energy.

► The LiF–BiF3 phase diagram is described and assessed for the first time. ► Intermediate compound BiLiF4 melts incongruently with peritectic formation of LiF. ► Density disparity between components leads to non-equilibrium effects.

Related Topics
Physical Sciences and Engineering Chemical Engineering Fluid Flow and Transfer Processes
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