Abstract
Experimental data for the system LiBr–LaBr 3 was subjected to a critical thermodynamic assessment using the CALPHAD approach. To reach a self-consistent thermodynamic description for the constituent phases in the system, it appeared to be necessary to reassess the experimental heat capacity data of the stoichiometric compound LaBr 3. A two-sublattice ionic solution model for the liquid, denoted as ( Li + ) P : (Br −,LaBr 6 −3,LaBr 3) Q, was employed to represent the phase diagram and heat of mixing data. Our assessment resulted in a Gibbs energy formation covering the temperature range between 300 and 1100 K. To give our assessment of LiBr–LaBr 3 a wider application to higher-order alkali–bormide–LaBr 3 systems, additional assessments of the binaries NaBr–LaBr 3 and KBr–LaBr 3 were carried out. By modelling the liquid phase with the two-sublattice ionic solution model, a thermodynamic description, compatible in the three binary systems, was obtained for these systems covering the temperature range between 300 and 1100 K.
Published Version
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