Phase equilibria in LaBr3-TlBr pseudobinary system. Thermodynamic assessment of LaBr3-MBr (M = Li, Na, K, Rb, Cs, Tl) pseudobinary systems

作者: B. Salamon , J. Kapała , L. Rycerz , I. Szczygieł

DOI: 10.1016/J.CALPHAD.2019.03.006

关键词:

摘要: Abstract The phase equilibria in the lanthanum(III) bromide-thallium bromide pseudobinary system was established by means of differential scanning calorimetry (DSC). DSC investigations were performed on samples with different compositions whole mole fraction x(LaBr3) range. This includes one intermediate compound Tl2LaBr5. It melts congruently at 829 K. TlBr-Tl2LaBr5 and Tl2LaBr5-LaBr3 eutectics, corresponding to LaBr3 x = 0.088 (T = 687 K) x = 0.491 (T = 788 K) respectively, found from Tammann's plot. LaBr3-TlBr also optimized CALPHAD method using available experimental data. Experimental calculated data concerning compared for LaBr3-MBr (M = Li-Cs) systems, which have been method. thermodynamic properties liquid systems modelled Associated Solution Model {3 M+ + LaBr63−} (M = Li-Cs, Tl) associate. dependencies mixing enthalpy entropy estimated all investigated systems. formation Gibbs energy temperature range existence compounds discussed. optimization indicates that participation associate (M = K⋯Cs, increases increase ionic radius monovalent metal.

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