Abstract
In recent years, the fluorite-structured solid solutions with the general formula, (MF2)1-x(RF3)x (M = Ca, Sr, Ba, Pb and R is a rare-earth element or Y), have been the subject of numerous experimental studies focussed on their superionic properties. The overall cubic crystal symmetry (space group Fm3m) is conserved up to x ≶ xmax, where xmax ⊁ 0.4-0.5 depending on M and R. The zone centre phonons and phonon dispersion along three symmetry directions of the mixed superionic compound (BaF2)1-x(LaF3)x have been investigated by applying de Launey angular force model for x ≶ xmax. The calculated results are compared and explained with available experimental results.
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