Abstract
Specific heat (Cp) data obtained near the phase transition of LaF3 are used to estimate the activation enthalpy for anion disordering, Hd. At the critical point Tc = 263 K, the concentration of disordered fluoride ions is nc = 2.86 × 1020 g−1. In the dielectric phase of LaF3 (T < Tc), Hd is 0.24–0.26 eV. In the superionic phase (T ≥ Tc), where the concentration of disordered fluoride ions exceeds nc, the enthalpy of disordering drops to Hd ≃ 0.04 eV.
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