Abstract
The anionic electrical conductivity σdc(T) of the superionic LaF3 conductor single crystal has been studied by impedance spectroscopy in a wide (312–1073 K) temperature range. Electrical measurements in a protective nitrogen atmosphere have been carried out. It is shown that the σdc values change from 1.5 × 10–5 to 7 × 10–2 S/cm (by a factor of ~5 × 103) in the investigated temperature range. A high-temperature anomaly of the σdc(T) dependence has been found at T0 ≈ 970 K, which is apparently indicative of the onset of a diffuse (Faraday) phase transition in the LaF3 tysonite structure.
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