The anionic electrical conductivity sigma(dc)(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 sigma(dc) values change from 1.5 x 10(-5) to 7 x 10(-2) S/cm (by a factor of similar to 5 x 10(3)) in the investigated temperature range. A high-temperature anomaly of the sigma(dc)(T) dependence has been found at T-0 approximate to 970 K, which is apparently indicative of the onset of a diffuse (Faraday) phase transition in the LaF3 tysonite structure.
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