The conductivity of the crystals was measured at temperatures of between 20 and 250C. All of the results revealed that the material was a good conductor, even at intermediate temperatures. The F diffusion coefficient varied from 1.5 x 10-8cm2/s at 80C to 8.5 x 10-7 cm2/s at 200C. A phase transition was detected at about 100C. This was assumed to account for a change in the ionic conduction behavior as a function of temperature. At high temperatures, the activation energy for conduction was 0.26eV. At low temperatures, the activation energy was 0.47eV.

W.D.Basler, I.V.Murin, S.V.Chernov: Zeitschrift für Naturforschung, 1981, 36a[4], 519-20