An optimum hot-pressing technology was developed which yielded transparent fluoride ceramics with fast ionic conductivities. It was found that the conductivity was equal to 1 x 10-6S/cm at 500K, and that the overall data could be described by:

o (S/cm) = 25 exp[-0.741(eV)/kT]

V.Trnovcová, A.N.Smirnov, P.P.Federov, F.Hanic, V.Kliment, V.Smatko: Solid State Phenomena, 1994, 39-40, 231-4