The conductivity of single crystals of β-type material, doped with La3+ or Na+, was investigated. A non-linear least-squares technique was then used to determine the thermodynamic parameters for defect formation and migration within various temperature ranges (table 210). It was suggested that the superionic phase was not massively disordered, and that the present material was not appreciably different to other fluorites.

A.Azimi, V.M.Carr, A.V.Chadwick, F.G.Kirkwood, R.Saghafian: Journal of the Physics and Chemistry of Solids, 1984, 45[1], 23-31

Table 210

Activation Energy for Ionic Transport in β-PbF2