The conductivity of the α-phase material was equal to 0.76S/cm at 431K and equal to 0.76S/cm at 419K. An extrapolation of these values to 298K indicated a conductivity of 0.29S/cm. The respective values, when corrected for density variations, were equal to 0.84, 0.80 and 0.35S/cm. The activation enthalpy for migration was deduced to be equal to 0.112eV. The conductivity of the γ-phase was equal to 5.3 x 10-6S/cm at 298K, and the conductivity of the β-phase was equal to 0.11S/cm at 425.5K. The activation enthalpy for migration in the β-phase was equal to 0.77eV.

S.Geller, A.K.Ray, H.Z.Fardi, K.Nag: Physical Review B, 1982, 25[4], 2968-70