The conductivity, σi, of the γ-phase of dilute pseudo-binary alloys, (CuBr)1−x(Cu2Se)x (x ≤ 0.1), was measured by using an alternating-current method. An increase in the ionic conductivity, which was proportional to x, was observed and was attributed to interstitial ions supplied by the dissolved Cu2Se. It was found that the temperature dependence of the mobility of the interstitial ions, μ, as evaluated using the relationship, Δσi/x = kμ (k constant), was bent at a temperature which corresponded to the extrinsic–intrinsic transition of the base material.

Ionic Conduction in Dilute Pseudo-Binary Systems CuBr–Cu2Se. Y.Zheng, M.Kusakabe, H.Okazaki: Solid State Ionics, 1998, 110[3-4], 263-7