Frequency dispersion curves of conductivity as a function of temperature were obtained, at 5Hz to 13MHz, in 2-phase mixtures of β-AgI solid solution + AgBr solid solution (for a concentration of 20mol%AgBr; which had the maximum direct-current conductivity) and pure β-AgI at 278 to 333K. It was found, for this concentration of AgBr, that the direct-current conductivity was 55 times higher than that of β-AgI at 302K; with a correspondingly lower activation energy for the former material. The calculated alternating-current conductivity parameters also reflected the effects of Br in promoting Ag ions. The Br mixture also exhibited a lower activation energy for the hopping rate, as well as higher values, of the attempt frequency for ionic migration and the Kohlrausch parameter, than the corresponding parameters for β-AgI. The results were explained in terms of the effects of lattice polarizability upon ion motion.

Effect of AgBr on the Electrical Conductivity of β-AgI. J.F.Jurado, J.A.Trujillo, B.E.Mellander, R.A.Vargas: Solid State Ionics, 2003, 156[1-2], 103-12