The room-temperature conductivity of Cu4RbCl3(I2-xClx) decreased almost linearly, from 0.39S/cm for the stoichiometric composition, to 0.28S/cm for an x-value which was equal to 0.40. It was suggested that corrections for density differences could increase the measured values by some 10%. The activation enthalpy for the motion of Cu+ ions ranged from 0.112eV, for an x-value of zero, to 0.117eV for an x-value of 0.40. The decrease in conductivity with increasing x-value was attributed to the existence of disorder which was introduced by the replacement of I with Cl.

K.Nag, S.Geller: Journal of the Electrochemical Society, 1981, 128[12], 2675-8