The temperature dependence of conductivity sigma and mobility mu (and hence the carrier concentration n) have been directly measured for silver-berate glass compositions (undoped and doped with PbO or SnO2). The sigma and mu increase while n decreases with the increase in temperature. The decrease in n has been assigned to Ion Association (Self and Network) as a result of formation of Non-Bridging Oxygen (NBO) functional groups. The PbO doping also increases the number of NBOs. A phenomenological description of the changes introduced in the potential energy experienced by the mobile cation is also given in terms of the formation of NBO’s and/or Ion Association.