SILVER ION CONDUCTING BORATE GLASS - EVIDENCE OF ION ASSOCIATION FROM TEMPERATURE-DEPENDENT MOBILITY, CONDUCTIVITY, AND IR SPECTRAL STUDIES

The temperature dependence of ionic mobility for a silver ion conducting borate glass with composition 55.5 AgI-22.25 Ag2O-22.25 B2O3 (in mol%) is reported along with conductivity. Subsequently the value of mobile carriers n is calculated. The value of n is found to decrease with increase in temperature. Two types of ion association mechanisms viz., (i) self association and (ii) network association are proposed to explain the results. The proposed ion associations are checked by optical microscopy and temperature dependent IR spectral studies.