Conductivity of glasses in the systems SiO2.PbO.RO, (where R＝Ca, Sr or Ba) was investigated between room temperatureand 530 K. The dependence of log resistivity as well as the activation energy on the PbO content has been studied. Based onthe present experimental results, the possible different conduction mechanisms in such glasses are discussed. It was postulatedthat Pb2+ ions may represent the major charge carrying species in these glasses. This assumption was confirmed by thecalculations of the mean distance between the interstitial Pb2+ ions and the effective center of the O2- ions in the glassnetworks. The variation in the values of the density and the molar volume with PbO content is also discussed in view of theobtained activation energies for the studied glass-systems.
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