DETERMINATION OF IONIC DISTRIBUTIONS OF 3 SORTS OF OXYGENS IN A FEW BINARY SILICATE-GLASSES FROM MOLAR REFRACTIVITY

Ionic distributions of three sorts of oxygens in glasses in the systems Na2OSiO2K2OSiO2 and PbOSiO2 were determined from molar refractivity. The distribution of these oxygen ions in PbOSiO2 glasses was compared with that determined by the XPS method and with the theoretical calculation based on the athermal mixture model. The present result showed good agreement with that by the XPS method when the PbO content was 70 mol % or over, and showed a discrepancy when the PbO content was less than 70 mol %. It was indicated that a theoretical treatment based on a higher approximation that the athermal mixture model is required in order to enable the comparison with experiments for silica contents higher than 50 mol %. © 1979.