GLASS-FORMING ABILITY, THERMAL STABILITY AND CHEMICAL DURABILITY OF LEAD BOROPHOSPHATE GLASSES

Abstract

Borophosphate glasses of the PbO-B₂O₃-P₂O₅ system were studied in two compositional series with 50 and 55 mol% PbO. The effect of compositional changes on physical properties of the glasses was investigated. Thermal stability of the glasses was evaluated by a criterion of Hruby using parameters obtained from DTA measurements. Chemical stability corresponds well with the thermal stability. Correlations were made between changes in the physical properties of the glasses and changes in their structure.