Study of the Qualitative Characteristics of Manganese-Containing Phosphate and Borophosphate Glasses

Abstract—The properties of manganese-containing phosphate and borophosphate glasses were studied: melting temperature, melt viscosity, homogeneity, and thermal and chemical stability. The studied compositions of the matrices meet the regulatory requirements of the vitrification department in terms of melting temperature and melt viscosity. Almost all tempered (original) glasses are X-ray amorphous. Thermal tests of glasses at a temperature of 450°C lead mainly to surface crystallization of samples and, in some cases, to volumetric crystallization. All phosphate glasses are chemically stable provided they contain Al₂O₃ within the prescribed values (14–18 wt %), while borophosphate glasses are stable at a high content of Al₂O₃ (approximately 19.6 wt %). The possibility to include MnO₂ into glasses in the investigated range (from 2 to 7.25 wt %) is shown.