Viscosity Characteristics of Glasses of the Na₂O–K₂O–B₂O₃–SiO₂ System

Abstract— The results of a comparative study of the viscosity characteristics of borosilicate glasses of the Na₂O–K₂O–B₂O₃–SiO₂ system with different ratio values R = (Na₂O + K₂O)/B₂O₃ and K = SiO₂/B₂O₃ are presented. Using infrared spectroscopy, the difference in the structural role of B₂O₃ in glasses of multiboron and highly alkaline compositions, which is reflected in the nature of the change in the viscosity indices of borosilicate glasses of the Na₂O–K₂O–B₂O₃–SiO₂ system in areas with R > 1 and R < 1, is confirmed.