Composition dependence of some properties of phosphate glasses containing Al2O3, B2O3, and SiO2

Phosphate-based glasses have an excellent combination of properties which can be widely used in optical and illumination engineering, electronics, and other fields. For the development of glasses with specified properties it is necessary to investigate the dependences of the latter on the concentration in the glass of individual components. Of the components of phosphate glasses, the oxides of aluminum, boron, and silicon are of particular theoretical and practical importance, because an addition of these oxides provides a reduction in the crystallization capacity of phosphate glasses and an increase in the chemical stability. In this study, the subjects of the investigation were multicomponent alkali calcium phosphate glasses. It was concluded that changes in their properties, as a function of the concentration of oxides, are produced by the ratio of various aluminum and silicon complexes in the structure of the glass.