Empirical methods for estimating the linear coefficient of expansion (α) of oxide glasses have been derived. New parameters (βi) are define for the glass modifiers. The βi are calculated from the ionic radius R, charge Z, and the electronegativity EN of the modifiers. βi parameters and their normalized values (γi) with respect to a standard modifier, classify the modifiers according to their contribution to the thermal expansion. Two semi-emperical relations were derived for the calculation of α. Calculated expansion coefficient for over 500 glass compositions are within ± 15% of the measured values. The application of the methods to ternary, quaternary and multicomponent industrial glasses is treated.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry