In this report, a topological constraint model is developed to predict the glass transition temperature (Tg) and liquid fragility (m) of xBi2O3·(1-x)NaPO3 glass-forming systems by considering the hierarchy of temperature-dependent constraints, including contributions from the modifying cations (Bi3+ and Na+). The model is shown to give an accurate prediction of the Tg and m as a function of composition (x). The increase of Tg with x is mainly caused by the formation of the Bi—O linear constraints and also contributions from O–Bi–O angular constraints, which increase the connectivity of the network. The model also accurately predicts the trend of m with composition, which shows a minimum at around x = 5 mol% due to the competition between the contributions from the Na—O linear constraints and the O–Bi–O angular constraints.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry