Relaxation behavior is critically important for nearly all high-tech applications of glass. It is also known as one of the most difficult unsolved problems in condensed matter physics. The relaxation behavior of glass can be described using the stretched exponential decay function (Formula presented.), the shape of which is governed by the dimensionless stretching exponent β. Here, a temperature-dependent model for β(T) is proposed. The model is derived based on the Adam-Gibbs relationship and insights from the energy landscape description of glass-forming systems. The model captures previously known limiting values of β(T) while also providing a continuous transition between these limits. Additionally, the model captures the effects of fragility and thermal history. The model is validated with experimental data for commercial silicate glasses and a borate glass.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry