Effect of environment on viscous flow in inorganic oxide glasses
- 1 May 1971
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Vol. 75A (3) , 175-184
- https://doi.org/10.6028/jres.075a.018
Abstract
Results from viscosity and shear structural relaxation measurements conducted above the liquid-liquid phase transition of a series of immiscible inorganic oxide glasses are analyzed. A model is proposed which relates the temperature dependence of the complex modulus and viscosity to the behavior of microstructure in the glass resulting from supercritical fluctuations in composition. It is suggested that the critical microstructure induces differences in local environment in the glass which in turn cause the appearance of distributions of relaxation times. The model is formulated using elementary fluctuation theory and the resulting equations are successfully compared to the data.Keywords
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