Viscoelastic Relaxation in B2O3
The relative ease with which its viscosity can be measured over a wide range of temperature (260–1600°C) has made B2O3 one of the materials most often used to test viscosity theories. It exhibits two Arrhenius regions: a high temperature region between 800–1400°C and a low temperature one, 260–350°C. In a previous publication1 we have shown that none of the theoretical models for viscosity thus far proposed account for this behavior; not only are they inadequate in an exact quantitative sense, but they also fail to explain the general trends. This inadequacy is quite a general one, having been noted in many types of liquids including silicates, molten salts, aqueous solutions and organic liquids. Recognizing the difficulties that other investigators had encountered, our approach to trying to understand viscous flow was to ask a set of fundamental questions followed by an intensive experimental investigation. In this way we hoped that the data would naturally guide the theoretical development.
KeywordsCorrelation Function Structural Relaxation Viscoelastic Relaxation Activation Free Energy Fictive Temperature
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