Viscosity activation energy

Author： Avramov Isak  

Publisher： Society of Glass Technology

ISSN： 0031-9090

Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.48, Iss.1, 2007-02, pp. : 61-63

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

The standard procedure of determining the activation energy for shear viscosity from the slope L of the Arrhenius plot, lgη against 1/T leads frequently to overestimated values. The article discusses the significance of L and shows that an important information can be retrieved from it value as the fragility parameter can be formulated as α=0·007Lg/Tg. Fragility parameter α=1 is an indication for a strong glass with constant activation energy. It is demonstrated that the average jump frequency model describes fairly the dependence of viscosity on chemical composition. On the contrary, models based on mean activation energy considerations fail completely.

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