| Mechanical relaxation in glasses and the glass transition (2001) | |||||||||||
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| Mechanical relaxation glasses and the glass transition Buchenau Institut Festko rperforschung Forschungszentrum lich Postfach lich Germany Received August published February The Gilroy Phillips model relaxational jumps asymmetric double well potentials developed for the Arrhenius type secondary relaxations the glass phase extended formal description the breakdown the shear modulus the glass transition the process The extension requires the introduction two separate parts the barrier distribution function with different temperature behavior primary and secondary parts respectively The time temperature scaling the process together with sum rule for the whole barrier distribution function implies strong rise the integrated secondary relaxation with increasing temperature above the glass transition Thus one gets quantitative relation between the fragility the glass former and the fast rise the picosecond process observed neutron and Raman scattering The formalism applied literature data polystyrene vitreous silica and sodium silicate glass the glass phase polystyrene one nds temperature independent secondary barrier distribution function agreement with earlier Raman result from the literature Above the glass transition the secondary barrier distribution function increases with temperature predicted The ndings allow for interpretation the fragility and the entropy crisis the glass transition DOI PhysRevB PACS number Pf INTRODUCTION Relaxation glasses sometimes also called secondar | |||||||||||
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