000033392 001__ 33392 000033392 005__ 20240619091636.0 000033392 017__ $$aThis version is available at the following Publisher URL: http://prb.aps.org 000033392 0247_ $$2DOI$$a10.1103/PhysRevB.63.104203 000033392 0247_ $$2WOS$$aWOS:000167402100034 000033392 0247_ $$2Handle$$a2128/1290 000033392 037__ $$aPreJuSER-33392 000033392 041__ $$aeng 000033392 082__ $$a530 000033392 084__ $$2WoS$$aPhysics, Condensed Matter 000033392 1001_ $$0P:(DE-Juel1)VDB4175$$aBuchenau, U.$$b0$$uFZJ 000033392 245__ $$aMechanical relaxation in glasses and the glass transition 000033392 260__ $$aCollege Park, Md.$$bAPS$$c2001 000033392 300__ $$a104203 000033392 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article 000033392 3367_ $$2DataCite$$aOutput Types/Journal article 000033392 3367_ $$00$$2EndNote$$aJournal Article 000033392 3367_ $$2BibTeX$$aARTICLE 000033392 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000033392 3367_ $$2DRIVER$$aarticle 000033392 440_0 $$04919$$aPhysical Review B$$v63$$x1098-0121 000033392 500__ $$aRecord converted from VDB: 12.11.2012 000033392 520__ $$aThe Gilroy-Phillips model of relaxational jumps in asymmetric double-well potentials, developed for the Arrhenius-type secondary relaxations of the glass phase, is extended to a formal description of the breakdown of the shear modulus at the glass transition, the alpha process. The extension requires the introduction of two separate parts of the barrier distribution function f(V), with a different temperature behavior of primary and secondary parts, respectively. The time-temperature scaling of the cu process, together with a sum rule for the whole barrier distribution function, implies a strong rise of the integrated secondary relaxation with increasing temperature above the glass transition. Thus one gets a quantitative relation between the fragility of the glass former and the fast rise of the picosecond process observed in neutron and Raman scattering. The formalism is applied to literature data of polystyrene, vitreous silica and a sodium silicate glass. In the glass phase of polystyrene, one finds a temperature-independent secondary barrier distribution function, in agreement with an earlier Raman result from the literature. Above the glass transition, the secondary barrier distribution function increases with temperature as predicted. 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