Publikace detail

Initial stage of physical ageing in network glasses

Rok: 2012

Druh publikace: článek v odborném periodiku

Název zdroje: Philosophical Magazine

Název nakladatele: Taylor & Francis Ltd.

Místo vydání: Abingdon

Strana od-do: 4182-4193

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Initial stage of physical ageing in network glasses	An atomistic view on Johari-Goldstein secondary beta-relaxation processes responsible for structural relaxation far below the glass transition temperature (T-g) in network glasses is developed for the archetypal chalcogenide glass, As20Se80, using positron annihilation lifetime, differential scanning calorimetry, Raman scattering and nuclear magnetic resonance techniques. Increased density fluctuations are shown to be responsible for the initial stage of physical ageing in these materials at the temperatures below T-g. They are correlated with changes in thermodynamic parameters of structural relaxation through the glass-to-supercooled liquid transition interval. General shrinkage, occurred during the next stage of physical ageing, is shown to be determined by the ability of system to release these redundant open volumes from the glass bulk through the densification process of glass network.	chalkogenidové sklo; DSC; NMR
eng	Initial stage of physical ageing in network glasses	An atomistic view on Johari-Goldstein secondary beta-relaxation processes responsible for structural relaxation far below the glass transition temperature (T-g) in network glasses is developed for the archetypal chalcogenide glass, As20Se80, using positron annihilation lifetime, differential scanning calorimetry, Raman scattering and nuclear magnetic resonance techniques. Increased density fluctuations are shown to be responsible for the initial stage of physical ageing in these materials at the temperatures below T-g. They are correlated with changes in thermodynamic parameters of structural relaxation through the glass-to-supercooled liquid transition interval. General shrinkage, occurred during the next stage of physical ageing, is shown to be determined by the ability of system to release these redundant open volumes from the glass bulk through the densification process of glass network.	chalcogenide glass; positron annihilation lifetime; DSC; NMR; Raman scattering; ageing

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