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- W2051219788 abstract "Abstract Brillouin scattering measurements of B 2 O 3 , GeO 2 and SiO 2 glasses and liquids, to temperatures ≤ 1550°C, reveal anomalous thermo-mechanical behavior. Transverse acoustic waves are supported by the liquids of all three oxides. In all systems, the longitudinal and shear elastic moduli increase with increasing temperature below, and again far above the glass transition. This apparent strengthening of the glassy network below T g is less pronounced, the more fragile the glass former, while in the molten state the opposite seems to be the case. This positive temperature dependence of the elastic properties can be explained by localized structural reorganizations which do not require the breaking of network bonds. The decrease in elastic moduli immediately above T g , characteristic of fragile systems, is due to the increase of the average network ring size, achieved through a low-activation energy neighbor exchange mechanism. The ability of these liquids to support shear stresses at very high temperatures indicates a persistent network structure." @default.
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- W2051219788 date "1997-12-01" @default.
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- W2051219788 title "Extended structural integrity in network glasses and liquids" @default.
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- W2051219788 doi "https://doi.org/10.1016/s0022-3093(97)90113-7" @default.
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