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• W2044496386 abstract "The viscous-flow behavior and temperature dependence of the elastic moduli of chalcogenide glasses from the germanium-selenium system were studied by means of homemade high-temperature indentation setup and resonant-frequency technique (1--10 kHz), respectively, for temperatures between 0.8 and 1.2$phantom{rule{0.16em}{0ex}}ifmmodetimeselsetexttimesfi{}phantom{rule{0.16em}{0ex}}{T}_{mathrm{g}}$. The softening rates, both in the elastic and in the viscous-flow regimes, were correlated to network destructuration or reorganization events in the light of previously reported high-temperature neutron-scattering data. The concomitant change of Poisson's ratio (ensuremath{nu}) and the thermodynamic parameters of the thermally activated viscous-flow process were characterized and provide a new basis for the understanding of the sources for the softening in the transition range. The temperature dependence of ensuremath{nu} suggests weak changes of the network cross-linking degree at large Ge contents. On the contrary, in the case of a-Se, a steep fragmentation of the structural units is inferred from the ensuremath{nu}($T$) data, and the flow process is accompanied by a huge entropy change (activation entropy at saddle point). The entropy contribution at ${T}_{mathrm{g}}$ (${T}_{mathrm{g}}$ ifmmodetimeselsetexttimesfi{} ensuremath{Delta}${S}_{mathrm{a}}$) represents more than 50% of the activation enthalpy for flow (ensuremath{Delta}${H}_{mathrm{a}}$) and increases with the selenium content. Hence the free activation energy (ensuremath{Delta}${G}_{mathrm{a}}$) is much smaller than apparent activation energy as derived from viscosity data." @default.
• W2044496386 created "2016-06-24" @default.
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• W2044496386 date "2011-08-17" @default.
• W2044496386 modified "2023-10-17" @default.
• W2044496386 title "High-temperature elasticity and viscosity of Ge<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>Se<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>glasses in the transition range" @default.
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• W2044496386 doi "https://doi.org/10.1103/physrevb.84.064201" @default.
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