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- W2420804558 abstract "Abstract The Adam-Gibbs theory provides a robust connection between the transport or relaxation properties of melts and their thermochemical properties. In its expanded form: log η = A + B T S c Tg + C p c ln T T g the equation has adjustable unknown parameters A, B and Sc ( Tg ) which can be estimated from experimental estimates of configurational heat capacity ( Cp c ), glass transition temperature ( Tg ) and viscosity ( η ). Here, we use recently published datasets for anhydrous and hydrous silicate melts and glasses (N ~ 50) for which there are measurements of log η and calorimetric measurements of Cp c and Tg . Our fitting strategy follows the approach developed by previous workers with the sole exception that we assume all silicate melts converge to a common, but unknown, high temperature limit to melt viscosity (e.g., A = log η ∞ ). Our optimal value for A is − 3.51 ± 0.25. A consequence of a common, high-temperature limit to silicate melt viscosity is that the corresponding model values of glass transition temperature ( Tg 12 ), melt fragility ( m ), and the ratio Cp c / S c are constrained to lie on a single plane approximated as: Cp c S c = − Tg 12 243399 − m 15.518 + 0.996 thereby establishing a quantitative connection between calorimetric and rheological measurements. Lastly, we show a good correspondence between values of Tg 12 and fragility ( m ) from this Adam-Gibbs based model of melt viscosity and values predicted by the GRD viscosity model for multicomponent silicate melts (cf. Giordano et al., 2008)." @default.
- W2420804558 created "2016-06-24" @default.
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- W2420804558 date "2017-06-01" @default.
- W2420804558 modified "2023-09-27" @default.
- W2420804558 title "Modelling configurational entropy of silicate melts" @default.
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- W2420804558 doi "https://doi.org/10.1016/j.chemgeo.2016.07.019" @default.
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