Viscosity and configurational entropy of silicate melts

Details Viscosity and configurational entropy of silicate melts Viscosity and configurational entropy of silicate melts

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..471r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 3, pp.471-483

Computer Science

59

Scientific paper

With the configurational entropy theory of relaxation processes of Adam and Gibbs (1965), one predicts that the viscosity depends on temperature according to log = A e + B e / TS conf , where S conf is the configurational entropy of the liquid. Thermochemical calculations of S conf performed for some mineral compositions show the importance of non-configurational contributions to the entropy differences between amorphous and crystalline phases. Except for the case of SiO 2 , the available thermodynamic data indicate that the above equation for viscosity accounts quantitatively for the experimentally determined temperature dependence of the viscosity of silicate melts. The Adam and Gibbs theory also provides a simple rationale for the non linear variation of the logarithmic viscosity with composition in mixed alkali silicate liquids at low temperatures, the minimum of viscosity resulting from the contribution of the entropy of mixing to S conf .

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