Computer Science
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1397l&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 50, Issue 7, p. 1397-1411.
Computer Science
14
Scientific paper
Experimental thermal diffusion (Soret) fractionation of silicate liquids shows SiO2 to be the principal ingredient of the component fractionating to the hot end of experimental charges. The chemical characteristics of disequilibrium Soret separations resemble those of equilibrium 2-liquid phase separation. This reflects the fact that liquid structural constitution does not depend upon the process leading to chemical separation. The activity-composition relations which lead to silicate liquid immiscibility strongly influence the Soret fractionation behavior of liquids near the solvus. This is especially well illustrated in the system Fa-Lc-Q. The temperature versus composition features of the steady state thermal diffusion profiles may be adequately described by an asymmetric regular solution model for silicate liquids, in contrast to any simpler solution model. This model can be used to quantify Margules parameters and the heat of transport for SiO2 in these silicate liquids. Observation of the rise time and steady state values of Soret fractionation allows calculation of ordinary and thermal diffusion coefficients for SiO2.
Lesher Charles E.
Walker Danielle
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