Upper and lower critical points: Thermodynamic constraints on the solution properties of silicate melts

Details Upper and lower critical points: Thermodynamic constraints on the solution properties of silicate melts Upper and lower critical points: Thermodynamic constraints on the solution properties of silicate melts

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.2365h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 13, pp.2365-2377

Computer Science

1

Scientific paper

Thermodynamic stability analysis both classical and nonclassical is applied to silicate melts to examine the possible occurrence of two liquid fields with upper and/or lower critical temperatures. The conditions for the existence of an upper critical point in a binary silicate melt are that the second derivatives of the enthalpy and entropy with respect to composition are both negative in supercritical melts. The necessary condition for the existence of a lower critical point is that the excess entropy is negative in near critical melts. The excess entropy of olivine-rich melts is likely to be negative, implying that a two-liquid field with a lower critical point may be encountered in superliquidus peridotite melts.

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