Effect of enstatite activity and oxygen partial pressure on the point-defect chemistry of olivine

Details Effect of enstatite activity and oxygen partial pressure on the point-defect chemistry of olivine Effect of enstatite activity and oxygen partial pressure on the point-defect chemistry of olivine

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...16..145s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 16, Issue 2, p. 145-156.

Physics

22

Scientific paper

The variation of the point-defect concentrations in olivine with changes in enstatite activity and oxygen partial pressure are derived from formal thermodynamic arguments. Two models for these variations are constructed; the models differ in the choice of the approximate charge-neutrality condition in the near-stoichiometric regime. Under favorable circumstances, the effect of the oxygen partial pressure on olivine's point-defect chemistry can provide a diagnostic technique. Activity differences within the upper mantle may have a significant effect on olivine's transport properties because of their effect on the point-defect concentrations. The activity of enstatite plays an important role in the point-defect chemistry of olivine.

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