Point-defect formation parameters in olivine

Details Point-defect formation parameters in olivine Point-defect formation parameters in olivine

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...17..108s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 17, Issue 2, p. 108-117.

Physics

10

Scientific paper

The formation internal energy and volume of the point-defect species in olivine are derived for a number of approximate charge-neutrality conditions. The formation parameters of an effectively charged point defect are a function of the approximate condition of charge neutrality. Since the approximate charge-neutrality condition depends upon the partial pressure of oxygen and the activity of enstatite in olivine, changes in the magnitude of these thermodynamic-state variables result in different values of the formation parameters if the charge-neutrality regime is altered. The fractional change in the formation internal energies of the energetically unfavorable defects, such as Si vacancies, is small between the charge-neutrality regions while the fractional change for the favorable defects, such as Mg vacancies, is large.

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