Variation of electrical conductivity in enstatite with oxygen partial pressure: Comparison of observed and predicted behavior |
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| Authors: | RL Stocker |
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| Institution: | Department of Geology, Arizona State University, Tempe, AZ 85281 U.S.A. |
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| Abstract: | Oxygen partial pressure influences the electrical conductivity of enstatite because it affects the point-defect concentrations in enstatite. The behavior of the defect concentrations with PO2 are obtained for open and partially closed conditions. On the basis of the defect variations, models for the effect of oxygen pressure on the conductivity can be constructed. The first-order models, which assume one defect type transporting all the charge, predict log(PO2) vs. log(conductivity) slopes that are not in agreement with slopes derived from measurements on natural single crystals of enstatite. The disagreement could result from: (1) more defect species being present than the assumed charge-neutrality condition gives, or (2) the charge is transported by two or more defect types. The data suggesting the latter is the cause of the disagreement, and hence the experimentally derived activation energies must be treated carefully. |
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