Physics – Geophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224315d&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 24, CiteID L24315
Physics
Geophysics
16
Exploration Geophysics: Magnetic And Electrical Methods (5109), Mineral Physics: Electrical Properties, Mineral Physics: Physical Thermodynamics, Mineral Physics: Instruments And Techniques
Scientific paper
The electrical conductivity (σ) was measured for a single crystal of San Carlos olivine (Fo89.1) for all three principal orientations over oxygen fugacities 10-7 < fO2 < 101 Pa at 1100, 1200, and 1300°C. Fe-doped Pt electrodes were used in conjunction with a conservative range of fO2, T, and time to reduce Fe loss resulting in data that is ~0.15 log units higher in conductivity than previous studies. At 1200°C and fO2 = 10-1 Pa, σ[100] = 10-2.27S/m, σ[010] = 10-2.49S/m, σ[001] = 10-2.40S/m. The dependences of σ on T and fO2 have been simultaneously modeled with undifferentiated mixed conduction of small polarons and Mg vacancies to obtain steady-state fO2-independent activation energies: Ea[100] = 0.32 eV, Ea[010] = 0.56 eV, Ea[001] = 0.71 eV. A single crystal of dry olivine would provide a maximum of ~100.4 S/m azimuthal σ contrast for T < 1500°C. The anisotropic results are combined to create an isotropic model with Ea = 0.53 eV.
Du Frane Wyatt L.
Roberts Jeffery J.
Toffelmier Daniel A.
Tyburczy James A.
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