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Title: Anisotropy of electrical conductivity in dry olivine

Abstract

[1] The electrical conductivity ({sigma}) was measured for a single crystal of San Carlos olivine (Fo{sub 89.1}) for all three principal orientations over oxygen fugacities 10{sup -7} < fO{sub 2} < 10{sup 1} Pa at 1100, 1200, and 1300 C. Fe-doped Pt electrodes were used in conjunction with a conservative range of fO{sub 2}, T, and time to reduce Fe loss resulting in data that is {approx}0.15 log units higher in conductivity than previous studies. At 1200 C and fO{sub 2} = 10{sup -1} Pa, {sigma}{sub [100]} = 10{sup -2.27} S/m, {sigma}{sub [010]} = 10{sup -2.49} S/m, {sigma}{sub [001]} = 10{sup -2.40} S/m. The dependences of {sigma} on T and fO{sub 2} have been simultaneously modeled with undifferentiated mixed conduction of small polarons and Mg vacancies to obtain steady-state fO{sub 2}-independent activation energies: Ea{sub [100]} = 0.32 eV, Ea{sub [010]} = 0.56 eV, Ea{sub [001]} = 0.71 eV. A single crystal of dry olivine would provide a maximum of {approx}10{sup 0.4} S/m azimuthal {sigma} contrast for T < 1500 C. The anisotropic results are combined to create an isotropic model with Ea = 0.53 eV.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
877839
Report Number(s):
UCRL-JRNL-211347
Journal ID: ISSN 0094-8276; GPRLAJ; TRN: US0601709
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 32; Journal Issue: 24; Journal ID: ISSN 0094-8276
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANISOTROPY; ELECTRIC CONDUCTIVITY; ELECTRODES; MONOCRYSTALS; OLIVINE; OXYGEN; POLARONS; VACANCIES

Citation Formats

Du Frane, W L, Roberts, J J, Toffelmier, D A, and Tyburczy, J A. Anisotropy of electrical conductivity in dry olivine. United States: N. p., 2005. Web. doi:10.1029/2005GL023879.
Du Frane, W L, Roberts, J J, Toffelmier, D A, & Tyburczy, J A. Anisotropy of electrical conductivity in dry olivine. United States. https://doi.org/10.1029/2005GL023879
Du Frane, W L, Roberts, J J, Toffelmier, D A, and Tyburczy, J A. 2005. "Anisotropy of electrical conductivity in dry olivine". United States. https://doi.org/10.1029/2005GL023879. https://www.osti.gov/servlets/purl/877839.
@article{osti_877839,
title = {Anisotropy of electrical conductivity in dry olivine},
author = {Du Frane, W L and Roberts, J J and Toffelmier, D A and Tyburczy, J A},
abstractNote = {[1] The electrical conductivity ({sigma}) was measured for a single crystal of San Carlos olivine (Fo{sub 89.1}) for all three principal orientations over oxygen fugacities 10{sup -7} < fO{sub 2} < 10{sup 1} Pa at 1100, 1200, and 1300 C. Fe-doped Pt electrodes were used in conjunction with a conservative range of fO{sub 2}, T, and time to reduce Fe loss resulting in data that is {approx}0.15 log units higher in conductivity than previous studies. At 1200 C and fO{sub 2} = 10{sup -1} Pa, {sigma}{sub [100]} = 10{sup -2.27} S/m, {sigma}{sub [010]} = 10{sup -2.49} S/m, {sigma}{sub [001]} = 10{sup -2.40} S/m. The dependences of {sigma} on T and fO{sub 2} have been simultaneously modeled with undifferentiated mixed conduction of small polarons and Mg vacancies to obtain steady-state fO{sub 2}-independent activation energies: Ea{sub [100]} = 0.32 eV, Ea{sub [010]} = 0.56 eV, Ea{sub [001]} = 0.71 eV. A single crystal of dry olivine would provide a maximum of {approx}10{sup 0.4} S/m azimuthal {sigma} contrast for T < 1500 C. The anisotropic results are combined to create an isotropic model with Ea = 0.53 eV.},
doi = {10.1029/2005GL023879},
url = {https://www.osti.gov/biblio/877839}, journal = {Geophysical Research Letters},
issn = {0094-8276},
number = 24,
volume = 32,
place = {United States},
year = {Wed Apr 13 00:00:00 EDT 2005},
month = {Wed Apr 13 00:00:00 EDT 2005}
}

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