Various mechanisms of hydrogen-assisted electrical conductivity predict different dependence of conductivity on oxygen fugacity. If a majority of hydrogen-related defects (i.e., two protons at M-site) carries the electrical current, then the conductivity will be independent of oxygen fugacity, whereas if a minority defect such as free proton carries the electrical conductivity, then the electrical conductivity will decrease with oxygen fugacity. We have determined the dependence of hydrogen-assisted electrical conductivity on oxygen fugacity in hydrous olivine. We found that the hydrogen-assisted electrical conductivity in olivine decreases with oxygen fugacity. This result supports a model where hydrogen-related defect with minor concentration (e.g., free proton or one hydrogen at M-site) carries most of the electric charge. (C) 2014 Elsevier B.V. All rights reserved. TEst Publication name | PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 232 57-60; 10.1016/j.pepi.2014.04.003 JUL 2014 | Author(s) | Dai, Lidong; Karato, Shun-ichiro | Corresponding author | Karato, Shun-ichiro shun-ichiro.karato@yale.edu Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06511 USA. | Author(s) from IGCAS | DAI Lidong | View here for the details
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