| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4741682 | Physics of the Earth and Planetary Interiors | 2014 | 4 Pages |
•Electrical conductivity of hydrated olivine decreases with oxygen fugacity.•Conduction by the most abundant defect is inconsistent with this observation.•Conduction by minor defect is consistent with this observation.
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.
