The ionic conductivity in high-pressure polymorphs of calcite |
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| Authors: | M Ishikawa A Sawaoka M Ichikuni |
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| Institution: | 1. Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 227, Yokohama, Japan
2. Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 227, Yokohama, Japan
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| Abstract: | Ionic conductivity of polycrystalline calcite containing varying amounts of PO 4 3? ions was measured in the pressure range of 1–6 GPa and at room temperature. Electrical conductivity increased with pressure corresponding to the phase transition of calcite I to calcite II. The conductivity in calcite III decreased exponentially with pressure. Calculated activation volumes of the conductivity varied with PO 4 3? content in the range of 0.94–5.34 cm3/mol. This variation corresponded to the lattice parameter change of calcite I due to PO 4 3? incorporation and indicated the contribution of CO 3 2? -vacancies associated with PO 4 3? ions to the conductivity. |
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