Volume 33 Issue 6
Nov 2019
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TIAN Haoran, XU Liangxu, LI Nana, ZHANG Qian, LIN Junfu, LIU Jin. High-Pressure Electrical Conductivity of Single-Crystal Olivine[J]. Chinese Journal of High Pressure Physics, 2019, 33(6): 060103. doi: 10.11858/gywlxb.20190775
Citation: TIAN Haoran, XU Liangxu, LI Nana, ZHANG Qian, LIN Junfu, LIU Jin. High-Pressure Electrical Conductivity of Single-Crystal Olivine[J]. Chinese Journal of High Pressure Physics, 2019, 33(6): 060103. doi: 10.11858/gywlxb.20190775

High-Pressure Electrical Conductivity of Single-Crystal Olivine

doi: 10.11858/gywlxb.20190775
  • Received Date: 13 May 2019
  • Rev Recd Date: 18 Jun 2019
  • Issue Publish Date: 01 Dec 2019
  • The electrical conductivity of single-crystal San Carlos olivine was measured up to 19 GPa at room temperature in a diamond-anvil cell, coupled with a complex impedance spectroscopy. The pressure was determined by in-situ ruby luminescence and Raman shift of silicone fluid. We found that the electrical conductivity along [100] is largest, increasing approximately from 3.8×10–8 S/m at 0 GPa to 9.0×10–8 S/m at 18 GPa at room temperature. The conductivity along [010] is comparable to that of [001], approximately as 1/2 to 1/3 as that of [100]. Furthermore, the conductivity linearly increases with the pressure, while it changes faster with the pressure along [100] than that of [010] and [001]. At room temperature, the charge transport mechanism of olivine is dominant from the Fe2+–Fe3+ (small polarons) with a negative activation volume. The present results suggest that the pressure effect could lead to larger lateral and vertical heterogeneity in electrical conduction for a dry upper mantle.

     

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