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The Effect of Water on Ionic Conductivity in Olivine

Fei,Hongzhan
Druzhbin,Dmitry
Katsura,Tomoo
DOI: https://doi.org/10.1029/2019JB019313
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9492
Fei,Hongzhan; Druzhbin,Dmitry; Katsura,Tomoo, 2020: The Effect of Water on Ionic Conductivity in Olivine. In: Journal of Geophysical Research: Solid Earth, Band 125, 3, DOI: 10.1029/2019JB019313.
 
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  • Abstract
High-temperature ionic conductivity in olivine single crystals has been measured in the [100], [010], and [001] crystallographic orientations as a function of pressure from 2 to 10 GPa, temperature from 1450 to 2180 K, and H2O content from 20 to 580 wt. ppm using multianvil presses with in situ impedance analyses. The experimental results yield an activation energy, activation volume, and H2O content exponent of 250–405 kJ/mol, 3.2–5.3 cm3/mol, and 1.3 ± 0.2, respectively, for the high-temperature ionic conduction regime. Olivine ionic conductivity has negative pressure and positive temperature dependences and is significantly enhanced by H2O incorporation. The [001] direction is more conductive than the [100] and [010] directions. The H2O-enhanced ionic conductivity may contribute significantly to the electrical conductivity profile in the asthenosphere, especially in the regions under relatively high-temperature and low-pressure conditions.
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  • Geochemie, Mineralogie, Petrologie [344]
Subjects:
ionic conductivity
olivine
water
asthenosphere
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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