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Electrical conductivity of H-bearing orthopyroxene single crystals measured with impedance spectroscopy

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Abstract

In this study, the electrical conductivity of synthetic and natural orthopyroxene single crystals containing various amounts of hydrogen and cation impurities (i.e., Al, Fe) was investigated using impedance spectroscopy. A new cell was developed to measure conductivities of submillimeter-sized oriented single crystals with impedances up to 1010 Ohm. In contrast to previous studies on olivine and orthopyroxene, results from this study do not show a simple correlation of the concentration of protons and the electrical conductivity. Instead, the electrical conductivity appears to be a complex function of iron content, hydrogen content, crystal orientation and concentration of other impurity cations and shows similar activation energies to hydrogen diffusion. Model calculations considering proton conduction rather exclude than suggest orthopyroxene as responsible phase for high-conductivity regions in the Earth’s upper mantle.

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Acknowledgments

The project was funded by the German Science Foundation (DFG grants STA645/4-1,2 und BE1720/18-1,2).

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Authors and Affiliations

  1. Experimental and Applied Mineralogy, Geoscience Center University of Göttingen, Goldschmidtstraße 1, 37077, Göttingen, Germany

    Elke Schlechter

  2. Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52f, 6020, Innsbruck, Austria

    Roland Stalder

  3. Institute of Mineralogy, University of Hannover, Callinstraße 3, 30167, Hannover, Germany

    Harald Behrens

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  1. Elke Schlechter
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  2. Roland Stalder
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  3. Harald Behrens
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Correspondence to Roland Stalder.

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Schlechter, E., Stalder, R. & Behrens, H. Electrical conductivity of H-bearing orthopyroxene single crystals measured with impedance spectroscopy. Phys Chem Minerals 39, 531–541 (2012). https://doi.org/10.1007/s00269-012-0509-9

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  • DOI: https://doi.org/10.1007/s00269-012-0509-9

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