High temperature a.c. electrical properties of olivine single crystal with varying oxygen partial pressure: implications for the point defect chemistry

Details High temperature a.c. electrical properties of olivine single crystal with varying oxygen partial pressure: implications for the point defect chemistry High temperature a.c. electrical properties of olivine single crystal with varying oxygen partial pressure: implications for the point defect chemistry

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...41..269s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 41, Issue 4, p. 269-282.

Physics

27

Scientific paper

The electrical conductivity and dielectric constant of a natural olivine single crystal were measured as a function of frequency over 0.1-1000 Hz. The measurements were made at temperatures of 1000-1400°C under a controlled oxygen partial pressure that was varied within the range of the olivine stability field. The observed dielectric constant of olivine increased with increasing oxygen pressure, and the change was greater at higher temperature and lower frequency. When the oxygen pressure Po2 was relatively high, the dielectric constants measured at 0.1 Hz were proportional to Po21/6. This observation can be interpreted as a polarization effect of magnesium vacancies that are partially blocked at the specimen electrodes. The conductivity value and the frequency dependence of the dielectric constant indicate that holes as well as magnesium vacancies contribute to electrical properties of olivine. At lower oxygen pressure, the conductivity and dielectric constant are less dependent on oxygen pressure, suggesting that magnesium interstitial ions and/or electrons also contribute to the electrical conduction in olivine.
Now at Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road, N.W. Washington, DC 20015, U.S.A.

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