Electric and dielectric properties of forsterite between 400 and 900°C

Details Electric and dielectric properties of forsterite between 400 and 900°C Electric and dielectric properties of forsterite between 400 and 900°C

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...23...98a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 23, Issue 2, p. 98-102.

Physics

3

Scientific paper

The electrical impedance of a sintered forsterite sample containing 1 mol percent SiO2 in excess has been studied as a function of frequency (1-105 Hz) and temperature (400-900°C). The electrical properties are strongly frequency-dependent, requiring both conduction and displacement current for their interpretation. The electrical conductivity is thermally activated with a mean activation energy of 1.15 eV. It is interpreted as being ionic and caused by migration of magnesium ions via a vacancy mechanism. Dielectric data deduced from impedance measurements vary as ωn-1 (0 < n < 1) at constant temperature. The value of n is different below and above a critical frequency ωc, which is thermally activated and interpreted as the jump frequency of the migrating species.

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