Abstract
Measurements of the dielectric properties of mica normal to the cleavage planes with platinum, silver and graphite electrodes are reported, we believe for the first time in the frequency range 0.01 to 10 000 Hz at fixed temperatures in the range up to 956 K. At high temperatures and low frequencies volume transport is observed giving rise to electrode-independent low frequency dispersion (LFD) in which both the real and imaginary components of the complex permittivity vary nearly inversely with frequency. This differs from conventional direct current transport in that a large amount of charge is stored in the system. The activation energy is approximately 2 eV. This is followed at higher frequencies by a volume loss peak which is associated with imperfections in the mica. At still higher frequencies and lower temperatures a loss peak appears, with a high-frequency power-law dependence with an exponent of approximately −0.3 to −0.6, depending on the nature of the electrodes. This is interpreted as a projection to higher frequencies of an electrode-related polarisation process in series with the low-loss interior of the mica sample.
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Chaudhry, M.A., Jonscher, A.K. High-temperature dielectric properties of ruby mica perpendicular to the cleavage planes. J Mater Sci 23, 208–216 (1988). https://doi.org/10.1007/BF01174055
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DOI: https://doi.org/10.1007/BF01174055