Characterization of the granular ceramic materials corundum and mullite by impedance spectroscopy
article
The granular ceramic materials corundum and mullite are potential filter bed materials for electrically enhanced filtration at elevated temperatures. The dielectric response of the granular ceramics has been determined at temperatures between 420 and 920 K. It is shown that the response of these materials can be described by one equivalent circuit over the whole temperature and frequency (0.1 Hz-10 kHz) range. Thermally activated conduction in parallel with a dipole relaxation with a symmetrical logarithmic distribution of relaxation times (Cole-Cole relaxation) is the mechanism which determines the response at not too low frequencies. © 1991 Chapman and Hall Ltd.
TNO Identifier
231414
ISSN
00222461
Source
Journal of Materials Science, 26(15), pp. 4086-4091.
Pages
4086-4091
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