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Electrical conductivity (sigma_dc) of the cellular Si/SiC ceramic compositeshas been measured over a temperature range 25-1073 K while the thermoelectricpower (S) has been measured over 25-300 K. Remarkably, these cellular compoundsdeveloped through biomimetic route - where the ceramic system grows within aplant bio-template retaining the structural intricacies of the native templates- are found to exhibit excellent mechanical, thermal, and electrical propertiesquite comparable to or even better than those of the systems prepared throughconventional ceramic route. The electrical conductivity measured parallel(sigma||) and perpendicular (sigma+) to the growth axes of the native plants,depicts nearly temperature-independent anisotropy (sigma+/sigma||) of the order\~2 while the thermoelectric power is nearly isotropic. The charge conductionacross the entire temperature range is found to follow closely the variablerange hopping (VRH) mechanism. The conductivity anisotropy appears to be drivenprimarily by the unique microcellular morphology of the bio-templates which canbe exploited in many electrical applications.Comment: 22 pages including 6 figures; pdf only; submitted to J. Appl. Phy

Electrical conductivity of cellular Si∕SiC ceramic composites prepared from plant precursors