We report on electrical resistivity versus temperature from 50 K down to 1.5 K of PtAl2O3 and AuAl2O3 cermets. When the metal volume fraction q is below the percolation threshold qc, the dc conductivity shows a temperature dependence of the form ln σ ∝ T−n which is usually related to...

Optical and electrical properties of inhomogeneous media, strongly depend on the percolating properties of one of the component. In many cases, inhomogeneous media present fractal structures near and at the percolation threshold, and in general, transport properties exhibit a very special...

The optical and electrical properties of metal-dielectric composites (cermets) show large variations as a function of volume fraction, size, shape and the statistical distribution of metallic grains in the dielectric. The flexibility of the optical properties around the percolation threshold can...