The first all-ceramic percolative composites (composites comprising conductive filler distributed in a dielectric matrix) have been developed. Due to almost an ideal structure – conductive ceramic grains are uniformly distributed in a dielectric ceramic matrix – the dielectric response in the Pb(Zr,Ti)O3-Pb2Ru2O6.5 composite follows the predictions of the percolation theory and the dielectric constant reaches values as high as 40,000 at room temperature. Obtained results demonstrate the potential of the composite for use as high-dielectric-constant material in various applications.
COBISS.SI-ID: 21715751
Besides the first lead-based system we have developed also the first lead-free all-ceramic percolative composite, being important as lead represents a possible ecological hazard. Similarly as in the Pb(Zr,Ti)O3-Pb2Ru2O6.5 system, in the lead-free (K,Na)NbO3–RuO2 all-ceramic percolative composite the dielectric response also follows the predictions of the percolation theory due to an almost ideal structure and, concomitantly, values of the dielectric constant are as high as in the lead-based system.
COBISS.SI-ID: 22349863