DC bias properties of Ba(Ti1-xZrx)O3 ceramics

The effects of DC bias fields on the dielectric properties of Ba(Ti1-xZrx)O-3 (BTZ) ceramics were investigated. BTZ ceramics exhibited fine DC bias properties. Frequency dispersion and diffusion phase transition were found in BTZ ceramics, whereas the temperature T-m which corresponding to the maximum dielectric constant showed little dependence on the testing frequency. The dielectric constant increased at first and then decreased with the increase of DC bias at the temperature T-m. At temperatures far from T-m the dielectric constant showed a continuous decreasing tendency. The dielectric loss of the ceramics was small and decreased with increasing DC bias at room temperature. The related mechanism was also discussed. (C) 2002 Elsevier Science B.V. All rights reserved.