Solvothermal preparation of potassium niobate/barium titanate nanocomplex ceramics with three dimensional network-configuration of structure-gradient region and their dielectric properties

摘要

To improve dielectric properties of barium titanate (BaTiO_3, BT)-based ceramics, the BT/ potassium niobate (KNbO_3, KN) nanocomplex ceramics were designed to expect the formation of a three dimensional network-configuration of a structure-gradient region (SGR), where the polar vector can easily rotate. The KN epitaxial nanolayers were formed on BT compacts with a necking structure by a solvothermal method and the maximal dielectric constant of 1450 and the relatively large apparent piezoelectric constant d_(33)* of 318 pm/V were recorded for the KN/BT nanocomplex ceramics. The experimental facts suggest that the configuration of the SGR, in addition to the relative density, is one of the important factors to enhance the dielectric properties of the KN/BT nanocomplex ceramics.