Solvothermal Synthesis of Potassium Niobate/Barium Titanate Nanocomplex Ceramics with Three-Dimensionally Connected Structure-Gradient Region

抄録

The KN/BT nanocomplex ceramics with the necking structure were prepared by the solvothermal method to improve dielectric properties and piezoelectric response of barium titanate (BaTiO₃, BT)-based ceramics by introducing a three-dimensionally connected structure-gradient region (3D-connected SGR). We attempted to form epitaxial potassium niobate (KNbO₃, KN) layers on the sintered BT particle compacts with the necking structure by the solvothermal method at the various temperatures. The presence of the 3D-connected SGR in the KN/BT nanocomplex ceramics is suggested by the XRD measurement and the maximal dielectric constant of 1640 (at 1 MHz) and the maximal apparent piezoelectric constant, d₃₃^*, of 430 pm/V (at 0.1 Hz) were recorded for the KN/BT nanocomplex ceramics prepared at 200 °C. The introduction of the 3D-connected SGR is possible to contribute to the enhancement in the dielectric properties and the piezoelectric responses.