Preparation and properties of BaZrxTi1-xO3 ceramics

Abstract:

A series of BaZr_xTi_1-xO₃(x = 0.05, 0.1, 0.15, 0.2) ceramics were prepared by solid-state reaction. The effect of Zr content in BaTiO₃ system on the structure, phase composition, dielectric and ferroelectric properties had been investigated. The results showed that all samples were found to crystallize in the perovskite single phase, without any second phase. The SEM pictures showed that the grain size increased obviously with the increasing of Zr content, which acted as a grain growth promotor. The dielectric constants were affected by the doping level of Zr, and increased to the maximum of 4900 for the sample of x = 0.15 at 3 MHz. In addition to the sample of x = 0.15, the remnant polarization of other ceramics was decreased with the increase of Zr content, while the coercive field increased. There was the tendency of increase the leakage current with the increase of Zr, which leaded to the deterioration of the ferroelectric properties.