Phase content and dielectrical properties of sintered BaSrTiO ceramics prepared by a high temperature hydrothermal technique

摘要

Ba_xSr_(1-x)TiO_3 ceramic powders with varying barium content were prepared by a high temperature hydrothermal technique and sintered at 1300 deg C for 1-8 h. Their dielectrical, phase and structural properties were investigated. It was computed from the XRD spectra that the samples with a small amount of strontium, no more than 10 percent of the initial Ba:Sr share, had a single phase structure with x = 0.77-0.79 and Curie point T_c = 37-53 deg C. Samples with a higher initial Sr ratio developed a two-phase structure and two Curie points. T_c(x) dependence showed that all the experimental data followed a linear trend and were close to the values obtained from the conventional solid state technique, while the dielectric constant was almost one order of magnitude smaller.