Low temperature hydrothermal synthesis and sintering of Ba _0.6Sr_0.4TiO₃

Ba_0.6Sr_0.4TiO₃ nanopowders (∼ 80 nm in size) were prepared by low temperature hydrothermal process. The process and synthesis mechanism were discussed in detail. Furthermore, the powders were pressed into disc-shaped pellets and sintered at different temperatures. The frequency dependence of the dielectric constant and loss angle tangent of the sintered BST ceramics are measured from room temperature to 500°C and a diffuse dielectric anomaly by the dielectric relaxation was found.