Microstructure and dielectric properties of textured SrTiO₃ ceramics

Textured SrTiO₃ ceramics were prepared by reactive template grain growth (RTGG) technique combined with tape-casting process, in which plate-like particles of SrTiO₃ (ST) were used as templates and Bi₂O₃ doped SrTiO₃ particles prepared by solid state reaction method were used as matrix. The effect of sintering process parameters on the microstructures and dielectric properties of textured SrTiO₃ ceramics were investigated. The results show that the orientation of the grain grew along (100) plane in textured SrTiO₃ ceramics. The texture fraction increased with increasing the sintering temperatures and the soaking times. Textured SrTiO₃ ceramics with the maximum orientation degree of 0.56 were achieved after sintering at 1550°C for 16 h. The dielectric constant increased with increasing the texture fraction and showed anisotropic dielectric properties at the directions perpendicular and parallel to the tape-casting.