Synthesis of Platelike {100} SrTiO3 Particles by Topochemical Microcrystal Conversion and Fabrication of Grain-Oriented Ceramics

Platelike SrTiO 3 particles with a cubic perovskite structure were synthesized by topochemical microcrystal conversion (TMC) from platelike precursor particles of layer-structured SrBi 4 Ti 4 O 15 at 950 °C. SrTiO 3 particles preserved the shape of precursor particles, and had a thickness of approximately 0.5 µm and a width of 5–10 µm. X-ray diffraction analysis revealed that in the TMC reaction, the crystallographic {001} plane of SrBi 4 Ti 4 O 15 is converted into the {100} plane of SrTiO 3 . Using the platelike SrTiO 3 particles as a template in templated grain growth method, dense {100} grain-oriented SrTiO 3 ceramics having a {100} orientation degree (Lotgering's factor) higher than 91% could be fabricated at sintering temperatures between 1350 and 1550 °C. The maximum orientation factor reached 99.3%.