Processing and Morphology of (111) BaTiO_3 Crystal Platelets by a Two-Step Molten Salt Method

摘要

The (111) oriented plate-like BaTiO_3 (BT) particles with a tetragonal perovskite structure and a stoichiometric composition were successfully synthesized by a two-step molten-salt synthesis method (MSS). The as-synthesized BT particles preserved the plate-like shape of precursor Ba_6Ti_(17)O_(40) (B6T17) particles with (001) major crystalline face, and, however, had a preferred pseudo-cubic (111) orientation. BT particle with a high aspect ratio (10-20 μm in diameter and <1.5 urn in thickness) was achieved as the soaking temperature and time were optimized to be 1170℃ and 5 h, respectively. Oriented particu-late layer X-ray diffraction analysis revealed that the crystallo-graphic (001) plane of B6T17 has a topotactic relation with the (111) plane of BT particles.