Preparation of Grain-oriented Ceramics with Bismuth Potassium Titanate-Barium Titanate and their Piezoelectric Properties

摘要

Bismuth potassium titanate ((Bi_(1/2)K_(1/2))TiO_3: BKT) powder were prepared using bismuth oxide (Bi_2O_3), potassium hydrogen carbonate (KHCO_3) and titanium oxide (TiO_2) raw materials. Barium titanate (BaTiO_3: BT) platelike particles oriented along [110] direction were used as template particles. Barium titanate-bismuth potassium titanate (BT-BKT) ceramics had a tetragonal phase at -100 °C. The main composition was fixed to BKT 30 molar% because the Curie temperature (T_c) was well above 200 °C at BKT 30 molar%. The orientation of [110]-oriented BT-BKT ceramics (BKT 30 molar%) was 54.6 %.