[10a-PA4-1~10] 9.1 Dielectrics, ferroelectrics

▼ [10a-PA4-4] Fabrication of textured (Bi_0.5K_0.5)TiO₃ piezoelectric ceramics via conventional sintering method

〇(D)Gopal Prasad Khanal¹, Ichiro Fujii¹, Sangwook Kim¹, Shintaro Ueno¹, Tohru S. Suzuki², Satoshi Wada¹ (1.Univ. of Yamanashi, 2.NIMS)

Keywords:Grain-oriented, (Bi0.5K0.5)TiO3 Piezoelectric, Conventional Sintering

In this study, we focused on optimization of preparation conditions for the synthesis of <100>-oriented BKT ceramics via conventional sintering, using HTO-Bi₂O₃-KHCO₃ and HTO-TiO₂-Bi₂O₃-KHCO₃ reaction system, where HTO refers to plate-like H_1.08Ti_1.73O₄.nH₂O template particles with uniform-morphology and high aspect ratio. The matrix TiO₂ particles were used in the second reaction system beside the HTO template particles because the ratio of the matrix to the template particles strongly affects the grain orientation of the RTGG-processed ceramics. The grain-orientation imparted by the <100>-oriented BKT mesocrystal particles to other BKT-based solid solutions, with crystal symmetry other than tetragonal, could yield significant properties enhancement due to domain engineering.