[16p-A409-1~17] 6.1 Ferroelectric thin films

△ [16p-A409-3] Ferroelectric properties of (Bi,K)TiO₃-CaTiO₃ solid solution thin films prepared by a hydrothermal method

〇(M1)Taichi Murashita¹, Yuxian Hu¹, Yuma Takahashi¹, Reika Ota¹, Kazuki Okamoto¹, Hiroshi Funakubo¹ (1.Tokyo Tech.)

Keywords:Ferroelectric material, Hydrothermal Method, Pyroelectric material

(Bi, K)TiO₃ was first reported by Smolenskii et al. in 1959, but has not been fully investigated due to the difficulty in preparing high-quality samples. Our group succeeded in preparing high-quality (Bi, K)TiO₃ thin films with polarization axis orientation by hydrothermal synthesis in 2020,. Furthermore, (Bi, K)TiO₃-(Bi, Na)TiO₃ solid solution thin films were successfully prepared, suggesting the existence of MPB. In this study, we report on the preparation of (Bi, K)TiO₃ and CaTiO₃ solid solution thin films, attempts to lower the T_c, and evaluation of the ferroelectric properties of the films.