Presentation Information
[8a-F212-3]Tetragonality Dependence of Tc in (1-x)(Bi0.5K0.5)TiO3-xBaTiO3 Solid Solutions
〇Takumi Hosoya1, Fu Desheng1,2,3 (1.GSIST, Shizuoka Univ, 2.Fac.Eng.Shizuoka Univ, 3.GSST, Shizuoka Univ)
Keywords:
piezoelectric,(Bi0.5K0.5)TiO3-BaTiO3,ferroelectric
BaTiO3 (BTO) is a representative ferroelectric material; however, its relatively low Curie temperature (Tc) of approximately 400 K limits its use in high-temperature applications. In contrast, (Bi0.5K0.5)TiO3 (BKT) is a promising lead-free piezoelectric material with a high Tc of approximately 600 K, but its sintering and densification are difficult. In this study, high-density (1-x)BKT-xBTO (x = 0~1) ceramics were fabricated using the spark plasma sintering (SPS) method, and their structural and physical properties were investigated. As a result, specimens with relative densities exceeding 95% were successfully obtained, and a linear relationship between Tc and the tetragonal distortion (c/a) was found. These results demonstrate that Tc can be tuned through lattice structure control in this material system.