[15a-D215-1~9] 9.1 Dielectrics, ferroelectrics

△ [15a-D215-6] Structural phase transition of BaTiO₃ octahedral crystal

〇(B)Kosuke Shirakawa¹, Nagise Fukushima¹, Sangwook Kim¹, Hyunwook Nam², Ichiro Fujii², Shintaro Ueno², Satoshi Wada², Yoshihiro Kuroiwa¹ (1.Hiroshima Univ., 2.Univ. of Yamanashi)

Keywords:dielectric, ferroelectric

Normally, BaTiO₃ undergoes a sequential phase transition from high-temperature cubic to ferroelectric phase in the order of tetragonal, orthorhombic, and rhombidal crystals.However, BaTiO₃ octahedral crystals don't have clearly tetragonal or orthorhombic phase .Phase transitions occur over a wide temperature range and appear to be structural phase transitions to rhombhedral crystals.