[17a-P01-1~29] 9 Applied Materials Science (Poster)

[17a-P01-2] Differences in phase transition behavior in BNT-BT lead-free piezoelectric bulk ceramics and their ground powders

〇(B)Kanato Mizoguchi¹, Sangwook Kim¹, Zhuangkai Wang², Shintaro Ueno², Ichiro Fujii², Norihiro Oshime³, Kenji Ohwada³, Satoshi Wada², Yoshihiro Kuroiwa¹ (1.Hiroshima Univ., 2.Yamanashi Univ., 3.QST)

Keywords:

Ferroelectric,phase transition

We carried out synchrotron radiation x-ray diffraction experiments with BNT-BT lead-free ferroelectric bulk ceramics and their ground powders to investigate the crystal structure change associated with the ferroelectric phase transition temperature. The bulk sample showed discontinuous structural change. On the other hand, the powder sample showed a continuous structural change, and a tetragonal component was observed in addition to the cubic component at high temperature. This appears increase of the phase transition temperature. We discuss this difference in relation to other studies of ferroelectric materials with increase of phase transition temperatures.