Correlation between depolarization temperature and lattice distortion in quenched (Bi1/2Na1/2)TiO3-based ceramics

被引：40
|
作者：
Nagata, Hajime [1 ]
Takagi, Yuka [1 ]
Yoneda, Yasuhiro [2 ]
Takenaka, Tadashi [1 ]
机构：
[1] Tokyo Univ Sci, Fac Sci & Technol, Dept Elect Engn, Noda, Chiba 2788510, Japan
[2] Japan Atom Energy Agcy, React Dynam Res Div, Sayo, Hyogo 6795148, Japan
来源：
APPLIED PHYSICS EXPRESS | 2020年 / 13卷 / 06期
基金：
日本学术振兴会;
关键词：
lead-free piezoelectric ceramics; bismuth sodium titanate; depolarization temperature; quench; rhombohedral distortion; TRANSMISSION ELECTRON-MICROSCOPY; PHASE-TRANSITION TEMPERATURES; PIEZOELECTRIC PROPERTIES; 3-DIMENSIONAL VISUALIZATION; SYSTEM;
D O I：
10.35848/1882-0786/ab8c1d
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
(Bi1/2Na1/2)TiO3 (BNT) is one of the candidates for lead-free piezoelectric ceramics. Recently, we found that the depolarization temperature T-d of BNT could be increased by approximately 40 degrees C-80 degrees C with a quenching treatment after the sintering. To elucidate the mechanism, high-energy synchrotron X-ray powder diffraction data were collected in SPring-8 to analyze their crystal structures in detail. In the case of a quenched BNT-based sample, Bi ions displaced more to the off-center position of the A-site in a perovskite structure with a more ordered structure. The increase in rhombohedral distortion then affects the T-d elevation in the quenched sample.
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页数：5
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