Bismuth titanate-based high temperature piezoceramics: Domain structure and polarization dynamics

钛酸铋基高温压电陶瓷：磁畴结构和极化动力学

• 批准号: 22KF0290
• 负责人: 陳 強
• 金额: $ 1.41万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22KF0290/
• 关键词: Bismuth titanite; Atomic observations; Domain walls; Polarization shift; Domain switching; Bismuth titanate; Atomic arrangement; Piezoelectric responses; Spatial model

Domain structures in BIT perovskite piezoelectrics were probed by PFM and TEM techniques. The TEM experimental results show that there mainly exist (110)-type 90 degree domain walls in the pure BIT ceramics. However, for the doped BIT ceramics, numerous (001)-type 180 degree domain walls appear on the lateral planes of grains. These domain walls were further examined by 3D PFM experiments, whose spatially visualized models were successfully established combined with the atomic observations of ion displacement and polarization shift via STEM. In addition, the polarization switching of BIT ceramics was initially investigated by a conductive PFM probe, which reveals the independent switching behaviors of polarization vector along a-axis and c-axis of unit cell.

利用PFM和TEM技术对BIT钙钛矿压电材料的畴结构进行了研究。TEM实验结果表明，纯BIT陶瓷中主要存在（110）型90度畴壁。然而，对于掺杂的BIT陶瓷，晶粒的横向面上出现了大量的（001）型180度畴壁。通过三维PFM实验，结合STEM对离子位移和极化位移的原子观测，成功地建立了空间可视化模型。此外，利用导电PFM探针对BIT陶瓷的极化开关进行了初步研究，揭示了偏振矢量沿晶胞a轴和c轴的独立开关行为。

项目成果

In-depth understanding of {110}-type domain walls in bismuth titanate ceramics

• DOI: 10.1016/j.scriptamat.2022.114793
• 发表时间: 2022-08
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Shaoxiong Xie;Jikai Shi;Qian Xu;Qingyuan Wang;Jianguo Zhu;Y. Sato;Qiang Chen