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.

通过 PFM 和 TEM 技术探测了 BIT 钙钛矿压电材料的畴结构。 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BIT陶瓷，晶粒的侧面出现大量(001)型180度畴壁。通过 3D PFM 实验进一步检查了这些畴壁，并结合 STEM 对离子位移和偏振偏移的原子观察，成功建立了空间可视化模型。此外，通过导电PFM探针初步研究了BIT陶瓷的偏振切换，揭示了偏振矢量沿晶胞a轴和c轴的独立切换行为。

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