| 研究課題/領域番号 |
21F21704
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| 配分区分 | 補助金 |
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| 研究機関 | 九州大学 |
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研究代表者 |
陳 強 九州大学, 工学研究院, 教授 (30264451)
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| 研究分担者 |
XIE SHAOXIONG 九州大学, 工学(系)研究科(研究院), 外国人特別研究員
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| 研究期間 (年度) |
2021-11-18 – 2024-03-31
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| キーワード | Bismuth titanate / Atomic arrangement / Domain walls / Piezoelectric responses / Spatial model |
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| 研究実績の概要 |
The atomic-scale microstructural feature of bismuth titanate high temperature ceramics was investigated, directly revealing the atomic arrangement in layered perovskite structure of Aurivillius phase. Subsequently, we initially probed the domain structures in bismuth titanate piezoceramics. The transmission electron microscopy (TEM) experimental results show that there mainly exist (110)-type 90 degree domain walls in bismuth titanate ceramics. These domain walls were further examined by three dimensional piezoresponse force microscopy (3D PFM) experiments. Finally, a spatially visualized model of (110)-type 90 degree domain walls was established according to the specific piezoelectric responses of ferroelectric variants under multiple 3D PFM modes.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The PFM- and TEM samples were well prepared as planned. Due to well-understanding the knowledge of PFM operation and TEM observation, the crystal structure and domain structure of bismuth titanate high temperature ceramics have been investigated initially. The research findings are summarizing and preparing for writing a paper to submit it to an international journal. As a whole, the research goals as planned have been achieved, and the research progress is partially in advance.
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| 今後の研究の推進方策 |
Previous research, to some extent, has revealed general domain structure in pure bismuth titanate high temperature ceramics by PFM probing and TEM observation. To further elaborate the domain structure of the ceramic, we will investigate ferroelectric domain and ion displacement at atomic-scale by using high resolution TEM and scanning TEM combined with two dimensional Gaussian Fitting technique. In addition, the polarization switching of bismuth titanate high temperature ceramics will also be investigated by micro-poling engineering under an external electric field and a conductive PFM probe, respectively, to initially unravel the polarization switching mechanism and attempt to establish the spatial model of polarization dynamics.
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