Giant flexoelectric polarization in a micromachined ferroelectric diaphragm
The coupling between dielectric polarization and strain gradient, known as flexoelectricity, becomes significantly large on the micro- and nanoscale. Here, it is shown that giant flexoelectric polarization can reverse remnant ferroelectric polarization in a bent Pb(Zr0.52Ti0.48)O3 (PZT) diaphragm fa...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/102363 http://hdl.handle.net/10220/19015 |
| _version_ | 1811686646070902784 |
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| author | Zhu, Weiguang Wang, Zhihong Zhang, Xi Xiang Wang, Xianbin Yue, Weisheng Li, Jingqi Miao, Jianmin |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Zhu, Weiguang Wang, Zhihong Zhang, Xi Xiang Wang, Xianbin Yue, Weisheng Li, Jingqi Miao, Jianmin |
| author_sort | Zhu, Weiguang |
| collection | NTU |
| description | The coupling between dielectric polarization and strain gradient, known as flexoelectricity, becomes significantly large on the micro- and nanoscale. Here, it is shown that giant flexoelectric polarization can reverse remnant ferroelectric polarization in a bent Pb(Zr0.52Ti0.48)O3 (PZT) diaphragm fabricated by micromachining. The polarization induced by the strain gradient and the switching behaviors of the polarization in response to an external electric field are investigated by observing the electromechanical coupling of the diaphragm. The method allows determination of the absolute zero polarization state in a PZT film, which is impossible using other existing methods. Based on the observation of the absolute zero polarization state and the assumption that bending of the diaphragm is the only source of the self-polarization, the upper bound of flexoelectric coefficient of PZT film is calculated to be as large as 2.0 × 10−4 C m−1. The strain gradient induced by bending the diaphragm is measured to be on the order of 102 m−1, three orders of magnitude larger than that obtained in the bulk material. Because of this large strain gradient, the estimated giant flexoelectric polarization in the bent diaphragm is on the same order of magnitude as the normal remnant ferroelectric polarization of PZT film. |
| first_indexed | 2024-10-01T05:03:43Z |
| format | Journal Article |
| id | ntu-10356/102363 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:03:43Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1023632020-03-07T13:22:20Z Giant flexoelectric polarization in a micromachined ferroelectric diaphragm Zhu, Weiguang Wang, Zhihong Zhang, Xi Xiang Wang, Xianbin Yue, Weisheng Li, Jingqi Miao, Jianmin School of Electrical and Electronic Engineering School of Mechanical and Aerospace Engineering DRNTU::Engineering::Electrical and electronic engineering The coupling between dielectric polarization and strain gradient, known as flexoelectricity, becomes significantly large on the micro- and nanoscale. Here, it is shown that giant flexoelectric polarization can reverse remnant ferroelectric polarization in a bent Pb(Zr0.52Ti0.48)O3 (PZT) diaphragm fabricated by micromachining. The polarization induced by the strain gradient and the switching behaviors of the polarization in response to an external electric field are investigated by observing the electromechanical coupling of the diaphragm. The method allows determination of the absolute zero polarization state in a PZT film, which is impossible using other existing methods. Based on the observation of the absolute zero polarization state and the assumption that bending of the diaphragm is the only source of the self-polarization, the upper bound of flexoelectric coefficient of PZT film is calculated to be as large as 2.0 × 10−4 C m−1. The strain gradient induced by bending the diaphragm is measured to be on the order of 102 m−1, three orders of magnitude larger than that obtained in the bulk material. Because of this large strain gradient, the estimated giant flexoelectric polarization in the bent diaphragm is on the same order of magnitude as the normal remnant ferroelectric polarization of PZT film. 2014-03-27T09:01:47Z 2019-12-06T20:53:57Z 2014-03-27T09:01:47Z 2019-12-06T20:53:57Z 2013 2013 Journal Article Wang, Z., Zhang, X. X., Wang, X., Yue, W., Li, J., Miao, J., et al. (2013). Giant flexoelectric polarization in a micromachined ferroelectric diaphragm. Advanced Functional Materials, 23(1), 124-132. 1616-301X https://hdl.handle.net/10356/102363 http://hdl.handle.net/10220/19015 10.1002/adfm.201200839 en Advanced functional materials © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering Zhu, Weiguang Wang, Zhihong Zhang, Xi Xiang Wang, Xianbin Yue, Weisheng Li, Jingqi Miao, Jianmin Giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| title | Giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| title_full | Giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| title_fullStr | Giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| title_full_unstemmed | Giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| title_short | Giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| title_sort | giant flexoelectric polarization in a micromachined ferroelectric diaphragm |
| topic | DRNTU::Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/102363 http://hdl.handle.net/10220/19015 |
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