Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling
文献类型：期刊论文
| 作者 | Zhang, SR; Guo, XW; Tang, YL; Ma, DS; Zhu, YL; Wang, YJ; Li, S; Han, MJ; Chen, D; Ma, JY |
| 刊名 | ACS NANO
 |
| 出版日期 | 2018-04-01 |
| 卷号 | 12期号:4页码:3681-3688 |
| 关键词 | Electromechanical Response Solid-solution Pbtio3 Films Thin-films Phase Enhancement Crystals Origin Fields Oxides |
| ISSN号 | 1936-0851 |
| 英文摘要 | Multiple polar states and giant piezoelectric responses could be driven by polarization rotation in ferroelectric films, which have potential functionalities in modern material applications. Although theoretical calculations have predicted polarization rotation in pure PbTiO3 films without domain walls and strains, direct experiment has rarely confirmed such polar states under this condition. Here, we observed that interfacial oxygen octahedral coupling (OOC) can introduce an oxygen octahedral rotation, which induces polarization rotation in single domain PbTiO3 films with negligible strains. We have grown ultrathin PbTiO3 films (3.2 nm) on both SrTiO3 and Nb:SrTiO3 substrates and applied aberration-corrected scanning transmission electron microscopy (STEM) to study the interfacial OOC effect. Atomic mappings unit cell by unit cell demonstrate that polarization rotation occurs in PbTiO3 films on both substrates. The distortion of oxygen octahedra in PbTiO3 is proven by annular bright-field STEM. The critical thickness for this polarization rotation is about 4 nm (10 unit cells), above which polarization rotation disappears. First-principles calculations manifest that the interfacial OOC is responsible for the polarization rotation state. These results may shed light on further understanding the polarization behavior in ultrathin ferroelectrics and be helpful to develop relevant devices as polarization rotation is known to be closely related to superior electromechanical responses.; Multiple polar states and giant piezoelectric responses could be driven by polarization rotation in ferroelectric films, which have potential functionalities in modern material applications. Although theoretical calculations have predicted polarization rotation in pure PbTiO3 films without domain walls and strains, direct experiment has rarely confirmed such polar states under this condition. Here, we observed that interfacial oxygen octahedral coupling (OOC) can introduce an oxygen octahedral rotation, which induces polarization rotation in single domain PbTiO3 films with negligible strains. We have grown ultrathin PbTiO3 films (3.2 nm) on both SrTiO3 and Nb:SrTiO3 substrates and applied aberration-corrected scanning transmission electron microscopy (STEM) to study the interfacial OOC effect. Atomic mappings unit cell by unit cell demonstrate that polarization rotation occurs in PbTiO3 films on both substrates. The distortion of oxygen octahedra in PbTiO3 is proven by annular bright-field STEM. The critical thickness for this polarization rotation is about 4 nm (10 unit cells), above which polarization rotation disappears. First-principles calculations manifest that the interfacial OOC is responsible for the polarization rotation state. These results may shed light on further understanding the polarization behavior in ultrathin ferroelectrics and be helpful to develop relevant devices as polarization rotation is known to be closely related to superior electromechanical responses. |
| 学科主题 | Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary |
| 语种 | 英语 |
| 资助机构 | National Natural Science Foundation of China [51571197, 51501194, 51671194, 51401212, 11627801]; National Basic Research Program of China [2014CB921002]; Key Research Program of Frontier Sciences CAS [QYZDJ-SSW-JSC010]; Youth Innovation Promotion Association CAS [2016177]; National Key Research Program of China [2016YFA0201001]; IMR SYNL-T.S. Ke Research Fellowship [2016177] |
| 公开日期 | 2018-06-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79384]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Zhu, YL; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China.; Ma, XL (reprint author), Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Zhang, SR,Guo, XW,Tang, YL,et al. Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling[J]. ACS NANO,2018,12(4):3681-3688. |
| APA | Zhang, SR.,Guo, XW.,Tang, YL.,Ma, DS.,Zhu, YL.,...&Ma, XL .(2018).Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling.ACS NANO,12(4),3681-3688. |
| MLA | Zhang, SR,et al."Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling".ACS NANO 12.4(2018):3681-3688. |
入库方式： OAI收割
来源：金属研究所
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