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arXiv 0810.3672cond-mat.mtrl-scicond-mat.other
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SrTiO3陶瓷室温表面压电性的压电响应力显微镜研究

Room temperature surface piezoelectricity in SrTiO3 ceramics via piezoresponse force microscopy

Andrei Kholkin, Igor Bdikin, Tetyana Ostapchuk, Jan Petzelt

摘要:

采用压电响应力显微镜对SrTiO_3陶瓷进行了研究。压电对比度观察抛光表面在垂直和横向制度,并取决于晶粒取向变化的符号(极化方向)和振幅。所观察到的对比度证明了由于表面弛豫引起的挠曲电效应(应变梯度诱导极化)的表面压电性。估计的挠曲电系数是约一个数量级较小的那些最近测得的SrTiO 3单晶相比。所观察到的增强的压电响应信号在晶界解释的偶极矩与不均匀分布的氧空位。

英文摘要:

SrTiO3 ceramics are investigated by piezoresponse force microscopy. Piezoelectric contrast is observed on polished surfaces in both vertical and lateral regimes and depends on the grain orientation varying in both sign (polarization direction) and amplitude. The observed contrast is attested to the surface piezoelectricity due to flexoelectric effect (strain gradient-induced polarization) caused by the surface relaxation. The estimated flexoelectric coefficient is approximately one order of magnitude smaller as compared to those recently measured in SrTiO3 single crystals. The observed enhancement of piezoresponse signal at the grain boundaries is explained by the dipole moments associated with inhomogeneous distribution of oxygen vacancies.

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