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首页> 外文期刊>Advanced Functional Materials >The Contributions of Polar Nanoregions to the Dielectric and Piezoelectric Responses in Domain-Engineered Relaxor-PbTiO3 Crystals
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The Contributions of Polar Nanoregions to the Dielectric and Piezoelectric Responses in Domain-Engineered Relaxor-PbTiO3 Crystals

机译：极性纳米区域对畴工程弛豫-PbTiO3晶体中介电和压电响应的贡献

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摘要

The existence of polar nanoregions is the most important characteristic of relaxor-based ferroelectric materials. Recently, the contributions of polar nanoregions to the shear piezoelectric property of relaxor-PbTiO3 (PT) crystals are confirmed in a single domain state, accounting for 50%-80% of room temperature values. For electromechanical applications, however, the outstanding longitudinal piezoelectricity in domain-engineered relaxor-PT crystals is of the most significance. In this paper, the contributions of polar nanoregions to the longitudinal properties in [001]-poled Pb(Mg1/3Nb2/3)O-3-0.30PbTiO(3) and [110]-poled Pb(Zn1/3Nb2/3)O-3-0.15PbTiO(3) (PZN-0.15PT) domain-engineered crystals are studied. Taking the [110]-poled tetragonal PZN-0.15PT crystal as an example, phase-field simulations of the domain structures and the longitudinal dielectric/piezoelectric responses are performed. According to the experimental results and phase-field simulations, the contributions of polar nanoregions (PNRs) to the longitudinal properties of relaxor-PT crystals are successfully explained on the mesoscale, where the PNRs behave as "seeds" to facilitate macroscopic polarization rotation and enhance electric-field-induced strain. The results reveal the importance of local structures to the macroscopic properties, where a modest structural variation on the nanoscale greatly impacts the macroscopic properties.
机译：极性纳米区域的存在是基于弛豫的铁电材料的最重要特征。最近，在单畴状态下证实了极性纳米区域对弛豫-PbTiO3（PT）晶体的剪切压电性能的贡献，占室温值的50％-80％。然而，对于机电应用而言，畴工程松弛弛豫PT晶体中出色的纵向压电性是最重要的。在本文中，极性纳米区域对[001]-极化Pb（Mg1 / 3Nb2 / 3）O-3-0.30PbTiO（3）和[110]-极化Pb（Zn1 / 3Nb2 / 3）的纵向性质的贡献研究了O-3-0.15PbTiO（3）（PZN-0.15PT）域工程晶体。以[110]极化四方PZN-0.15PT晶体为例，对畴结构和纵向介电/压电响应进行了相场模拟。根据实验结果和相场模拟，成功地在中尺度上解释了极性纳米区域（PNR）对弛豫PT晶体纵向特性的贡献，其中PNR充当“种子”以促进宏观极化旋转并增强电场引起的应变。结果揭示了局部结构对宏观性质的重要性，其中纳米级的适度结构变化极大地影响了宏观性质。

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  • 来源
    《Advanced Functional Materials》 |2017年第18期|1700310.1-1700310.9|共9页
  • 作者

    Li Fei; Zhang Shujun; Xu Zhuo; Chen Long-Qing;

  • 作者单位

    Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA|Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab, Minist Educ, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China;

    Univ Wollongong, Inst Superconducting & Elect Mat, Australia Inst Innovat Mat, Wollongong, NSW 2500, Australia;

    Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab, Minist Educ, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China;

    Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA;

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