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Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals

机译：机械限制：调节压电晶体性能的有效途径

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摘要

Using <001>-oriented Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 ferroelectric single crystals as a model material, the impact of mechanical confinements on polarization hysteresis, coercive field, and remanent polarization of relaxor-based piezoc-rystals is investigated. Comparative studies are made among rhombohedral and tetragonal single crystals, as well as a polycrystalline ceramic, under uniaxial and radial compressive pre-stresses. The dramatic changes observed are interpreted in terms of the piezoelectric effect and possible phase transitions for rhombohedral crystals, and ferroelastic domain switching and the piezoelectric effect for tetragonal crystals. Under radial compressive stresses, the coercive field for the rhombohedral crystal is observed to increase to 0.67 kV/mm and that for the tetragonal crystal is increased to 0.78 kV/mm. This is a 200% increase relative to the unstressed condition. The results demonstrate a general and effective approach to overcome the drawback of low coercive fields in these relaxor-based ferroelectric crystals, which could help facilitate widespread implementation of these piezocrystals in engineering devices.
机译：使用<001>取向的Pb（Mg_（1/3）Nb_（2/3））O_3-PbTiO_3铁电单晶作为模型材料，机械限制对弛豫器的极化磁滞，矫顽场和剩余极化的影响-研究了基于压电的晶体。在单轴和径向压缩预应力下，对菱形和四角形单晶以及多晶陶瓷进行了比较研究。观察到的戏剧性变化可以用菱形六面体晶体的压电效应和可能的相变，以及四方晶体的铁弹性域转换和压电效应来解释。在径向压缩应力下，观察到菱面体晶体的矫顽场增加到0.67 kV / mm，而四方晶体的矫顽场增加到0.78 kV / mm。相对于无压力条件，这增加了200％。结果证明了一种通用有效的方法来克服这些基于弛豫的铁电晶体中矫顽场低的缺点，这可能有助于促进这些压电晶体在工程设备中的广泛实施。

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  • 来源
    《Advanced Functional Materials》 |2012年第4期|p.797-802|共6页
  • 作者

    Mie Marsilius; josh Frederick; Wei Hu; Xiaoli Tan; Torsten Cranzow; Pengdi Han;

  • 作者单位

    Department of Materials Science Technische Universitat Darmstadt 64287 Darmstadt, Germany;

    Department of Materials Science and Engineering Iowa State University Ames, IA 50011, USA;

    Department of Materials Science and Engineering Iowa State University Ames, IA 50011, USA;

    Department of Materials Science and Engineering Iowa State University Ames, IA 50011, USA;

    Department of Materials Science Technische Universitat Darmstadt 64287 Darmstadt, Germany;

    H.C. Materials Corporation Bolingbrook, IL 60440, USA;

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