Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals
Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals
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DOI：
10.1002/adfm.201101301
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发表时间：
2012-02
影响因子：
19
通讯作者：
M. Marsilius;J. Frederick;Wei Hu;X. Tan;T. Granzow;P. Han
中科院分区：
文献类型：
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作者：
M. Marsilius;J. Frederick;Wei Hu;X. Tan;T. Granzow;P. Han
以取向Pb（Mg 1/3 Nb 2/3）O3-PbTiO 3铁电单晶为模型材料，研究了机械约束对弛豫基压电晶体极化滞后、矫顽场和回复极化的影响.在单轴和径向压缩预应力下，对菱形和四面体单晶以及多晶陶瓷进行了比较研究。所观察到的巨大变化解释的压电效应和可能的相变菱形晶体，铁弹域切换和压电效应的四面体晶体。在径向压应力下，观察到的菱面体晶体的矫顽场增加到0.67 kV/mm，并为tetraxide晶体增加到0.78 kV/mm。这是一个200%的增加，相对于无应力的条件。结果表明，一个通用的和有效的方法来克服这些弛豫基铁电晶体中的低矫顽场的缺点，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。
Using ‐oriented Pb(Mg1/3Nb2/3)O3–PbTiO3 ferroelectric single crystals as a model material, the impact of mechanical confinements on polarization hysteresis, coercive field, and remanent polarization of relaxor‐based piezocrystals 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.