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首页> 外文期刊>Materials Science and Engineering >Hysteresis behaviors of barium titanate single crystals based on the operation of multiple 90° switching systems
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Hysteresis behaviors of barium titanate single crystals based on the operation of multiple 90° switching systems

机译：基于多个90°切换系统的操作的钛酸钡单晶的磁滞行为

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摘要

Large strain actuation in barium titanate (BaTiO_3) single crystals subjected to combined uniaxial stress and electric field is examined. A maximum strain of about 0.45% is measured under a combined loading of 2.7 MPa compressive stress and ±1.25 MV m~(-1) cyclic electric field. Above 2.7 MPa, the crystal does not cycle fully between the in-plane and out-of-plane polarized states due to large compressive stress, and consequently, a considerable reduction in actuation strain is apparent. The hysteresis evolution of the crystal under combined electromechanical loading reveals incomplete switching characteristics and a considerable disproportion of slope gradients at zero electric field for the measured polarization and strain hysteresis curves. A likely cause for the disproportion of slope gradients is the cooperative operation of multiple 90 switching systems by which "polarization-free" strain changes are induced. An in situ domain observation study reveals the formation of bubble-like micro-domains prior to the macroscopic 90 switching of the crystal bulk. The presence of these bubble-like "switching weak points" indicates that regions within the BaTiO_3 single crystal do not necessarily switch 90 at the same time, and hence, in a way, supports the existence of multiple 90 switching systems. Results obtained in the present study are expected to assist the development of reliable constitutive models for single crystal ferroelectrics.
机译：研究了钛酸钡（BaTiO_3）单晶在单轴应力和电场共同作用下的大应变驱动。在2.7 MPa压缩应力和±1.25 MV m〜（-1）循环电场的联合载荷下测得的最大应变约为0.45％。高于2.7 MPa，由于大的压缩应力，晶体无法在面内和面外极化状态之间完全循环，因此，明显降低了驱动应变。在组合的机电负载下，晶体的磁滞演化揭示了不完整的开关特性，并且在零电场下，对于测得的极化和应变磁滞曲线，斜率梯度存在相当大的歧义。斜率梯度不均衡的可能原因是多个90个开关系统的协同操作，由此引发“无极化”应变变化。原位畴观察研究揭示了在晶体块的宏观90转换之前气泡状微畴的形成。这些气泡状“开关弱点”的存在表明BaTiO_3单晶内的区域不一定同时开关90，因此在某种程度上支持多个90开关系统的存在。在本研究中获得的结果有望有助于单晶铁电体可靠本构模型的开发。

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  • 来源
    《Materials Science and Engineering》 |2009年第3期|50-54|共5页
  • 作者

    J. Shieh; J.H. Yeh; Y.C. Shu; J.H. Yen;

  • 作者单位

    Department of Materials Science and Engineering, National Taiwan University. 1 Roosevelt Road, Sec. 4, Taipei 106, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University. 1 Roosevelt Road, Sec. 4, Taipei 106, Taiwan;

    Institute of Applied Mechanics, National Taiwan University, 1 Roosevelt Road, Sec. 4. Taipei 106, Taiwan;

    Institute of Applied Mechanics, National Taiwan University, 1 Roosevelt Road, Sec. 4. Taipei 106, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    BaTiO_3; single crystals; electromechanical loading; domain switching; hysteresis;

    机译：BaTiO_3;单晶;机电负载;域切换;磁滞现象;

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