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首页> 外文学位 >Microstructure and piezoelectric properties of barium zirconium titanate-barium calcium titanate lead-free material system.
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Microstructure and piezoelectric properties of barium zirconium titanate-barium calcium titanate lead-free material system.

机译：钛酸锆锆钡-钛酸钡钙无铅材料体系的微观结构和压电性能。

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摘要

The recently discovered piezoelectric system based on barium zirconium titanate – barium calcium titanate (BZT-BCT) is a surprising addition to the potential for lead-free materials. The composition lying near the morphotropic phase boundary offers comparable piezoelectric properties to other high performance lead-based systems. In this research, the piezoelectric properties, crystal structure and domain motion were studied on this system to understand its ultra-high piezoelectricity. Based on an in-situ temperature dependent x-ray diffraction study, detailed crystallographic information for tetragonal BZT-BCTs was obtained, and the phase transition temperature was determined. The measured piezoelectric and ferroelectric properties show peak values at the optimum composition of BZT-50BCT. However, by changing the poling condition, a further improvement of piezoelectric properties can be achieved, which is proposed to be due to the development of an internal bias field. In addition, high temperature performance of this system was investigated by studying the thermal depoling behavior of ferroelastic texture. Ferroelastic texture induced by electrical poling is found to be thermally unstable but mechanical grinding was effective in inducing large scale of ferroeleastic domain textures that persist well above Curie temperature. Furthermore, the microstructure origin of high electromechanical behavior of this system was studied by in-situ electrical x-ray diffraction measurement. The contribution from extrinsic domain motion and intrinsic lattice strain to the macroscopic converse piezoelectric effect was resolved and discussed.
机译：最近发现的基于钛酸锆锆​​-钛酸钡钙（BZT-BCT）的压电系统是无铅材料潜力的令人惊讶的补充。位于同相相边界附近的成分可提供与其他高性能铅基系统相当的压电性能。在这项研究中，对该系统的压电特性，晶体结构和畴运动进行了研究，以了解其超高压电性。基于原位温度依赖性X射线衍射研究，获得了四方BZT-BCT的详细晶体学信息，并确定了相变温度。测得的压电和铁电性能在BZT-50BCT的最佳组成下显示出峰值。然而，通过改变极化条件，可以实现压电性能的进一步改善，这是由于内部偏置场的发展所致。此外，通过研究铁弹性织构的热脱模行为，研究了该系统的高温性能。发现由电极化引起的铁弹性织构是热不稳定的，但是机械研磨有效地诱导了在远高于居里温度下持续存在的大规模铁弹性域织构。此外，通过原位电X射线衍射测量研究了该系统的高机电性能的微观结构起源。解决并讨论了外在畴运动和固有晶格应变对宏观逆压电效应的贡献。

著录项

  • 作者

    Li, Binzhi.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Materials Science.
  • 学位 M.S.M.S.E.
  • 年度 2011
  • 页码 78 p.
  • 总页数 78
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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