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Ferroelectric type materials for actuator applications.

机译：用于执行器的铁电材料。

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摘要

The works reported in this thesis address three basic problem areas which are associated with different practical uses of ferroelectric type materials for electromechanical actuator applications.; In a low strain precision system such as the Lead Magnesium Niobate: Lead Titanate (PMN:PT) family of electrostrictors, precise reproducibility of the electrostrictive strain and the absence of dielectric hysteresis are essential attractions for the use of these materials. Ageing, which is the slow stabilization of an existing ferroic internal structure, is a phenomenon which effects all normal ferroelectric ceramics, and destroys the reproducibility of electrically induced strain in these systems. In this study, it has been shown that by careful fabrication using high purity oxides, 0.9PMN0.1PT ceramic can be made which shows no ageing. Furthermore, by deliberate doping with Manganese oxide (MnO), ageing can be reintroduced. Through a sequence of studies on isothermal ageing and on ageing under bias fields, the nature of the effective internal bias field associated with ordering the defects induced by doping has been explored and the nature of the ageing process delineated.; For very high strain actuators, it is necessary to make use of the spontaneous strains induced by ferroic phase changes, or by domain switching in a spontaneous polarized state. For these systems, the strain versus field relations are hysteretic but in certain cases the strain is a unique function of polarization, so that charge control of dimensions is now possible. Systems explored in this work included paraelectric: ferroelectric switching above the Curie temperature in single crystal BaTiO{dollar}sb3{dollar} (0.36% strain), 90{dollar}spcirc{dollar} domain switching in single crystal BaTiO{dollar}sb3{dollar} (0.65% strain), antiferroelectric: ferroelectric switching in modified Lead Zirconate Titanate Stannate ceramics (0.85% strain) and ferroelectric switching of morphotropic phase boundary compositions in the PLZT ceramic family (0.54% maximum longitudinal strain). Charge control, coercivity and stability of the remanent strain have been explored and the fatigue effects associated with repeated switching examined.; The kinetics of field induced polarization and strain have been investigated for Pb(Ti,Zr)O{dollar}sb3{dollar} family of ferroelectrics, and for the phase switching in the modified Lead Zirconate Titanate Stannate antiferroelectric ceramics. For both families, switching can be accomplished in microsecond switching times under high fields and kinetics of switching does not limit potential applications.
机译：本论文报道的工作解决了三个基本问题领域，这些领域与铁电型材料在机电执行器应用中的不同实际应用有关。在低应变精度系统中，例如铌酸铅镁：钛酸铅（PMN：PT）系列电致伸缩管，电致伸缩应变的精确再现性和不存在介电滞后是使用这些材料的基本吸引力。老化是现有铁氧体内部结构的缓慢稳定，是一种现象，会影响所有普通的铁电陶瓷，并破坏这些系统中电感应应变的再现性。在这项研究中，已经表明，通过使用高纯度氧化物精心制造，可以制成0.9PMN0.1PT陶瓷，且没有老化。此外，通过故意掺杂氧化锰（MnO），可以重新引入老化。通过对等温老化和偏置场下老化的一系列研究，探索了有效内部偏置场的性质，该内部偏置场与掺杂引起的缺陷的排序有关，并描述了老化过程的性质。对于非常高的应变致动器，必须利用由铁性相变或通过在自发极化状态下进行畴切换而引起的自发应变。对于这些系统，应变与场的关系是滞后的，但在某些情况下，应变是极化的唯一函数，因此现在可以控制尺寸。在这项工作中探索的系统包括顺电：单晶BaTiO {sdol} sb3 {dollar}（应变为0.36％）中居里温度以上的铁电转换，BaTiO {sdol3sb3 {美元}（应变为0.65％），反铁电：改性的锆酸钛酸铅锡酸盐陶瓷中的铁电转换（应变为0.85％）和PLZT陶瓷系列中相变相边界成分的铁电转换（最大纵向应变为0.54％）。已经研究了剩余应变的电荷控制，矫顽力和稳定性，并研究了与反复切换相关的疲劳效应。已经研究了铁电体的Pb（Ti，Zr）O {sb3 {dollar}族的场致极化和应变的动力学，以及改性锆钛酸铅钛酸盐Stannate反铁电陶瓷的相变。对于这两个系列，切换都可以在高电场下的微秒切换时间内完成，并且切换动力学并不限制潜在的应用。

著录项

  • 作者

    Pan, Wuyi.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 257 p.
  • 总页数 257
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:50:51

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