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Influence of oxygen octahedral tilting on the properties of low-dimensional lead-zirconium-titanate systems.

机译：氧八面体倾斜对低维钛酸锆锆体系性能的影响。

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摘要

In this thesis, we investigate low-dimensional Pb(Zr,Ti)O3 (PZT) systems in the presence of antiferrodistortive (AFD) oxygen octahedral tilting. In Chapter 1, some basic concepts and definitions useful for the following discussion are brought in. Chapter 2 addresses a question of AFD influence on epitaxial strain induced phase transitions in PZT ultrathin films under the short-circuit (SC) electrical boundary conditions, as a function of applied strain and alloy composition. Chapter 3 considers the same two-dimensional system under the open-circuit (OC) electrical boundary conditions leading to a formation of stripe domains. More precisely, properties of multi-domain system under the influence of AFD degrees of freedom using the Monte Carlo techniques are studied in Chapter 3. Chapter 4 deals with novel phenomena which appear in the zero-dimensional stress-free cubic nanodot made of PZT disordered solid solution under the OC electrical boundary conditions in the ground state. The consequences of coupling between the electric dipoles organized in vortices and AFD oxygen octahedral tilting is investigated and new order parameter to describe the new state of the system is introduced. In Chapter 5, the same zero-dimensional system under the SC conditions is examined which reveals the Curie temperature dependence on Ti content in the PZT alloy and the size of a nanodot enhanced by the influence of AFD displacements. Chapter 6 briefly lists the main achievements of the research discussed in the Thesis.
机译：在本文中，我们研究了反铁畸变（AFD）氧八面体倾斜存在下的低维Pb（Zr，Ti）O3（PZT）系统。在第1章中，引入了一些对下面的讨论有用的基本概念和定义。第2章解决了AFD对短路（SC）电边界条件下PZT超薄膜中外延应变诱导的相变的影响的问题。应变和合金成分的函数。第3章考虑了在开路（OC）电边界条件下导致条带域形成的同一二维系统。更准确地说，在第3章中研究了使用Monte Carlo技术在AFD自由度影响下的多域系统的特性。第4章处理了由无序PZT制成的零维无应力立方纳米点中出现的新现象。在OC电边界条件下处于基态的固溶体。研究了涡流中组织的电偶极子与AFD氧气八面体倾斜耦合的结果，并引入了描述系统新状态的新阶参数。在第5章中，研究了在SC条件下相同的零维系统，该系统揭示了居里温度对PZT合金中Ti含量的依赖性以及受AFD位移影响而增强的纳米点的尺寸。第六章简要列出了论文中研究的主要成果。

著录项

  • 作者

    Sichuga, David Leybovich.;

  • 作者单位

    University of Arkansas.;

  • 授予单位 University of Arkansas.;
  • 学科 Physics Condensed Matter.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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