• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Lone-Pair-Induced Covalency as the Cause of Temperature- and Field-Induced Instabilities in Bismuth Sodium Titanate
【24h】

Lone-Pair-Induced Covalency as the Cause of Temperature- and Field-Induced Instabilities in Bismuth Sodium Titanate

机译：钛酸铋钠中孤对诱导的共价作用是温度和磁场诱导的不稳定性的原因

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Bismuth sodium titanate (BNT)-derived materials have seen a flurry of research interest in recent years because of the existence of extended strain under applied electric fields, surpassing that of lead zirconate titanate (PZT), the most commonly used piezoelectric. The underlying physical and chemical mechanisms responsible for such extraordinary strain levels in BNT are still poorly understood, as is the nature of the successive phase transitions. A comprehensive explanation is proposed here, combining the short-range chemical and structural sensitivity of in situ Raman spectroscopy (under an applied electric field and temperature) with macroscopic electrical measurements. The results presented clarify the causes for the extended strain, as well as the peculiar temperature-dependent properties encountered in this system. The underlying cause is determined to be mediated by the complex-like bonding of the octahedra at the center of the perovskite: a loss of hybridization of the 6s~2 bismuth lone pair interacting with the oxygen p-orbitals occurs, which triggers both the field-induced phase transition and the loss of macroscopic ferroelectric order at the depolarization temperature.
机译：钛酸铋钠（BNT）衍生的材料近年来受到了广泛的研究兴趣，因为在施加电场下存在扩展的应变，超过了最常用的压电锆钛酸铅（PZT）的应变。对于BNT中这种异常应变水平的基本物理和化学机理，以及连续相变的性质，仍然知之甚少。本文提出了一个全面的解释，将原位拉曼光谱法（在施加的电场和温度下）的短程化学和结构敏感性与宏观电学测量相结合。给出的结果阐明了应变扩展的原因，以及在该系统中遇到的特殊的温度依赖性。确定其根本原因是由钙钛矿中心的八面体的复杂样结合所介导的：发生了与氧p轨道相互作用的6s〜2铋孤对的杂交损失，这触发了两个场诱导的相变和去极化温度下宏观铁电序的损失。

著录项

  • 来源
    《Advanced Functional Materials》 |2012年第11期|p.2285-2294|共10页
  • 作者

    Denis Schuetz; Marco Deluca; Werner Krauss; Antonio Feteira; Tim Jackson; Klaus Reichmann;

  • 作者单位

    Christian Doppler Laboratory for Advanced Ferroic Oxides Institute for Chemistry and Technology of Materials Graz University of Technology Stremayrgasse 9/3, A-8010 Graz, Austria;

    Institut fuer Struktur- und Funktionskeramik Montanuniversitaet Leoben Peter Tunner Strasse 5, A-8700 Leoben, Austria,Materials Center Leoben Forschung GmbH Roseggerstratee 12, A-8700 Leoben, Austria;

    Christian Doppler Laboratory for Advanced Ferroic Oxides Institute for Chemistry and Technology of Materials Graz University of Technology Stremayrgasse 9/3, A-8010 Graz, Austria;

    Christian Doppler Laboratory for Advanced Ferroic Oxides School of Chemistry University of Birmingham Edgbaston, B15 2TT, Birmingham, UK;

    School of Electronic, Electrical and Computer Engineering University of Birmingham Edgbaston, B15 2TT, Birmingham, UK;

    Christian Doppler Laboratory for Advanced Ferroic Oxides Institute for Chemistry and Technology of Materials Graz University of Technology Stremayrgasse 9/3, A-8010 Graz, Austria;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号