首页> 外文会议>International Symposium on Eco-Materials Processing amp; Design; 20060108-11; Chengdu(CN) >Quantitative Analysis of Micro-Macro Domain Transition of PNN-PT-PZ(x) System at Higher PZ Content
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Quantitative Analysis of Micro-Macro Domain Transition of PNN-PT-PZ(x) System at Higher PZ Content

机译:PZ含量较高时PNN-PT-PZ(x)系统的微观-宏观区域转变的定量分析

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Since the discovery of relaxor behavior in Pb(Mg_(1/3) Nb_(2/3) )O_3 (referred to as PMN), the studies of relaxor ferroelectrics with Pb(B′_(1/3)B″_(2/3))O_3 type perovskites have intensified because of their excellent dielectric and electromechanical properties. The present study is mainly focused on the quantitative analysis of micro-macro domain transition, using dielectric spectroscopy, hot-stage TEM. The deviation from Curie-Weiss behavior was investigated over a broad range of temperature. As the relative contents of PbZrO_3 increased, the Curie-Weiss temperature decreased, while the Curie-Weiss constant increased. However, the Lorentz polarization factor (γ) decreased with increasing PbZrO_3 content, indicating an enhanced relaxor behavior in the PNN-PT-PZ(x) system at higher PZ content. A microscopic examination demonstrates that the relaxor-normal ferroelectric transition corresponds to a micro-macro domain switching. The long-range ferroelectric domains below the transition temperature were characterized by twin-like 90° macro domains with tetragonal symmetry and by the subdomains, which presumably relieves the internal electrostrictive strains associated with the polarization nonuniformity caused by the polar nanodomains.
机译:自从在Pb(Mg_(1/3)Nb_(2/3))O_3(简称PMN)中发现弛豫行为后,研究了Pb(B′_(1/3)B''_( 2/3))O_3型钙钛矿因其优异的介电和机电性能而得到增强。本研究主要集中在使用介电谱,热台TEM的微观宏观域转换的定量分析。在较宽的温度范围内研究了居里-魏斯行为的偏离。随着PbZrO_3相对含量的增加,居里-魏斯温度降低,而居里-魏斯常数增加。但是,洛伦兹极化因子(γ)随着PbZrO_3含量的增加而降低,表明PNN-PT-PZ(x)系统中PZ含量较高时弛豫行为增强。显微镜检查表明,弛豫-正常铁电跃迁对应于微-宏畴切换。转变温度以下的长距离铁电畴的特征在于具有四边形对称性的双胞胎90°宏观畴和子畴,这大概缓解了与极性纳米畴引起的极化不均匀有关的内部电致伸缩应变。

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