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首页> 外文期刊>Advanced Functional Materials >A New Phase Boundary in (Bi_(1/2)Na_(1/2))TiO_3-BaTiO_3 Revealed via a Novel Method of Electron Diffraction Analysis
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A New Phase Boundary in (Bi_(1/2)Na_(1/2))TiO_3-BaTiO_3 Revealed via a Novel Method of Electron Diffraction Analysis

机译：通过电子衍射分析的新方法揭示（Bi_（1/2）Na_（1/2））TiO_3-BaTiO_3的新相界

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摘要

A new phase boundary is revealed in (1-x)(Bi_(1/2)Na_(1/2))TiO_3-xBaTiO_3, the most extensively studied lead-free piezoelectric solid solution. This discovery results from a novel method of electron diffraction analysis, which allows the precise determination of oxygen octahedra tilting in multi-domain perovskite ferroelectrics. The study using this method supports the recently proposed Cc symmetry for pure (Bi_(1/2)Na_(1/2))TiO_3, and, more importantly, indicates the crystal structure evolves into the R3c symmetry with the addition of BaTiO_3, forming a Cc/R3c phase boundary at x = 3-4％. In the poling field E_(pol) versus composition x phase diagram for polycrystalline ceramics, this phase boundary exists with E_(pol) below 5.5 kV mm~(-1); the Cc phase is transformed to the R3c phase during poling at higher fields. The results reported here provide the microstructural origin for the previously unexplained strain behavior and clarify the low-BaTiO_3-content phase relationship in this popular lead-free piezoelectric system.
机译：在最广泛研究的无铅压电固溶体（1-x）（Bi_（1/2）Na_（1/2））TiO_3-xBaTiO_3中揭示了新的相界。这一发现来自一种新颖的电子衍射分析方法，该方法可以精确确定多畴钙钛矿铁电体中氧八面体的倾斜度。使用该方法的研究支持了最近提出的纯（Bi_（1/2）Na_（1/2））TiO_3的Cc对称性，更重要的是，表明通过添加BaTiO_3晶体结构演变为R3c对称性，从而形成Cc / R3c相界在x = 3-4％。在多晶陶瓷的极化场E_（pol）-成分x相图中，当E_（pol）低于5.5 kV mm〜（-1）时，存在该相界。在较高场极化时，Cc相转变为R3c相。此处报道的结果为先前无法解释的应变行为提供了微观结构起源，并阐明了这种流行的无铅压电系统中低BaTiO_3含量的相关系。

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  • 来源
    《Advanced Functional Materials》 |2013年第42期|5261-5266|共6页
  • 作者

    ChengMa; HanzhengGuo; XiaoliTan;

  • 作者单位

    Department of Materials Science and Engineering Iowa State University Ames, IA 50011, USA;

    Department of Materials Science and Engineering Iowa State University Ames, IA 50011, USA;

    Department of Materials Science and Engineering Iowa State University Ames, IA 50011, USA;

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