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首页> 外文期刊>Physical review >Local-structure evidence for a phase transition in a lead-free single crystal of (Na_(1/2)Bi_(1/2))TiO_3-0.06BaTiO_3 by absorption fine-structure spectroscopy with synchrotron x-ray radiation
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Local-structure evidence for a phase transition in a lead-free single crystal of (Na_(1/2)Bi_(1/2))TiO_3-0.06BaTiO_3 by absorption fine-structure spectroscopy with synchrotron x-ray radiation

机译：同步加速器X射线吸收精细结构光谱研究（Na_（1/2）Bi_（1/2）TiO_3-0.06BaTiO_3的无铅单晶中的相变的局部结构证据

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摘要

(Na_(1/2)Bi_(1/2))TiO_3-xBaTiO_3 (NBT-aBT) single crystal, as one of the most promising candidates to replace lead-based ferroelectrics, is a typical and unique lead-free system with morphotropic phase boundary (MPB) by far. In this paper, the phase transition process of NBT-0.06BT crystal in a wide temperature range of 20 ～ 550 ℃ was analyzed at atomic scale by theoretical fitting to the measured synchrotron radiation x-ray absorption fine structure spectra quantitatively. Detailed analysis revealed a gradually transition of local structure at the point of phase transition from rhombohedral to tetragonal phase in NBT-0.06BT crystal on the bond lengths of Bi-O and Bi-Ti. The continuous evolution of local structure with no obvious barrier to overcome is one of the intrinsic characteristics of MPB at atomic scale and is responsible for the high piezoelectric properties. These results could promote the understanding of the origin of the high piezoelectric performance around the MPB and meanwhile guide new lead-free material designs.
机译：（Na_（1/2）Bi_（1/2））TiO_3-xBaTiO_3（NBT-aBT）单晶作为替代基于铅的铁电材料最有希望的候选者之一，是典型且独特的具有变质性的无铅系统相位边界（MPB）。本文通过理论拟合被测同步辐射X射线吸收精细结构光谱，对NBT-0.06BT晶体在20〜550℃的宽温度范围内的相变过程进行了原子尺度的分析。详细的分析显示，在Bi-O和Bi-Ti的键长上，NBT-0.06BT晶体中从菱面体到四方相的相变点，局部结构逐渐过渡。局部结构的连续演变而没有明显的障碍，是MPB在原子尺度上的固有特征之一，并具有高压电性能。这些结果可以促进对MPB周围高压电性能起源的理解，同时指导新的无铅材料设计。

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  • 来源
    《Physical review》 |2020年第10期|104105.1-104105.6|共6页
  • 作者

    Xiaobing Li; Shengdong Nie; Feifei Wang; Xiangyong Zhao; Haiwu Zhang; Haosu Luo; Guorong Li; Jae-Hyeon Ko; Zhi Guo; Zheng Jiang; Renzhong Tai;

  • 作者单位

    School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology 516 Jungong Road Yangpu Shanghai 200093 China;

    Key Laboratory of Optoelectronic Material and Device Department of Physics Shanghai Normal University Shanghai 200234 China;

    Key Laboratory of Inorganic Functional Material and Device Shanghai Institute of Ceramics Chinese Academy of Sciences 215 Chengbei Road Jiading Shanghai 201800 China;

    Department of Physics Hallym University 1 Hallymdaehakgil Chuncheon Gangwondo 24252 Republic of Korea;

    Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences 239 Zhangheng Road Pudong New District Shanghai 201204 China;

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