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首页> 外文期刊>Applied Physics Letters >Phase transitions and thermotropic phase boundaries in MnO_2-doped (K_(0.5)Na_(0.5))NbO_3-0.05LiNbO_3 single crystals: Raman scattering evidence at elevated temperatures
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Phase transitions and thermotropic phase boundaries in MnO_2-doped (K_(0.5)Na_(0.5))NbO_3-0.05LiNbO_3 single crystals: Raman scattering evidence at elevated temperatures

机译：MnO_2掺杂（K_（0.5）Na_（0.5））NbO_3-0.05LiNbO_3单晶的相变和热致相界：高温下的拉曼散射证据

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摘要

Raman scattering of (K_(0.5)Na_(0.5))NbO_3-0.05LiNbO_3-yMnO_2 (y = 0% and 1.0%) single crystals have been reported in the temperature range from 300 to 800 K. The spectra exhibit a competition between a soft mode and a relaxation mode upon heating across the diverse transitions. The progressive change in the conflicting displacive mechanism (soft mode) and order-disorder (relaxation mode) can explain the origin of the successive orthorhombic-tetragonal-cubic phase transitions. Moreover, the polymorphic phase transition between orthorhombic and tetragonal structures can be confirmed through the observation of thermotropic phase boundaries for MnO_2-doped (K_(0.5)Na_(0.5))NbO_3-0.05LiNbO_3 single crystals.
机译：据报道在300至800 K的温度范围内（K_（0.5）Na_（0.5））NbO_3-0.05LiNbO_3-yMnO_2（y = 0％和1.0％）单晶的拉曼散射。柔和模式和松弛模式在加热时会经历多种转变。冲突的位移机制（软模式）和有序无序（松弛模式）中的逐步变化可以解释连续的正交-四边形-立方相变的起源。此外，通过观察MnO 2掺杂的（K_（0.5）Na_（0.5））NbO_3-0.05LiNbO_3单晶的热致相界，可以证实正交晶和四方晶结构之间的多态相变。

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  • 来源
    《Applied Physics Letters》 |2015年第12期|122901.1-122901.5|共5页
  • 作者

    L. P. Xu; K. Jiang; J. Z. Zhang; G. S. Xu; Z. G. Hu; J. H. Chu;

  • 作者单位

    Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China;

    Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China,National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, China;

    Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China,National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, China;

    Key Laboratory of Transparent Opto-Functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;

    Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China;

    Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 入库时间 2022-08-18 03:15:05

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