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首页> 外文期刊>Physical review >Structural transformations in (1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)BaTiO_3 single crystals studied by Raman spectroscopy
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Structural transformations in (1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)BaTiO_3 single crystals studied by Raman spectroscopy

机译：拉曼光谱研究（1-x）Na_（0.5）Bi_（0.5）TiO_（3-x）BaTiO_3单晶的结构转变

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摘要

Hard-mode Raman spectroscopy was applied to analyze the temperature-induced transformation processes in perovskite-type (ABO3) single crystals of (1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)BaTiO_3 (NBT-xBT) in a wide temperature range between 100 and 1010 K and a composition range of x = 0-0.074 across the morphotropic phase boundary (MPB). The results show abundant uncoupled ferroic structural distortions even at 1010 K and coexistence of two types of mesoscopic-scale ferroic order at lower temperatures. Octahedral BO_6 tilting is typical of pure NBT, while the incorporation of A-site Ba~(2+) suppresses the tilting and promotes the off centering of BO_6 octahedra. The temperature evolution of the phonon modes clearly reveals the two macroscopically observed critical temperatures T_m and T_d as well as, in the case of x≠ 0, two characteristic temperatures T' and T" preceding the T_m and T_d, respectively, which are attributed to mesoscopic-scale antiferroelectric and ferroelectric coupling processes within the A-site-cation subsystem. At x < x_(MPB) the two sublattices, off-centered A-site cations and off-centered B-site cations, remain incoherent in the entire temperature range. Only when the amount of Ba reaches x_(MPB) the two subsystems couple dynamically, which can explain the enhancement of properties at the MPB. The overall ferroic distortion, however, has a minimum at the MPB, probably because at x_(MPB) the ferroelectric coupling between B-site Ti~(4+) cations is reduced to a greater extent than the enhancement of ferroelectric coupling between A-site Bi~(3+) cations.
机译：应用硬模拉曼光谱分析了（1-x）Na_（0.5）Bi_（0.5）TiO_（3-x）BaTiO_3（NBT-xBT）的钙钛矿型（ABO3）单晶的温度诱导转变过程在100到1010 K之间的宽温度范围内，且整个变质相界（MPB）的x = 0-0.074组成范围。结果表明，即使在1010 K时，也存在大量未耦合的铁素体结构畸变，并且在较低温度下两种介观尺度的铁素体有序共存。八面体BO_6倾斜是纯NBT的典型特征，而掺入A-位Ba〜（2+）可抑制倾斜并促进BO_6八面体的偏心。声子模的温度演变清楚地揭示了两个宏观观察到的临界温度T_m和T_d，以及在x≠0的情况下，分别在T_m和T_d之前的两个特征温度T'和T“。 A位置阳离子子系统内的介观尺度的反铁电和铁电耦合过程，在x

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  • 来源
    《Physical review》 |2017年第21期|214102.1-214102.12|共12页
  • 作者

    G. de la Flor; T. Malcherek; S. Gorfman; B. Mihailova;

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    Department of Earth Science, University of Hamburg, Hamburg 20146, Germany,Departamento de Fisica de la Materia Condensada, Universidad del Pais Vasco UPV/EHU, Bilbao, Spain;

    Department of Earth Science, University of Hamburg, Hamburg 20146, Germany;

    Department of Materials Science and Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel;

    Department of Earth Science, University of Hamburg, Hamburg 20146, Germany;

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