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首页> 外文期刊>Journal of Applied Physics >Competing structural phase transition scenarios in the giant tetragonality ferroelectric BiFeO_3-PbTiO_3: Isostructural vs multiphase transition
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Competing structural phase transition scenarios in the giant tetragonality ferroelectric BiFeO_3-PbTiO_3: Isostructural vs multiphase transition

机译：巨型四方铁电体BiFeO_3-PbTiO_3中竞争的结构相变场景：同构与多相转变

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摘要

A systematic x-ray and neutron powder diffraction study of the giant tetragonality multiferroic (1-x) BiFeO_3-(x) PbTiO_3 have revealed that the compositions close to the morphotropic phase boundary present two different structural phase transition scenarios on cooling from the cubic phase: (ⅰ) cubic→tetragonal (T_2) + tetragonal (T_1)→tetragonal (T_1) and (ⅱ) cubic→tetragonal (T_2) + tetragonal (T_1) + rhombohedral (R3c)→tetragonal (T_1) + rhombohedral (R3c). The comparatively larger tetragonality (c/a- 1) of the T_1 phase as compared to the coexisting isostructural T_2 phase is shown to be a result of significantly greater degree of overlap of the Pb/Bi-6s and Ti/Fe-3d with the O-2p orbitals as compared to that in the T_2 phase. The formation/ suppression of the minor metastable rhombohedral phase seems to be governed by subtle play of local kinetic factors. In the scenario when the minor rhombohedral (R) phase is formed along with the tetragonal phases it is able to accommodate the large transformation stress in the system due to formation of the tetragonal phases, and prevent the solid from disintegration into powder after sintering. When the metastable rhombohedral phase is not formed, the large transformation strain ruptures the grain boundaries leading to fragmentation of the dense solid to powder.
机译：对巨大的四方性多铁性（1-x）BiFeO_3-（x）PbTiO_3进行的系统x射线和中子粉末衍射研究表明，在从立方晶相冷却时，接近向晶相边界的成分呈现两种不同的结构相变情形：（ⅰ）立方→四角形（T_2）+四角形（T_1）→四角形（T_1）和（ⅱ）立方→四角形（T_2）+四角形（T_1）+菱形（R3c）→四角形（T_1）+菱形（R3c） 。与共存的同构T_2相相比，T_1相的四方性（c / a-1）较大，这是Pb / Bi-6s和Ti / Fe-3d与Pb / Bi-6s重叠程度明显更高的结果。与T_2相相比，O-2p的轨道。次亚稳态菱形面相的形成/抑制似乎受局部动力学因素的微妙影响。在较小的菱形（R）相与四方相同时形成的情况下，由于四方相的形成，它能够适应系统中较大的转变应力，并防止固体在烧结后崩解成粉末。当未形成亚稳态的菱面体相时，较大的转变应变会破坏晶界，导致致密的固体破碎成粉末。

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  • 来源
    《Journal of Applied Physics》 |2013年第8期|084102.1-084102.8|共8页
  • 作者

    V. Kothai; Anatoliy Senyshyn; Rajeev Ranjan;

  • 作者单位

    Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;

    Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM Ⅱ). Technische Universitaet Muenchen,Lichtenbergestrasse I, D-85747 Garching b. Muenchen, Germany;

    Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;

  • 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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