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首页> 外文期刊>Advanced Functional Materials >Structural Determination and Imaging of Charge Ordering and Oxygen Vacancies of the Multifunctional Oxides REBaMn_2O_(6-x) (RE = Gd, Tb)
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Structural Determination and Imaging of Charge Ordering and Oxygen Vacancies of the Multifunctional Oxides REBaMn_2O_(6-x) (RE = Gd, Tb)

机译：多功能氧化物REBaMn_2O_（6-x）（RE = Gd，Tb）的电荷有序和氧空位的结构确定和成像

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摘要

Charge ordering and oxygen vacancy ordering are revealed in REBaMn_2O_6_δ (RE = Gd, Tb) oxides with perovskite-related structures. Electron diffraction and transmission electron microscopy results indicate a modulation of the crystal structure. The average oxidation state of Mn and the oxygen stoichi-ometry are determined by means of electron energy-loss spectroscopy, giving a REBaMn_2O_(5.75) general formula. A 1:3 Mn~(4+):Mn~(3+) charge ordering model is confirmed by neutron powder diffraction, and oxygen vacancies-Mn~(3+) association is suggested by pair distribution function analysis. Direct imaging of the oxygen sublattice is obtained by phase image reconstruction. Location of the oxygen vacancies in the anion sublattice is achieved by analysis of the intensity of the averaged phase image. Both ionic conduction and multiferroic behavior are predicted from the crystal structures of these oxides.
机译：在具有钙钛矿相关结构的REBaMn_2O_6_δ（RE = Gd，Tb）氧化物中揭示了电荷有序和氧空位有序。电子衍射和透射电子显微镜结果表明晶体结构的调节。 Mn的平均氧化态和氧的化学计量是通过电子能量损失谱确定的，给出了REBaMn_2O_（5.75）的通式。通过中子粉末衍射确定了1：3 Mn〜（4 +）：Mn〜（3+）的电荷有序模型，并通过对分布函数分析提出了氧空位-Mn〜（3+）的缔合。氧亚晶格的直接成像是通过相位图像重建获得的。阴离子亚晶格中氧空位的位置是通过分析平均相位图像的强度来实现的。从这些氧化物的晶体结构可以预测离子导电性和多铁性行为。

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  • 来源
    《Advanced Functional Materials》 |2014年第17期|2510-2517|共8页
  • 作者

    David Avila-Brande; Graham King; Esteban Urones-Garrote; Subakti; Anna Llobet; Susana Garcia-Martin;

  • 作者单位

    Departamento de Quimica Inorganica Universidad Complutense de Madrid Madrid, 28040, Spain;

    Lujan Neutron Scattering Center Los Alamos National Laboratory Los Alamos, NM, 87545, USA;

    Centra,Nacional de Microscopia Electronica Universidad, Complutense de Madrid Madrid, 28040, Spain;

    Departamento de Quimica Inorganica Universidad Complutense de Madrid Madrid, 28040, Spain;

    Lujan Neutron Scattering Center Los Alamos National Laboratory Los Alamos, NM, 87545, USA;

    Departamento de Quimica Inorganica Universidad Complutense de Madrid Madrid, 28040, Spain;

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