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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/109589

    Title: X-ray multi-beam resonant diffraction analysis of crystal symmetry for layered perovskite YBaCuFeO5
    Authors: Wen-Chung Liu;Yu-Zhan Zheng;Yu-Chieh Chih;Yen-Chung Lai;Yi-Wei Tsai;Yan-Zong Zheng;Chao-Hung Du;Fang-Cheng Chou;Yun-Liang Soo;Shih-Lin Chang
    Keywords: X-ray multiple diffraction;diffraction anomalous fine structure;DAFS;dynamical X-ray diffraction theory;crystal symmetry;YBaCuFeO5
    Date: 2016-09-30
    Issue Date: 2017-02-24 02:11:59 (UTC+8)
    Publisher: Wiley-Blackwell Publishing Ltd.
    Abstract: The open question of crystal symmetry for YBaCuFeO5, still under debate, is resolved by using diffraction anomalous fine structure and resonant multi-beam X-ray diffraction at the Fe and Cu K edges. The different asymmetric intensity distributions observed at 7, 7.1305 and 8.9945 keV give direct evidence that the space group of YBaCuFeO5 should be P4/mmm with the distance between Cu and apical O atoms longer than that between Fe and O atoms. This approach provides a direct way to resolve detailed structural symmetry which is indeterminate in conventional Bragg diffraction.
    Relation: Journal of Applied Crystallography 49, p.1721-1725
    DOI: 10.1107/S1600576716013248
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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