Premium
X‐ray multi‐beam resonant diffraction analysis of crystal symmetry for layered perovskite YBaCuFeO 5
Author(s) -
Liu Wen-Chung,
Zheng Yu-Zhan,
Chih Yu-Chieh,
Lai Yen-Chung,
Tsai Yi-Wei,
Zheng Yan-Zong,
Du Chao-Hung,
Chou Fang-Cheng,
Soo Yun-Liang,
Chang Shih-Lin
Publication year - 2016
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576716013248
Subject(s) - diffraction , crystallography , symmetry (geometry) , x ray crystallography , beam (structure) , perovskite (structure) , crystal (programming language) , crystal structure , bragg's law , space (punctuation) , intensity (physics) , materials science , optics , physics , condensed matter physics , chemistry , geometry , mathematics , programming language , linguistics , philosophy , computer science
The open question of crystal symmetry for YBaCuFeO 5 , 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 YBaCuFeO 5 should be P 4/ 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.