X‐ray multi‐beam resonant diffraction analysis of crystal symmetry for layered perovskite YBaCuFeO5. Issue 5 (23rd September 2016)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Journal of applied crystallography. Volume 49:Issue 5(2016)
• Page Start: 1721
• Page End: 1725
• Publication Date: 2016-09-23
• Subjects: X‐ray multiple diffraction -- diffraction anomalous fine structure -- DAFS -- dynamical X‐ray diffraction theory -- crystal symmetry -- YBaCuFeO5; Crystallography -- Periodicals; 548.05
• DOI: 10.1107/S1600576716013248
• Languages: English
• ISSNs: 0021-8898

Abstract

Abstract : The possibility of using resonant multi‐beam diffraction to resolve the crystal symmetry of YBaCuFeO5 is demonstrated. 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 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.