X-ray multi-beam resonant diffraction analysis of crystal symmetry for layered perovskite YBaCuFeO5
Journal
Journal of Applied Crystallography
Journal Volume
49
Pages
1721-1725
Date Issued
2016
Author(s)
Liu, W. C.
Zheng, Y. Z.
Chih, Y. C.
Lai, Y. C.
Tsai, Y. W.
Zheng, Y. Z.
Du, C. H.
Soo, Y. L.
Chang, S. L.
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.The possibility of using resonant multi-beam diffraction to resolve the crystal symmetry of YBaCuFeO5 is demonstrated. © International Union of Crystallography, 2016.
Publisher
International Union of Crystallography
Type
journal article