Modelling of cation displacements in SrTiO.sub.3./sub. by means of multi-energy anomalous X-ray diffuse scattering

0463041 - FZÚ 2017 RIV GB eng J - Journal Article
Kopecký, Miloš - Fábry, Jan - Kub, Jiří
Modelling of cation displacements in SrTiO₃ by means of multi-energy anomalous X-ray diffuse scattering.
Journal of Applied Crystallography. Roč. 49, Jun (2016), 1016-1020. ISSN 0021-8898. E-ISSN 1600-5767
R&D Projects: GA ČR GA15-04121S
Institutional support: RVO:68378271
Keywords : X-ray diffuse scattering * atomic displacements * anomalous X-ray scattering * SrTiO₃
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.614, year: 2016

X-ray diffuse scattering of SrTiO3 has been measured at two photon energies, the first just below the absorption edge and the second far from the K absorption edge of strontium, in order to vary the atomic scattering factor of the strontium cations. It is shown that two different models of cation displacement comply with the single-energy diffuse scattering patterns, because single-energy diffuse
scattering provides only ambiguous information on the directions of displacement of the Sr2+ and Ti4+ cations. However, the application of multi-energy anomalous diffuse scattering determines unambiguously that the Sr2+ cations are moved from their ideal positions in the [100] direction and the Ti4+ cations are shifted in {111} directions.
Permanent Link: http://hdl.handle.net/11104/0262334