X-ray diffuse scattering in SrTiO.sub.3./sub. and model of atomic displacements

0377873 - FZÚ 2013 RIV GB eng J - Článek v odborném periodiku
Kopecký, Miloš - Fábry, Jan - Kub, Jiří
X-ray diffuse scattering in SrTiO₃ and model of atomic displacements.
Journal of Applied Crystallography. Roč. 45, č. 3 (2012), s. 393-397. ISSN 0021-8898. E-ISSN 1600-5767
Grant CEP: GA AV ČR IAA100100915
Výzkumný záměr: CEZ:AV0Z10100520
Klíčová slova: diffuse scattering * SrTiO3 * perovskites * synchrotron radiation
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.343, rok: 2012

The scattering intensity of synchrotron radiation in a compact three-dimensional volume of the reciprocal space (sin/theta(max) //lambda$ = 0.6283 A-1) of an SrTiO3 single crystal has been measured at temperatures of 115, 130 and 293 K. The curvilinear features of the diffuse pattern were modelled according to the displacements of both cations correlated along the axis [001]cub (where the subscript cub denotes the cubic structure). The results show that Sr2+ is displaced from the ideal positions along the crystallographic axis [001]cub, forming a short chain composed of about three Sr2+ ions along [001]cub, while the Ti4+ ions are moved in the directions [111]cub, or alternatively [101]cub or [011]cub. The Ti4+ displacements are also correlated along [001]cub, forming a similarly short chain.
Trvalý link: http://hdl.handle.net/11104/0007027