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Crystal Structure of the Layered Perovskite-Like Srn(Nb,Ti)nO3n+2 Compounds

Published

Author(s)

Igor Levin, Leonid A. Bendersky

Abstract

The effects of combinations of octadedral tilts on the symmetries of layered AnBnX3n+2 structures were considered. Two complimentary approaches were used to deduce the symmetries of tilted layered structures. The space groups associated with different tilt systems were determined for structures with different layer thicknesses (n-values), and for structures with different layer stacking arrangements. For the most symmetrical tilts about the orthorhombic axes of AnBnX3n+2 structure, maximal group/subgroup relations were established. Comparision of these results with experimental; data availabale in the literature suggests that the symmetries of most observed AnBnX3n+2 compounds is fully determined by tilt system adopted by ridig BX6 octahedra. The most common tilt system observed at room temperature is a combination of in-phase tilt about an orthorhombic axis parallel to the pseudofour-fold axis of the octahedra with a tilt about an orthorhombic axis perpendicular to the layers.
Citation
Acta Crystallographica Section B-Structural Science

Keywords

crystal structure, layered structure, octahedra, oxides, perovskite, symmetries

Citation

Levin, I. and Bendersky, L. (2008), Crystal Structure of the Layered Perovskite-Like Sr<sub>n</sub>(Nb,Ti)<sub>n</sub>O<sub>3n+2</sub> Compounds, Acta Crystallographica Section B-Structural Science (Accessed April 18, 2024)
Created October 16, 2008