Synthesis, structure, and stability of the high-temperature 6H-type perovskite phase Ba3BaSb2O9
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Date
2007-08
Authors
Ling, CD
Avdeev, M
Aivazian, K
Journal Title
Journal ISSN
Volume Title
Publisher
International Union of Crystallography
Abstract
The structure of Ba3BaSb2O9 is reported for the first time as a high-temperature phase with an ideal hexagonal BaTiO3-type structure (space group P6(3)/mmc) and Rietveld-refined against high temperature synchrotron X-ray powder diffraction data. The structure is remarkable for the extreme size difference between the pairs of face-sharing Sb5+O6 octahedra (with mean Sb - O bonds of 1.99 Å) and the single corner-sharing Ba2+O6 octahedra (with mean Ba - O bonds of 2.46 Å), which is greater than for any other reported 6H perovskite. This is consistent with the very different ionic radii of Sb5+ (0.60 Å) and Ba2+ (1.35 Å), and accounts for the instability of this phase at room temperature. The known symmetry-lowering modes of closely related 6H perovskites such as Ba3SrNb2O9 and Ba3SrTa2O9 are considered, but found not to account for the behaviour of Ba3BaSb2O9 on cooling from high temperatures. © 2007, International Union of Crystallography
Description
Keywords
Temperature range, Synthesis, Stability, Perovskites, X-ray diffraction, Synchrotrons
Citation
Ling, C. D., Avdeev, M., & Aivazian, K. (2007). Synthesis, structure, and stability of the high-temperature 6H-type perovskite phase Ba3BaSb2O9. Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 63(4), 584-588. doi.10.1107/S0108768107019441