X-ray and neutron powder diffraction study of the double perovskites Ba{sub 2}LnSbO{sub 6} (Ln=La, Pr, Nd and Sm)

Journal Article · Fri Jul 15 04:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.05.021· OSTI ID:20729038

Fu, W T ^[1]; IJdo, D J.W. ^[1]

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1. Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden (Netherlands)

The crystal structures of Ba{sub 2}LnSbO{sub 6} (Ln=La, Pr, Nd and Sm) at room temperature have been investigated by profile analysis of the Rietveld method using either combined X-ray and neutron powder diffraction data or X-ray powder diffraction data. It has been shown that the structure of Ba{sub 2}LnSbO{sub 6} with Ln =La, Pr and Nd are neither monoclinic nor cubic as were previously reported. They are rhombohedral with the space group R3-bar . The distortion from cubic symmetry is due to the rotation of the LnO{sub 6}/SbO{sub 6} octahedra about the primitive cubic [111]{sub p}-axis. On the other hand, the structure of Ba{sub 2}SmSbO{sub 6} is found to be cubic. All compounds contain an ordered arrangement of LnO{sub 6} and SbO{sub 6} octahedra.

• OSTI ID: 20729038
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 7 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANTIMONY COMPOUNDS
BARIUM COMPOUNDS
NEUTRON DIFFRACTION
OXIDES
PEROVSKITES
RARE EARTH COMPOUNDS
ROTATION
SPACE GROUPS
SYMMETRY
TEMPERATURE RANGE 0273-0400 K
TRIGONAL LATTICES
X-RAY DIFFRACTION