Abstract
The crystal structures of Ba 2 LnSbO 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 2 LnSbO 6 with Ln =La, Pr and Nd are neither monoclinic nor cubic as were previously reported. They are rhombohedral with the space group R 3 ¯ . The distortion from cubic symmetry is due to the rotation of the LnO 6/SbO 6 octahedra about the primitive cubic [111] p-axis. On the other hand, the structure of Ba 2SmSbO 6 is found to be cubic. All compounds contain an ordered arrangement of LnO 6 and SbO 6 octahedra.
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