Abstract
The structure of calcium rare earth antimonates with the formula Ca2Ln3Sb3O14 (Ln= lanthanide and Y) has been re-examined by Rietveld refinements using either combined X-ray and neutron diffraction data or X-ray diffraction data alone. Contrary to a previous study reporting the monoclinic structure with the space group I2/m11, we found that the correct space group is R3̅m. In addition, Ca2Ln3Sb3O14 are not weberite-like and belong to the pyrochlore family. The structure resembles that of the recently reported rhombohedral pyrochlores Mn2Ln3Sb3O14 but with disordering of Ca and Ln on both A and one of the B positions. These compounds provide thus new examples of rhombohedral pyrochlore that are derived from the cubic pyrochlores by a 1:3 ordering in both A and B sites.
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