X-ray Rietveld structure refinement of Sb3O6.5

The crystal structure of Sb3O6.5 has been refined using the Rietveld analysis of X-ray powder diffraction data. The refinement procedure was stopped when the intensity residual R-B = 6.1% had been reached. Sb3O6.5 crystallizes in a cubic structure of the defect pyrochlore type space group Fd-3m (No 227), with the lattice parameter a = 10.3024(5) angstrom, Z = 8, D-c = 5.701(1)g/cm(3). (C) 2009 Elsevier B.V. All rights reserved.