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Journal of Structural Chemistry

2008 year, number 4

REFINEMENT OF THE CATION DISTRIBUTION IN Nb-Mo DOUBLE OXIDE

T. Y. Kardash, L. M. Plyasova, V. M. Bondareva, A. N. Shmakov
Keywords: powder X-ray diffraction, Rietveld refinement, X-ray anomalous scattering, Nb2Mo3O14 structure
Pages: 729-735

Abstract

The structure of Nb2Mo3O14 double oxide is refined from powder data using synchrotron radiation and the anomalous scattering effect; space group P21m is found for the material. It is demonstrated that in the tetragonal unit cell with parameters а = 23.173 Å, с = 4.0027 Å Nb5+ and Мо6+ ions are stochastically distributed in МО6 octahedra and МО7 pentagonal bipyramids of the polygonal network structure of the Мо5О14 type.