Neutron and x-ray powder diffraction studies of the oxynitrides SrW(O,N)3, Ba3W2(O,N)8 and Ba3Mo2(O,N)8

Mark T. Weller, Stephen J. Skinner

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Abstract

Oxynitrides of composition SrW(O,N)3, Ba3W2(O,N)8 and Ba3Mo2(O,N)8 have been prepared by the ammonolysis of stoichiometric mixtures of oxides and carbonates. Combined Rietveld refinements of powder neutron and powder X-ray diffraction data have allowed the structure of each to be determined. SrW(O,N)3 was found to have a cubic Perovskite structure whereas Ba3W2(O,N)8 and Ba3Mo2(O,N)8 have a layered hexagonal structure. In the hexagonal structures the oxygen and nitrogen atoms are distributed almost randomly over two sites in the unit cell producing 4-fold co-ordination to tungsten and molybdenum, a distorted octahedral co-ordination to one barium site and a 10-fold co-ordination to the other.
Original languageEnglish
Pages (from-to)463-467
JournalInternational Journal of Inorganic Materials
Volume2
Issue number5
DOIs
Publication statusPublished - 1 Jan 2000

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