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

Record type: Article

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.

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Citation

Weller, M. T. and Skinner, S. J. (2000) Neutron and X-ray powder diffraction studies of the oxynitrides SrW(O,N)(3), Ba3W2(O,N)(8) and Ba3Mo2(O,N)(8) International Journal of Inorganic Materials, 2, (5), pp. 463-467. (doi:10.1016/S1466-6049(00)00032-5).

More information

Published date: 1 October 2000
Keywords: nitrides, oxides, neutron scattering, crystal structure perovskite

Identifiers

Local EPrints ID: 18955
URI: http://eprints.soton.ac.uk/id/eprint/18955
PURE UUID: cbdda3b3-a328-4537-9c2c-bf6ae0a4c5a1

Catalogue record

Date deposited: 19 Jan 2006
Last modified: 17 Jul 2017 16:34

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Contributors

Author: M. T. Weller
Author: S. J. Skinner

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