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


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).

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Description/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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/S1466-6049(00)00032-5
Keywords: nitrides, oxides, neutron scattering, crystal structure perovskite
Subjects:
ePrint ID: 18955
Date :
Date Event
1 October 2000Published
Date Deposited: 19 Jan 2006
Last Modified: 16 Apr 2017 23:07
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/18955

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