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Ba3Fe2WO9-delta: Effect of oxygen non-stoichiometry on structural and magnetic properties

SA Ivanov ; Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; R Tellgren ; P Nordblad ; J Eriksen
JOURNAL OF SOLID STATE CHEMISTRY 179 (8): 2645-2655 AUG 2006 8, p. 2645-2655. (2006)
[Artikel, refereegranskad vetenskaplig]

The magnetic and structural properties of oxygen-deficient perovskites with composition Ba3Fe2WO9-6 (BFWO) have been systematically studied for two different oxygen contents corresponding to delta = 0.00 and 0.55 in the chemical formula in order, to determine and correlate their chemical composition, structural and magnetic properties. The evolution of nuclear and magnetic structures with temperature has been investigated by neutron powder diffraction. It was shown that at room temperature the stoichiometric compound (delta = 0.00) adopts a hexagonal 6H-perovskite structure (space group P6(3)/mmc). This phase, when heated at high temperature under a stream of Ar gas, transforms to an oxygen-deficient phase delta = 0.55), which is an ordered cubic perovskite structure (space group Fm-3m). The crystallographic and magnetic properties of the obtained phases are compared, and it is clear that the magnetic properties are significantly affected by oxygen non-stoichiometry. These changes of magnetic properties for such a slight decrease in oxygen content are interpreted as a result of structural transformations. Together with the experimental results based on neutron powder diffraction data a discussion of some aspects of the structural transformation (P6(3)/mmc -> Fm-3m) is presented. (c) 2006 Published by Elsevier Inc.

Nyckelord: ceramics; neutron scattering; crystal structure; magnetic structure

Sten Eriksson Department of Chemical and Biological Engineering, Environmental Inorganic Chemistry stene@chalmers.se

Denna post skapades 2007-01-30. Senast ändrad 2010-01-26.
CPL Pubid: 26119


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)



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