Published August 2006 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Department of Inorganic Materials, Karpov' Institute of Physical Chemistry, Vorontsovo pole, 10 105064 Moscow K-64 (Russian Federation)
  • 2. Environmental Inorganic Chemistry, Chalmers University of Technology, SE-412 96, Gothenburg (Sweden)
  • 3. Department of Materials Chemistry, Angstroem Laboratory, Box 538, University of Uppsala, SE-751 21, Uppsala (Sweden)
  • 4. Department of Engineering Sciences, University of Uppsala, Uppsala (Sweden)
  • 5. NFL Studsvik, University of Uppsala (Sweden)

Description

The magnetic and structural properties of oxygen-deficient perovskites with composition Ba3Fe2WO9-δ (BFWO) have been systematically studied for two different oxygen contents corresponding to δ=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 (δ=0.00) adopts a hexagonal 6H-perovskite structure (space group P63/mmc). This phase, when heated at high temperature under a stream of Ar gas, transforms to an oxygen-deficient phase δ=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 (P63/mmc->Fm-3m) is presented

Additional details

Identifiers

DOI
10.1016/j.jssc.2006.04.050;
PII
S0022-4596(06)00223-4;

Publishing Information

Journal Title
Journal of Solid State Chemistry
Journal Volume
179
Journal Issue
8
Journal Page Range
p. 2645-2655
ISSN
0022-4596
CODEN
JSSCBI

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
38067871
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
BARIUM COMPOUNDS; CRYSTAL-PHASE TRANSFORMATIONS; CUBIC LATTICES; HCP LATTICES; IRON COMPOUNDS; MAGNETIC PROPERTIES; NEUTRON DIFFRACTION; OXIDES; OXYGEN; PEROVSKITE; SPACE GROUPS; STOICHIOMETRY; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TUNGSTEN COMPOUNDS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; ELEMENTS; HEXAGONAL LATTICES; MINERALS; NONMETALS; OXIDE MINERALS; OXYGEN COMPOUNDS; PEROVSKITES; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; SCATTERING; SYMMETRY GROUPS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS

Optional Information

Copyright
Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.