Influence of iron addition on the oxygen-deficient Sr{sub 0.85}Bi{sub 0.15}Co{sub 1-x}Fe{sub x}O{sub 3-{delta}} (0.0{<=}x{<=}1.0) perovskites

Journal Article · Fri Aug 15 00:00:00 EDT 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.04.037· OSTI ID:21128407

Eriksson, Annika K ^[1]; Lindberg, Fredrik; Svensson, Gunnar ^[2]; Svedlindh, Peter ^[3]; Henry, Paul F ^[4]; Eriksson, Sten-G ^[1]

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1. Department of Environmental Inorganic Chemistry, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden)
2. Department of Structural Chemistry, Stockholm University, SE-106 91 Stockholm (Sweden)
3. Department of Engineering sciences, Uppsala University, Box 534, SE-751 21 Uppsala (Sweden)
4. Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France)

A series of oxygen-deficient Sr{sub 0.85}Bi{sub 0.15}Co{sub 1-x}Fe{sub x}O{sub 3-{delta}} (0.0{<=}x{<=}1.0) perovskite phases were prepared using solid-state reaction. Results of neutron powder diffraction analyses show that the introduction of Fe onto the B-site severely effects the long range coherence of the oxygen vacancy ordered, I4/mmm supercell, observed for the x=0.0 sample. For x=0.1 a smaller, a=b{approx}a{sub p}, c{approx}2a{sub p}, P4/mmm supercell gives the best agreement to the diffraction data, whilst phases in the range 0.2{<=}x{<=}0.6 adopt disordered cubic perovskite structures. Pseudo-cubic, a=b{approx}a{sub p}, c{approx}a{sub p}, structures are found for x{>=}0.8. Evidence of weak superstructures, reflecting local oxygen ordering, is also obtained from electron diffraction. For all oxygen-annealed phases the average structure reverts to cubic Pm3-bar m. The as-prepared samples show G-type antiferromagnetic order at room temperature. The oxygen annealed x=0.10, 0.25 and 1.0 samples display low-temperature spin-glass transitions. - Graphical abstract: Evolving crystal structures of the as-prepared Sr{sub 0.85}Bi{sub 0.15}Co{sub 1-x}Fe{sub x}O{sub 3-{delta}} perovskites as a function of iron content for the compositional range 0.1{<=}x{<=}1.0.

• OSTI ID: 21128407
• Journal Information: Journal of Solid State Chemistry, Vol. 181, Issue 8; Other Information: DOI: 10.1016/j.jssc.2008.04.037; PII: S0022-4596(08)00221-1; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANNEALING
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
COBALT COMPOUNDS
CUBIC LATTICES
ELECTRON DIFFRACTION
FERRITES
IRON ADDITIONS
NEUTRON DIFFRACTION
PEROVSKITE
SPIN GLASS STATE
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
VACANCIES