Structure and magnetism in the oxygen-deficient perovskites Ce{sub 1-x}Sr {sub x}CoO{sub 3-{delta}} (x {>=} 0.90)

We have examined the structure and phase behaviour of strontium-doped Ce{sub 1-x}Sr {sub x}CoO{sub 3-{delta}} and found that the perovskite form is stabilised over a relatively narrow solid solution range (x > 0.85). A combination of electron, powder X-ray and neutron diffraction has revealed tet...

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Bibliographic Details
Published in:Materials research bulletin 2005-08, Vol.40 (8)
Main Authors: James, M., Wallwork, K.S., Withers, R.L., Goossens, D.J., Wilson, K.F., Horvat, J., Wang, X.L., Colella, M.
Format: Article
Language:English
Subjects:
COBALT
DOPED MATERIALS
ELECTRON DIFFRACTION
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIZATION
MATERIALS SCIENCE
NEUTRON DIFFRACTION
OXIDES
PEROVSKITE
SOL-GEL PROCESS
SOLID SOLUTIONS
STRONTIUM
TETRAGONAL LATTICES
X-RAY DIFFRACTION
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Summary:We have examined the structure and phase behaviour of strontium-doped Ce{sub 1-x}Sr {sub x}CoO{sub 3-{delta}} and found that the perovskite form is stabilised over a relatively narrow solid solution range (x > 0.85). A combination of electron, powder X-ray and neutron diffraction has revealed tetragonal superstructures of the basic perovskite unit; (I4/mmm) 2a {sub p} x 2a {sub p} x 4a {sub p} (x = 0.90) and (P4/mmm) a {sub p} x a {sub p} x 2a {sub p} (x = 0.95). Magnetisation measurements show ferromagnetic behaviour under applied magnetic fields. Low temperature neutron diffraction of Ce{sub 0.10}Sr{sub 0.90}CoO{sub 2.80} in zero field reveals a magnetic cell of dimension 2a {sub p} x 2a {sub p} x 4a {sub p} with an ordered cobalt moment of 1.7 B.M. at 25 K.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2005.03.025