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Sullivan, E.
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article
Crystallographic and magnetic characterisation of the brownmillerite Sr2Co2O5
Abstract
Sr2Co2O5 with the perovskite-related brownmillerite structure has been synthesised via quenching. with the orthorhombic unit cell parameters a=5.4639(3) angstrom, 6=15.6486(8) angstrom and c=5.5667(3) angstrom based on refinement of neutron powder diffraction data collected at 4 K. Electron microscopy revealed L-R-L-R-intralayer ordering of chain orientations, which require a doubling of the unit cell along the c-parameter, consistent with the assignment of the space group Pcmb. However, on the length scale pertinent to NPD, no long-range order is observed and the disordered space group Imma appears more appropriate. The magnetic structure corresponds to G-type order with a moment of 3.00(4) mu(B) directed along [100]. (C) 2011 Elsevier Inc. All rights reserved.