Crystallographic and magnetic characterisation of the brownmillerite Sr2Co2O5 |
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Authors: | Eirin Sullivan Joke Hadermann |
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Institution: | a School of Chemistry, University of Birmingham, Birmingham B15 2TT, UK b EMAT, University of Antwerp Groenenborgerlaan 171, B-2020 Antwerp, Belgium |
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Abstract: | Sr2Co2O5 with the perovskite-related brownmillerite structure has been synthesised via quenching, with the orthorhombic unit cell parameters a=5.4639(3) Å, b=15.6486(8) Å and c=5.5667(3) Å 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) μB directed along 1 0 0]. |
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Keywords: | Sr2Co2O5 Brownmillerite Oxygen order Neutron diffraction Magnetic structure Electron diffraction |
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