The crystal and magnetic structures of the Ruddlesden-Popper related title compounds are characterized by powder neutron diffraction. The materials crystallize in the space group I4/mmm and consist of double layers of Fe(Co)O5 square pyramids separated by SrX (X: Cl, Br) rocksalt layers. All three phases adopt antiferromagnetic spin structures and possess low temperature moments, indicating the presence of high spin Fe(III) in all compounds. -(KNEE*, C. S.; FIELD, M. A. L.; WELLER, M. T.; Solid State Sci. 6 (2004) 5, 443-450; Sch. Chem., Univ. Southampton, Southampton SO17 1BJ, UK; Eng.) -W. Pewestorf 29-013
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