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The discovery of superconductivity in perovskite-related oxide fluorides of composition Sr2CuO2F2+x has stimulated interest in the synthesis and characterisation of other inorganic oxide fluorides with related structures. Recently a new low temperature preparation of inorganic oxide fluorides has been reported, which entails heating the precursor oxide with the polymer poly (vinylidene fluoride) to fluorinate oxygen deficient strontium ferrite, SrFeO3−δ. The oxygen-deficient compounds Sr0.5Ba0.5FeO3−δ has been fluorinated to give a compound of composition Sr0.5Ba0.5FeO2F. The magnetic transition temperature for this compound is determined by Mössbauer spectroscopy to be 670(±10) K.