The specific features of the structure in a polycrystalline anion-deficient strontium ferrite SrFeO3 – δ have been studied at different oxygen contents by the Mössbauer spectroscopy, X-ray diffraction, and scanning electron microscopy. Three compounds with different compositions have been prepared in the dependence on the condition of heat treatment. Within each of the structures, there are several nonequivalent positions of Fe corresponding to different valence states of Fe and different local oxygen environments, the relation and the degree of distortion of which are changed in the dependence on the oxygen content. Based on the Mössbauer data, the oxygen content in each of the structures is estimated. Yet another ideal Sr16Fe16O45 composition of the SrFeO3 – δ compound is proposed for an intermediate composition in addition to those available in the literature.

The structure features of polycrystalline anion-deficient ferrite strontium SrFeO3-δ have been investigated for different oxygen content by Mossbauer spectroscopy, X-ray diffraction analysis and scanning electron microscopy. Three structures with a different composition have been prepared depending on heat treatment conditions. Several non-equivalent Fe positions exist within each structure that correspond to different local oxygen environments the relation and distortion degree of which change depending on oxygen quantity. Based on the Mossbauer data obtained an oxygen content has been estimated for each structure. One more the model intermediate composition Sr16Fe16O45 of the SrFeO3-δ compound is proposed.