Mössbauer Study of the Thermal Decomposition Products of SrFeO4

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The thermal decomposition products of SrFeO4 were studied by 57Fe-Mössbauer-effect and X-ray-diffraction measurements. Below 300°C in air, an amorphous Fe3+ product was formed. The Fe4+ or Fe5+ state was not observed in the process. A single-phase product with a perovskite structure was obtained in air at temperatures above 400°C. The products obtained between 400 and 650°C showed cubic symmetry, but above 700°C they showed tetragonal distortion. Two kinds of Fe3+-ion sites were detected in the tetragonal SrFeOx. compounds. All the products obtained under the oxygen pressures from 50 to 500 atm and at temperatures from 300 to 900°C showed cubic symmetry. The Fe3+/Fe4+ ratio in those products was determined from the relative intensities of the Mössbauer absorptions.
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