Abstract
Tin K-edge EXAFS recorded in situ at 498 K from tin-dopedFe3O4 show that the octahedral coordination of tin in the inverse spinel-relatedstructure remains essentially unchanged as it is oxidized to structurally-relatedγ-Fe2O3. Changes in the magnetic hyperfine field distributions in the tin-119 Mössbauer spectra recordedin situ between 285 and 500 K show that at the higher temperatures some of the tin-dopedFe3O4 is converted to structurally-related tin-dopedγ-Fe2O3. Comparison with data recorded from similar materials by57Fe Mössbauer spectroscopy show that the phase transition is sensitive to the partialpressure of oxygen and the period of time at the elevated temperatures. The changesin the magnetic hyperfine field distributions show that conversion of tin-dopedFe3O4 totin-doped γ-Fe2O3 is largely completed at 600 K and occurs without the segregation of tin. At700 K some tin segregates to form tin dioxide as the conversion of tin-dopedFe3O4 totin-doped γ-Fe2O3 is completed. At higher temperatures the inverse spinel-relatedγ-Fe2O3 phase is converted tothe corundum-related α-Fe2O3 structure.
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