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Abstract
Rietveld structure refinement of the X-ray powder diffraction data recorded from tin-doped Fe 3 O 4 prepared by heating metallic iron, α-iron(III) oxide and tin(IV) oxide in sealed evacuated quartz ampoules shows the tin to substitute on the octahedral sites of the inverse spinel-related structure. Tin-doped γ-Fe 2 O 3 , prepared by boiling a precipitate derived from iron(III), iron(II) and tin(II) under reflux, also adopts an inverse spinel-related structure containing tin on the octahedral sites and, compared to pure γ-Fe 2 O 3 , is stabilised with respect to conversion to α-Fe 2 O 3 . 57 Fe Mossbauer spectroscopy shows the Neel temperature for γ-Fe 1.9 Sn 0.1 O 3 to be between 750 and 820 K. Tin-doped α-Fe 2 O 3 prepared by hydrothermal methods is shown by Rietveld structure refinement of the X-ray powder diffraction data to contain tin in both the substitutional and interstitial octahedral sites of the corundum-related structure.
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