Synthesis and characterisation of tin-doped iron oxides

Abstract

Rietveld structure refinement of the X-ray powder diffraction data recorded from tin-doped Fe₃O₄ 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-Fe₂O₃, 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-Fe₂O₃, is stabilised with respect to conversion to α-Fe₂O₃. ⁵⁷Fe Mössbauer spectroscopy shows the Neél temperature for γ-Fe_1.9Sn_0.1O₃ to be between 750 and 820 K. Tin-doped α-Fe₂O₃ 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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