Synthesis and characterisation of tin-doped iron oxides
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 Mössbauer spectroscopy shows the Neél 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.
- This article is part of the themed collection: Solid state chemistry: Novel Syntheses and New Materials: Materials Discussion 1
Please wait while we load your content...
