The extended x-ray absorption fine structure (EXAFS) recorded from tin-doped
α-Fe2O3, prepared by the mechanical milling of tin
dioxide and α-Fe2O3 and by the hydrothermal processing of
iron- and tin-containing precipitates, can be interpreted in terms of a model
in which tin occupies both substitutional octahedral sites and the
interstitial octahedral sites in the corundum-related α-Fe2O3 structure. The EXAFS and 119Sn Mössbauer spectra suggest that
structural models derived from x-ray powder diffraction data do not adequately
describe the complexity of the local environment of tin in α-Fe2O3.
In particular, the EXAFS and 119Sn Mössbauer spectra
recorded from materials made by mechanical milling show evidence of more
disorder. The 119Sn Mössbauer spectra also indicate that the degree of
order in the materials made by both methods is far from perfect and that the
microstructural defects are highly sensitive to tin content and the
preparative method.
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