Fj. Berry et al., THE STRUCTURAL CHARACTERIZATION OF TIN-DOPED AND TITANIUM-DOPED ALPHA-FE2O3 PREPARED BY HYDROTHERMAL SYNTHESIS, Journal of solid state chemistry, 130(2), 1997, pp. 272-276
The structural characteristics of tin- and titanium-doped alpha-Fe2O3
prepared by hydrothermal methods have been investigated by Rietveld st
ructure refinement of the X-ray powder diffraction data. The analysis
reveals that the dopant ions adopt two distinct sites: in addition to
partially substituting at the octahedral Fe sites, they also occupy th
e interstitial octahedral sites which are vacant in the alpha-F2O3 str
ucture. The structural model deduced involves clusters of three substi
tuted cations and is rational in that it represents microstructural re
gions of the rutile structure within a matrix of alpha-Fe2O3. (C) 1997
Academic Press.