THE STRUCTURAL CHARACTERIZATION OF TIN- AND TITANIUM-DOPED ALPHA-FE2O3 PREPARED BY HYDROTHERMAL SYNTHESIS

摘要

The structural characteristics of tin- and titanium-doped alpha-Fe2O3 prepared by hydrothermal methods have been investigated by Rietveld structure 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 the interstitial octahedral sites which are vacant in the alpha-F2O3 structure. The structural model deduced involves clusters of three substituted cations and is rational in that it represents microstructural regions of the rutile structure within a matrix of alpha-Fe2O3. (C) 1997 Academic Press. [References: 15]