Tin doping of α-Cr2O3 and α-(FeCr)2O3

Tin-doped oxides of the type α-Cr2O3 and α-(FeCr)2O3 have been prepared. Tin K-edge EXAFS indicates tin to be octahedrally coordinated in all materials. 119Sn and 57Fe Mössbauer spectra recorded from the corundum-related ca. 7% tin-doped α-Cr2O3 and α-Fe1.1Cr0.9O3 phases show the presence of magnetic order from ca. 20 to ca. 220 K in the case of α-Cr2O3 and to 295 K in the case of α-Fe1.1Cr0.9O3. The 119Sn Mössbauer spectra demonstrate weaker superexchange interactions between Sn4+ and Cr3+ as compared to those between Sn4+ and Fe3+.