The a -Fe2O3-SnO2 and a -Fe2O3-SnO2-Y2O3 materials were synthesized byusing chemical coprecipitation method. Microstructure and grain growth of thesematerials were investigated by X-ray diffraction (XRD) and 57Fe Mdssbauerspectroscopy. The experimental results show that Y2O3-dopping may restrain thegrowth of grains
and the size of the nanocrystalline a -Fe2O3-SnO2Y2O3 dependson the sintering temperature.