（School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000)

Abstract:Ce^{3 +} doped TiO₂-ZnO nanopowders were prepared by the sol -gel method. The effect of Ce^{3 +} doping on phase transformation, crystal structure and crystal size of TiO₂-ZnO gels, was investigated by TG-DTA and XRD. The results showed that anatase, rutile, ZnTiO₃, Zn2Ti3O8 and ZnO can exist in the sintered products by varying Ce^{3 +} content and sintering temperature. Ce³⁺ doping depresses the transformation of gels to anatase, the transformation of anatase to rutile and the formation of ZnTiO₃, as well as the growth of anatase and ZnTiO3 crystal. It may be attributed to the diffusion of Ce³⁺in the rearrangement of the crystals.

Keywords:TiO₂-ZnO, sol-gel, phase transformation, Ce³⁺ doping