Abstract：Lanthanum doped γ-Al₂O₃powders were prepared by solution combustion methodusingAl(NO₃)3.9H₂OandLa(NO3)3.6H₂Oasoxygenant and C₂H₅NO₂ as reductant.The products were characterized by analysis means of XRD,XPS and TEM.The effects of calcinations time,calcinations temperature and the amount of substance ratio on products were inspected.The results show that the composite products of lanthanum doped γ-Al₂O₃can be prepared by solution combustion method in one step.Calcination time,calcination temperature and the amount of substance ratio of reactants affect the products in a certain degree.La³⁺is effective on the thermal stability of the γ-Al₂O₃ composite powders.The temperature can reach 950 ℃.There is no La₂O₃ in the products.La³⁺ can exist in the space of γ-Al₂O₃crystal,which cannot replace the place of Al³⁺.

Keywords：solution combustion method;modification;thermal stability

中图分类号：TB35 文献标志码：A