摘要：以Al(NO₃)3.9H₂O、La(NO₃₎3.6H₂O为氧化剂,C₂H₅NO₂为还原剂,采用溶液燃烧法制备镧掺杂γ-Al₂O₃粉体,利用X射线衍射、X射线光电子能谱、透射电镜等分析手段对产物进行表征,考察煅烧温度、煅烧时间、反应物配比对产物的影响。结果表明,采用溶液燃烧法可以一步制备出镧掺杂γ-Al₂O₃复合粉体;煅烧温度、煅烧时间、反应物配比都对产物有一定的影响,La元素的加入可以提高γ-Al₂O₃的相变温度,热稳定性提高到950℃;产物中没有La₂O₃的存在,其中La元素以La³⁺存在于γ-Al₂O₃晶体间隙,并不能取代晶格中Al³⁺的位置。

关键词：溶液燃烧合成法；改性热；稳定性

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