化学沉淀法制备了SiO2和CeO2以及复合氧化物CeO2-SiO2等纳米粉体.对粉体的形貌及物相结构、粒径大小通过TEM及XRD进行了检测分析.SiO2粉体为无定形结构,粒径约500 nm,立方萤石型结构的CeO2及复合氧化物CeO2-SiO2的平均粒径小于10 nm,说明复合氧化物的合成过程抑制了粒径的长大.制备了SiO2/CeO2质量比分别为5％、10％、15％、20％的复合氧化物,煅烧温度为400℃～1000℃,结果显示随着SiO2比例的增加,CeO2的特征峰在逐渐减弱,半高宽变宽,粒径变小；随着煅烧温度的升高,特征峰强度增加,半高宽变窄,颗粒的晶型发育越来越完善,但样品的粒径变大.
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