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以硝酸盐做氧化剂,柠檬酸为燃料,采用低温燃烧法制备纳米级超细Ce0.8Y0.2O1.9 (YDC)固溶体.利用TG-DSC,XRD,SEM,FT-IR和BET等手段对凝胶前驱体的热分解行为、相转化过程和YDC粉体的性能进行表征.TG-DSC结果表明,柠檬酸-硝酸盐干凝胶的点火温度约为263.3℃;经XRD测试,粉体经600℃焙烧即形成了单相立方萤石型结构的固溶体,晶粒度为16 ~23nm.柠檬酸与硝酸盐摩尔比(CA/N)对粉体的微观形貌、比表面积和烧结活性有显著影响.当CA/N为1.5∶1时,粉体粒子间仅有微弱的软团聚,将素坯在1400℃烧结2h,得到相对密度为95.6%,平均粒径约为0.7 μm的陶瓷烧结体.

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