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OALib Journal期刊
ISSN: 2333-9721
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ca掺杂及ca--sm和ca--gd复合掺杂ceo2基纳米粉体的制备
Keywords: 无机非金属材料,均相沉淀,掺杂氧化铈,纳米级固溶体
Abstract:
？以草酸铵为沉淀剂,以尿素为ph调节剂,以ce(no3)3？?6h2o、ca(no3)2?4h2o、sm2o3和gd2o3为起始原料,采用改进的均相沉淀法合成前驱物,将其在700℃焙烧4.5h,分别制备出ca掺杂及ca--sm和ca--gd复合掺杂的ceo2基纳米粉体.用x射线衍射(xrd)、扫描电子显微镜(sem)和bet法等技术对焙烧粉体的物相、形貌、晶粒尺寸及比表面积进行了分析表征.结果表明,当混合金属离子的总浓度为0.5mol/l、沉淀剂浓度为0.05mol/l、起始水解ph值为1时,可制备出具有立方萤石型晶体结构及良好结晶性、粒度分布在34--39nm之间的球形纳米粉体.采用乙醇分散和洗涤掺杂前驱体沉淀,能有效地减轻焙烧粉体的团聚程度.
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