氧化铝-氧化硅系纳米粉体的制备及稀土掺杂改性研究  

Study on the preparation and rare-earth modification of Al_2O_3-SiO_2 nanometer powder

作　　者：季惠明[1] 葛志平[1] 胡松屹[1] 徐明霞[1] 刘建良[2] 徐茂[2] 

机构地区：[1]天津大学材料学院,天津300072 [2]昆明贵金属研究所,云南昆明650221

出　　处：《功能材料》2004年第6期788-789,792,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50072014)

摘　　要：　采用液相化学包覆沉淀法制备了Al2O3 SiO2及稀土元素Ce/Pr掺杂的Al2O3 SiO2系复合氧化物纳米粉体,通过XRD、TEM和BET分析手段对粉体的相组成、结构和形态进行了研究,并对8～15μm的红外波段下的发射率进行了测试。实验发现,在800℃的煅烧温度下可以获得Al2O3 SiO2系缺位反尖晶石型结构,尺度约为100nm的椭球形且红外发射率较高的纳米粉体。掺杂稀土Ce、Pr对此纳米粉体的形貌与红外特性均有影响,掺杂2%mol稀土Pr的Al2O3 SiO2系统红外发射率达92%。Nanometer powders of Al2O3-SiO2 and rare-earth Ce/Pr doped Al2O3-SiO2 systems were prepared by coating precipitation method. The phase compositions, structures, and morphologies of the powders were investigated by XRD, TEM and BET. The results indicate that the anti-spinel phase and vacancy structure Al2O3-SiO2 powder calcined at 800°C for 1 h shows a high infrared emission property and ellipse particles with 100 nm in size. The rare-earth Ce and Pr additives have important influence on morphology and infrared characteristics of Al2O3-SiO2 powder. The powder with 2 mol% Pr reaches 92% infrared emissivity.

关 键 词：Al2O3-SiO2系 纳米粉体 稀土掺杂 红外发射特性 

分 类 号：O611.4[理学—无机化学]