(Sm2O3)0.04(Gd2O3)0.06掺杂CeO2纳米粉体的制备与表征

稀土, 2006, 27(2): 34-38. doi: 10.3969/j.issn.1004-0277.2006.02.010

(Sm2O3)0.04(Gd2O3)0.06掺杂CeO2纳米粉体的制备与表征

宋希文 ^1, , 赵永旺 ^2, , 王哲峰 ^3, , 赵文广 ^4, , 安胜利 ^5,

1.内蒙古科技大学,内蒙古,包头,014010;北京科技大学,北京,100083

2.内蒙古科技大学,内蒙古,包头,014010

3.内蒙古科技大学,内蒙古,包头,014010

4.内蒙古科技大学,内蒙古,包头,014010

5.内蒙古科技大学,内蒙古,包头,014010;北京科技大学,北京,100083

基金项目: 教育部人才基金内蒙古科技厅资助项目(20010808)

关键词：氧化钐 , 氧化钆 , 氧化铈 , 纳米陶瓷粉体 , Sol-Gel法

Synthesis and Characterization of Nanopowders of CeO2 Doped with Sm2O3 and Gd2O3

以Sm2O3、Gd2O3与Ce2(CO3)3·nH2O为原料,采用改进的沉淀法制备了二元稀土(Sm2O3)0.04 (Gd2O3)0.06掺杂CeO2纳米粉体.测定了pH值对0.80Ce(OH)4·0.08Sm(OH)3·0.12Gd(OH)3水溶胶体系Zeta电位的影响.pH值约为7.0时,体系的Zeta电位为0,即体系的等电点(IEP)为7.0.pH值为10.0时,Zeta电位达到最大值-18.5mV,说明此时该体系的稳定性最好.DTA/TG热分析表明,0.80Ce(OH)4·0.08Sm(OH)3·0.12Gd(OH)3粉体的热分解温度约为232℃.由粉末XRD分析可知,经750℃焙烧的二元稀土掺杂CeO2粉末为立方萤石结构,说明Sm2O3与Gd2O3已完全固溶到CeO2中,形成了CeO2基固溶体.由TEM照片可以看出,粉末具有良好的分散性,呈软团聚状态,粒径在5nm～10nm之间.经BET测试计算的平均颗粒尺寸为11nm,与TEM结果是一致的.

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