Synthesis and Characterization of SmxGdyCe1-x-yO2-δ Nanopowders
Synthesis and Characterization of SmxGdyCe1-x-yO2-δ Nanopowders
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SmxGdyCe1-x-yO2-δ 纳米粉末的合成与表征
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发表时间：
2005
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采用共沉淀法制备了SmxGdyCe 1-x-yO 2-δ（x+y=0.2和x=0，0.04，0.08，0.12，0.16，0.2）纳米粉体。测定了Ce（OH）4水分散液在不同pH值下的zeta电位和沉降体积。Ce（OH）4悬浮液的等电点（IEP）为7.0。在pH=10时，最大电位值为-18.5mV，最大沉降体积为19 ml。的演化行为和XRD。在300℃以下分解为氧化铈基固溶体，在650℃左右形成立方萤石结构氧化铈。采用XRD、TEM和BET等手段对SmxGdyCe 1-x-yO 2-δ固溶体的性质进行了表征。掺杂CeO 2的晶格常数随Sm ~（3+）取代量的增加（或Gd ~（3+）取代量的减少）而线性增加。掺杂氧化铈粉末的粒径为5 - 10 nm。
SmxGdyCe1-x-yO2-δ (x+y=0.2 and x=0, 0.04, 0.08, 0.12, 0.16, 0.2) nanopowders were prepared by a coprecipitation method. The zeta potential and sedimentation volume of Ce(OH)4 aqueous dispersions at different pH values were measured. The isoelectric point (IEP) of Ce(OH)4 suspensions is 7.0. The maximum potential value of -18.5 mV and maximum sedimentation volume of 19 ml are reached at pH=10. The evolution behaviors of and XRD. The powders decompose to ceria based solid solution at a temperature below 300℃ and forms cubic fluorite structure ceria at about 650℃. The properties of SmxGdyCe1-x-yO2-δ solid solutions were characterized by XRD, TEM and BET. The lattice parameter of doped CeO2 increases linearly with increasing Sm3+ substitution (or decreasing Gd3+ substitution). The particle size of the doped ceria powders is from 5 nm to 10 nm.