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纳米Ce_1-xCo_xO_2-δ固溶体的水热合成及表征

Hydrothermal Synthesis and Characterization of Nanometer Ce_1-xCo_xO_2-δ Solid Solutions

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【Author】 ZHANG Guo-Fang1,3, XUE Yan-Feng2, XU Jiao-Xing1, QIU Xiao-Qing1, LI Guang-She1, LI Li-Ping 1*(1. State Key Structural Chemistry Laboratory, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;2. College of Physics, Jilin University, Changchun 130023, China;3. Graduate School, Chinese Academy of Science, Beijing 100049, China)

【机构】中国科学院福建物质结构研究所结构化学国家重点实验室；中国科学院研究生院；北京100049；吉林大学物理学院；中国科学院福建物质结构研究所；结构化学国家重点实验室；福建350002；长春130023；

【摘要】采用水热方法,在络合剂及氧化剂的辅助下合成出传统方法难以合成的Ce1-xCoxO2-δ固溶体.XRD结果表明,Ce1-xCoxO2-δ固溶体具有立方萤石结构;产物的平均粒度约为4nm.小半径、低价态Co离子的掺杂导致晶格收缩.结合XRD和Raman表征结果确定固溶体的固溶限约为x=0.06.紫外光谱分析结果表明,Co离子以混合价态(+2,+3)存在于CeO2晶格中,随着钴掺杂量的增大,带隙逐渐蓝移.低于固溶限样品的室温体相电导率随着钴含量增大而提高.更多还原

【Abstract】 Using (NH4)2S2O8 and NH4OH as the oxidizer and chelating agent, respectively, Ce1-xCoxO2-δ solid solutions were synthesized under hydrothermal conditions and the optimum preparation parameters were explored. The obtained solid solutions had a cubic fluorite structure, and the average particle size was about 4 nm. The lattice parameter monotonously decreased with increasing the cobalt content. The solubility of x=0.06 was determined by combining XRD and Raman techniques. Cobalt ions are found to be in a mixed valence state of Co2+/ Co3+ in CeO2 lattice. Increasing the cobalt content resulted in a clear blue shift of the absorption threshold edge and an increase of bulk conductivity.更多还原