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| 纳米Ce1-xCoxO2-δ固溶体的水热合成及表征 | |
| 引用本文： | 张国芳,薛燕峰,许交兴,邱晓清,李广社,李莉萍.纳米Ce1-xCoxO2-δ固溶体的水热合成及表征[J].高等学校化学学报,2007,28(4):603-607. |
| 作者姓名： | 张国芳 薛燕峰 许交兴 邱晓清 李广社 李莉萍 |
| 作者单位： | 1. 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;中国科学院研究生院,北京,100049 2. 吉林大学物理学院,长春,130023 3. 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 |
| 基金项目： | 福建省自然科学基金 , 中国科学院"百人计划" |
| 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4 nm. 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. |
| 关 键 词： | 水热合成 钴掺杂 氧空位 固溶限 |
| 文章编号： | 0251-0790（2007）04-0603-05 |
| 收稿时间： | 2006-09-04 |
| 修稿时间： | 2006-09-04 |
Hydrothermal Synthesis and Characterization of Nanometer Ce1-xCoxO2-δ Solid Solutions |
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| ZHANG Guo-Fang,XUE Yan-Feng,XU Jiao-Xing,QIU Xiao-Qing,LI Guang-She,LI Li-Ping.Hydrothermal Synthesis and Characterization of Nanometer Ce1-xCoxO2-δ Solid Solutions[J].Chemical Research In Chinese Universities,2007,28(4):603-607. | |
| Authors: | ZHANG Guo-Fang XUE Yan-Feng XU Jiao-Xing QIU Xiao-Qing LI Guang-She LI Li-Ping |
| Institution: | 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 |
| 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. |
| Keywords: | Hydrothermal synthesis Cobalt doping Oxygen vacancy Solubility |
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