采用XRD方法结合粉体相对密度测定研究了热处理条件对沉淀法合成纳米CeO2的结构和性能的影响. 结果表明: 随焙烧温度升高, CeO2晶粒尺寸显著增大, 晶粒发育趋于完整导致晶格畸变度明显降低, 结构致密程度增加使得晶格常数减小, 粉体烧结程度增大, 相应粉体相对密度随之增加; 较低温度(如300.℃)下, 焙烧时间对CeO2晶粒尺寸无明显影响, 相应晶格畸变度、晶格常数和粉体相对密度变化不大; 较高温度(如700.℃)下, CeO2晶粒尺寸随焙烧时间延长而增大, 且焙烧初期粒子增长较快, 此过程伴随着CeO2晶格畸变度进一步下降, 晶格常数却有所增加, 粉体相对密度略有下降; 认为热处理过程CeO2晶粒生长为扩散生长机制是造成不同焙烧温度下焙烧时间对纳米CeO2结构和性能的影响行为不同的主要原因.
参考文献
| [1] | 董相廷,闫景辉,于薇.水热晶化法制备CeO2纳米晶[J].稀有金属材料与工程,2002(04):312-314. |
| [2] | Barbier J;Oliviero L;Renard B et al.Catalytic wet air oxidation of ammonia over M/CeO2 catalysts in the treatment of nitrogen-containing pollutants[J].Catalysis Today,2002,75:29-34. |
| [3] | Palmqvist AEC.;Jaras SG.;Muhammed M.;Johansson EM. .Total oxidation of methane over doped nanophase cerium oxides[J].Catalysis Letters,1998(1):69-75. |
| [4] | Kaspar J;Fornasiero M;Graziani M .Use of CeO2-based oxides in the three-way catalysis[J].Catalysis Today,2000,50:285-298. |
| [5] | Imamura Seiichiro;Yamada Hiroyuki .Combustion activity of Ag/CeO-2 composite catalyst[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2000(2):221-226. |
| [6] | Izu N.;Shin W.;Murayarna N.;Kanzaki S. .Resistive oxygen gas sensors based on CeO2 fine powder prepared using mist pyrolysis[J].Sensors and Actuators, B. Chemical,2002(1):95-98. |
| [7] | Shuk P.;Greenblatt M.;Ramanujachary KV. .NEW METAL-OXIDE-TYPE PH SENSORS[J].Solid state ionics,1996(2):1115-1120. |
| [8] | MORI T;Drennan J;WANG Ya-rong .Influence of nano-structure on electrolytic properties in CeO2 based system[J].Journal of Thermal Analysis and Calorimetry,2002,70:309-319. |
| [9] | Steele BCH. .Appraisal of Ce1-yGdyO2-y/2 electrolytes for IT-SOFC operation at 500 degrees C[J].Solid state ionics,2000(1/4):95-110. |
| [10] | Katsuki M.;Wang SR.;Yasumoto K.;Dokiya M. .The oxygen transport in Gd-doped ceria[J].Solid state ionics,2002(Pt.B):589-595. |
| [11] | MURRAY E P;Tsai T;Barnett S A .A diect methane fuel cell with a ceria based anode[J].Nature,1999,400:649-651. |
| [12] | R. Craciun;S. Park;R. J. Gorte;J. M. Vohs;C. Wang;W. L. Worrell .A novel method for preparing anode cermets for solid oxide fuel cells[J].Journal of the Electrochemical Society,1999(11):4019-4022. |
| [13] | 董相廷,曲晓刚,洪广言,于德才,陆天虹,倪嘉缵.CeO2纳米晶的制备及其在电化学上的应用[J].科学通报,1996(09):847-850. |
| [14] | Steigerwald J M;Murarka S P;Gutmann R J.Chemical Mechnical Planarization of Microelectronic Materials[M].New York, USA: John Wiley & Sons, Inc,1997 |
| [15] | Hoshino T.;Terasaki Y.;Susa K.;Kurata Y. .Mechanism of polishing of SiO2 films by CeO2 particles[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2001(1/3):129-136. |
| [16] | 马燕合.我国稀土应用开发现状及其展望[J].材料导报,2000(01):3-5. |
| [17] | 张立德;牟季美.纳米材料和纳米结构[M].北京:科学出版社,2001:147-148. |
| [18] | 李树堂.晶体X射线衍射学基础[M].北京:冶金工业出版社,1990:55-56.55-56. |
| [19] | 南京化工学院.陶瓷材料研究方法[M].北京:中国建筑工业出版社,1980:200. |
| [20] | 叶瑞伦;方永汉;陆佩文.无机材料物理化学[M].北京:中国建筑工业出版社,1986:300. |
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