采用X射线衍射仪(XRD)、扫描电镜(SEM)和X射线光电子能谱(EDS)研究了大气环境中铈氧化物的组成变化. 实验结果表明, 大气环境中铈的氧化物主要由Ce2O3, Ce7O12和CeO2构成, 氧化初期主要是Ce2O3, 随着氧化时间增加, 大部分Ce2O3逐渐转变为Ce7O12, 而在局部微裂纹集中处直接生成CeO2, 随着氧化过程的进行, Ce7O12逐渐转变为CeO2, 240 h后 Ce7O12几乎完全转变为CeO2;扫描电镜结合能谱分析表明Ce7O12主要以连续致密氧化膜存在, 而CeO2则出现大量微裂纹, 这种变化与两者密度上的差异有关.
参考文献
| [1] | 武汉大学;吉林大学.无机化学[M].北京:高等教育出版社,2004:1068. |
| [2] | 钟淑琳.高等无机化学[M].成都:四川科学技术出版社,1987:107. |
| [3] | Huang D D;Qin F G;Yao Z Y .High quality CeO2 film grown on Si(111) substrate by using low energy dual ion beam deposition technology[J].Applied Physics Letters,1995,61(25):3724. |
| [4] | Zhou QG;Bai XD;Xue XY;Ling YH;Chen XW;Xu J;Wang DR .The oxidation behavior of Ce-implanted ZrN coating[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2004(1/4):236-240. |
| [5] | Dia Sotto Alibo;Yoshiyuki Nozaki .Rare earth elements in seawater: Particle association, shale-normalization, and Ce oxidation[J].Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society,1999(3-4):363-372. |
| [6] | Fu G Y;Niu Y;Wu W T;Gesmundo F .The oxidation of a co-15 wt% Ce alloy under low oxygen pressure at 600～800 ℃[J].Corrosion Science,1998,40(07):1215. |
| [7] | 任清波,张鹏程,褚明福,龚伟平.Ce-5%La合金表面氧化过程研究[J].中国稀土学报,2007(06):730-735. |
| [8] | 张延志,汪小琳,管卫军,陈勇忠,赖新春,王勤国.大气环境中铀表面结构XRD研究[J].原子能科学技术,2003(04):353-357. |
| [9] | Praline G;Koel B E;Hance R L;Lee H I White J M .X-ray photoelectron study of the reaction of oxygen with cerium[J].Journal of Electron Spectroscopy and Related Phenomena,1980,21:17. |
| [10] | Salvi AM.;Varsano F.;Speranza G.;Decker F. .Use of XPS for the study of cerium-vanadium (electrochromic) mixed oxides[J].Surface and Interface Analysis: SIA: An International Journal Devoted to the Development and Application of Techniques for the Analysis of Surfaces, Interfaces and Thin Films,2001(4):255-264. |
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