( 1. 福州大学 材料研究所， 福州 350002；
2. 美国密苏里罗拉大学 材料研究中心, 罗拉 65409 )
摘 要: 用溶胶凝胶法制备了CeO2+SnO2/Ti二元氧化物被覆钛涂层。 经不同温度退火处理后， 通过X射线衍射和透射电子显微(TEM)对钛阳极涂层的显微结构进行了表征。 结果表明： 通过控制制备条件可获得具有纳米结构的钛阳极涂层； 当Sn的摩尔分数为83%时， 涂层主要为金红石相的(Sn, Ce)O2固溶体； 当Sn的摩尔分数为44%时， 涂层中金红石相(Sn, Ce)O2固溶体和萤石结构的(Ce, Sn)O2固溶体共存； 当Sn的摩尔分数为17%时， 涂层由萤石结构的(Ce, Sn)O2固溶体组成； 高于450 ℃退火时， 含83%Sn的涂层中出现CeO2相， 而在含83%Ce的涂层中没有出现SnO2相， 表明在相同的溶质浓度下， 萤石结构的(Ce, Sn)O2固溶体比锡基金红石相(Sn, Ce)O2固溶体具有更好的热稳定性； 而涂层中的SnO2具有明显改善涂层分散性的作用。
关键字: CeO2； 钛阳极； 纳米材料； 骨架
（ 1. Institute for Materials Research, Fuzhou University, Fuzhou 350002, China;
2. Materials Research Center, University of Missouri-Rolla,
Rolla, MO 65409, USA）
Abstract: CeO2+SnO2 binary oxide coated titanium anodes were prepared by the sol-gel method. Annealed at various temperatures, the microstructures of the anodes were investigated by XRD and TEM. The results indicate that nanoscale coatings can be obtained by controlling the preparation condition. When the molar fraction of SnO2 is 83%, the main component of the coating is (Sn, Ce)O2 solid solution with rutile structure. When the molar fraction of SnO2 is 44%, the main components of coating are the (Sn, Ce)O2 solid solution with rutile structure and (Ce, Sn)O2 solid solution with fluorite structure. When the molar fraction of SnO2 is 17%, the main component of the coating is (Ce, Sn)O2 solid solution with fluorite structure. Annealed at higher temperature than 450 ℃, CeO2 is found in the coating containing 83%Sn, and there is not SnO2 in the coating containing 83%Ce, which suggests that fluorite (Ce, Sn)O2 has higher thermal stability than rutile (Sn, Ce)O2. When the molar fraction of SnO2 increases, the dispensability of the coatings is improved greatly.
Key words: CeO2; titanium anode; nanomaterial; carrier
