Ce-Zr-O固溶体的制备和表征

采用硝酸盐直接分解法、共沉淀法、苹果酸溶胶 凝胶法和柠檬酸溶胶 凝胶法制备了Ce Zr O复合氧化物并进行了表征。溶胶 凝胶法制得的Ce Zr O为立方的Ce0 .5Zr0 .5O2 复合氧化物 (其中少量具有立方性质的t″相 ) ,而直接分解和共沉淀法制得的是由立方Ce0 .8Zr0 .2 O2 和四方Ce0 .2 Zr0 .8O2 固溶体组成的复合氧化物。不同制备方法制得的样品由于物相组成不同 ,还原性能也有较大差别。差热分析和X射线衍射分析结果表明 ,凝胶在燃烧的同时生成了Ce0 .5Zr0 .5O2 固溶体。

Characterization and Preparation of Ce-Zr-O Solid Solution

Ce Zr O solid solution was prepared by four different methods(decomposition of nitrate, coprecipitation, hydroxysuccinic acid sol gel and citrate sol gel), and characterized by using X ray powder diffraction(XRD), Raman spectrograph and temperature proprammed reduction(TPR). Cubic Ce 0.5 Zr 0.5 O 2 was obtained by using the sol gel method. The Ce Cr O solid solution was prepared by using decomposition or coprecipitation. The solid solution was composed of cubic Ce 0.8 Zr 0.2 O 2 and tetragonal Ce 0.2 Zr 0.8 O 2. The Ce Zr O solid solution prepared with different methods showed the different reduction preperities owing to different phases. Results of differential thermal analysis(DTA) and XRD show that Ce 0.5 Zr 0.5 O 2 solid solution is produced while the gel is combusting.