控制合成条件以湿化学法制备超细颗粒CEO2和CE0.5zr0.5O2固溶体.X射线粉末衍射证实两者皆为立方相.在氧化、还原气氛50℃到650℃条件下分别对样品进行原位拉曼光谱研究.结果发现除440~470CM-1出现面心立方晶格f2g拉曼活性模式对应的强拉曼谱峰外，220~280（290~320）、400~410和560~600（570~620）、780~840（770~790）及1150~1180（1160~1190）CM-1分别出现弱拉曼谱峰.这些弱拉曼谱峰由不同原因引起的晶体结构改变造成.CEO2和CE0.5zr0.5O2固溶体的各拉曼弱峰变化情况不同.弱拉曼谱峰的存在及变化趋势揭示了CEO2和固溶体的结构特征，同时也反映了CE0.5zr0.5O2固溶体具有比CEO2更高催化性能的结构方面的因素CeO 2 and Ce 0.5 Zr 0.5 O 2 solid solution were prepared by wet chemical preparation method. Their crystal structures are face centered cubic(fluoritetype), verified by powder X ray diffraction. In situ Raman spectra of the catalysts from 50 to 650℃ in oxygen and hydrogen atmosphere show the 440～470 cm -1 strong Raman peaks due to the F 2g Raman active mode of fluorite structure materials. 220～280(290～320), 400～410 and 560～600(570～620), 780～840(770～790) and 1 150～1 180(1 160～1 190) cm -1 weak Raman peaks are also present. These weak Raman peaks originated from the disorder of crystal structures with different reasons. The Raman peaks of CeO 2 and Ce 0.5 Zr 0.5 O 2 solid solution have different changes with the alteration of environmental conditions. Characterization of CeO 2 and Ce 0.5 Zr 0.5 O 2 solid solution can be given from the weak Raman peaks. These peaks also reveal the structural reasons of higher catalytic reactivity and larger oxygen storage capacity of the Ce 0.5 Zr 0.5 O 2 solid solution.福建省自然科学基
