Effect of preferred orientation on catalytic properties of Ce-Fe-O film

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CeO_2 has been applied as an promoter catalyst material due to its excellent oxygen storage capacity, which may be improved by a feather-like microstructure and(100)orientation. The oxygen storage capacity may be improved by a solid solution with the smaller transition metallic ions, e. g., Fe^<3+> : 0. 078 nm. In this study, Ce_<1-x> Fe_xO_<2-δ> solid solution films were prepared by laser chemical vapor deposition and the effects of laser power(P_L)and total pressure(P_<tot>)on the preferred orientation, microstructure and deposition rate were investigated. Non-oriented Ce_<1-x> Fe_xO_<2-δ> single phase films were prepared at P_<tot>=0. 8kPa and P_L=0-δ0W while(100)oriented films were prepared at P_L=δ0-1δ0W. The solubility of Fe_2O_3 in Ce_<1-x> Fe_xO_<2-δ> film was less than 0. 1δ. The highest deposition rate was 100μm/h. The(100)-oriented Ce_<1-x> Fe_xO_<2-δ> solid solution film had a feather-like microstructure, showing a high specific surface area.