Cation Ordered Ceria-zirconia Binary Complex Oxides

Abstract

Pyrochlore Ce₂Zr₂O₇ was found in the experiment which changed Ce for Ba in BaZrO₃ in 1955. The pyrochlore structure is a reduced structure in which all Ce ions have triply oxidized state. κCe₂Zr₂O₈ was found in 1995, which is an oxidized structure in which all Ce ions is in the oxidation state +4. These cation ordered structure, pyrochlore and κ phases ceria zirconia complex oxide have extremely high oxygen storage and release rate comparing to CeZrO₂ with cation-random arrangement structure. This review shows the history of discovery and recent application of them.