Abstract
A homogeneous CeO2-ZrO2 solid solution has an ordered cation arrangement and exhibits the highest oxygen storage/release capacity (OSC) among several types of CeO2-ZrO2 with the same composition (Ce/Zr = 1). The crystal structure of this CeO2-ZrO2 solid solution is usually termed the “κ-CeZrO4 phase”. Its OSC performance degrades upon high-temperature treatment under an oxidative atmosphere. Using Ce K- and Zr K-edges XAFS and powder XRD, this research investigated the structural change along with the thermal degradation of κ-CeZrO4. The fresh sample was aged at 973 K, 1273 K and 1473 K under an oxidative atmosphere. Their OSC performances were characterized at 773 K by a thermo-gravimetric method. The OSC performance deteriorated in the order: the fresh sample ≈ 973 K > 1273 K > 1473 K-aged samples. We also found that, if the temperature went beyond 1273K, the Ce/Zr ordered arrangement would collapse, and the local structure around Ce and Zr ions would also be changed remarkably. These results indicated that the OSC was strongly dependent on the atomic structure.
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