Abstract
The defect structure of CeO 2− x has been investigated over the composition range from CeO 2 to CeO 1.8 and 900°C using the combined techniques of high temperature dilatometric length change and X-ray lattice parameter measurements. The oxygen partial pressure associated with the nonstoichiometric composition was controlled by passing different ratios of H 2/He mixtures through a constant temperature water bubbler and was monitored constantly with a YSZ oxygen sensor. The difference between the percent expansion for the dilatometric and X-ray lattice parameter measurements was zero, which indicated that the predominant defects of the CeO 2- x are oxygen vacancies.
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