= Cerium dioxide
{title2=$\mathrm{CeO_2}$}
= Ceria
{synonym}
<Cerium dioxide> is $\mathrm{CeO_2}$, often called ceria, with a fluorite-related crystal structure. It can accommodate oxygen vacancies together with changes between cerium(IV) and cerium(III).
That coupled defect and redox chemistry supports oxygen storage and release in catalytic materials. A perfectly fixed integer formula is therefore an idealization when discussing oxygen-deficient ceria under changing conditions.
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