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also known as ceric oxide, ceric dioxide, ceria, cerium oxide or cerium dioxide, is an oxide of the rare-earth metal cerium. It is a pale yellow-white powder with the chemical formula CeO2. It is an important commercial product and an intermediate in the purification of the element from the ores. The distinctive property of this material is its reversible conversion to a nonstoichiometric oxide.
The principal industrial application of ceria is for polishing, especially chemical-mechanical planarization (CMP). For this purpose, it has displaced many other oxides that were previously used, such as iron oxide and zirconia. For hobbyists, it is also known as "opticians' rouge".
CeO2 is used to decolorize glass by converting green-tinted ferrous impurities to nearly colorless ferric oxides.
Cerium oxide has found use in infrared filters, as an oxidizing species in catalytic converters and as a replacement for thorium dioxide in incandescent mantles
Due to the significant ionic and electronic conduction of cerium oxide, it is well suited to be used as a mixed conductor, with significant value in fuel cell research and development.
Cerium oxide nanoparticles (nanoceria) have been investigated for their antibacterial and antioxidant activity.