Synthesis of Cerium(IV) Oxide Ultrafine Particles by Solid-State Reactions

CeO2 ultrafine particles were prepared by solid‐state reactions at room temperature. These particles were found to have very fine particle sizes (∼3 nm) with a fluorite structure (a= 5.42 Å). BET measurements showed that the surface area of the particles was 96.2 m2/g. The use of two different precursors was found to affect the size of the CeO2 particles. We discuss the effect of calcination at different temperatures on the morphology, size, and BET surface area of CeO2 particles. A salt byproduct coating prevented agglomeration of the CeO2 particles.