Ce1xZrxO2

Ce1-xZrxO2 is a fluorite-structured solid solution of cerium oxide (CeO2) and zirconium oxide (ZrO2), described by the mole fraction x of ZrO2 in the material. The composition ranges from pure ceria (x = 0) to pure zirconia (x = 1) and is widely studied for its redox properties and oxygen storage capacity in catalytic and energy applications.

The material exhibits a fluorite-type crystal structure. Substituting Ce4+ with Zr4+ introduces lattice distortions and creates oxygen vacancies during redox cycling, which enhances oxygen storage capacity and oxygen ion mobility. Zirconium doping stabilizes the cubic fluorite phase, improves thermal stability, and reduces sintering of ceria-based materials. The lattice parameter typically decreases with increasing Zr content due to the smaller ionic radius of Zr4+ relative to Ce4+.

Common synthesis methods include coprecipitation, sol-gel, hydrothermal, and solid-state routes, often followed by calcination to produce nanocrystalline powders, pellets, or thin films. Characterization usually involves X-ray diffraction to confirm the fluorite structure, along with temperature-programmed reduction/oxidation and OSC measurements to assess redox behavior and oxygen storage performance.

Applications of Ce1-xZrxO2 span catalysis and energy. In automotive catalysis, it serves as a catalyst support or promoter in three-way catalysts and diesel oxidation catalysts, leveraging high OSC and redox flexibility. In energy technologies, it is explored as an oxygen ion conducting component in solid oxide fuel cells and sensors, where enhanced ionic conductivity and thermal stability are beneficial. The material remains a focal point for tailoring redox properties through composition and nanostructuring.