ReFeO2N

ReFeO₂N is an iron-based oxynitride ceramic compound that combines iron, rare-earth elements, oxygen, and nitrogen in a perovskite or perovskite-related crystal structure. This is primarily a research-phase material being investigated for applications requiring high-temperature stability and mixed ionic-electronic conductivity. The material family is notable for potential use in solid oxide fuel cells, oxygen separation membranes, and catalytic applications where conventional oxides fall short, offering improved performance through nitrogen doping that modifies electronic structure and defect chemistry compared to standard iron-rare-earth oxide ceramics.