Cu8O7

Cu₈O₇ is a mixed-valence copper oxide ceramic compound that exists as an intermediate phase in the copper–oxygen system, typically formed at elevated temperatures or as a metastable phase. While not commonly used as a primary engineering material in commercial applications, it is of interest in materials research for its electrical and catalytic properties, and as a precursor or byproduct in copper metallurgy and oxide processing. Engineers and researchers encounter this phase primarily in high-temperature oxidation studies, catalytic applications, and fundamental investigations of copper oxide phase stability rather than in load-bearing or structural roles.