ErCu

ErCu is an intermetallic compound combining erbium (a rare earth element) with copper, forming a metallic material with intermediate strength and stiffness characteristics. This material belongs to the rare earth-copper intermetallic family and is primarily of research and specialized application interest rather than a widely commodified engineering material. ErCu is investigated for potential use in high-temperature applications, magnetic device components, and specialized electronic or thermal management systems where rare earth properties can be leveraged, though adoption remains limited compared to conventional copper alloys or established rare earth compounds.