ErCo3

ErCo3 is an intermetallic compound combining erbium (a rare-earth element) with cobalt in a 1:3 stoichiometric ratio. This material belongs to the rare-earth intermetallic family and is primarily of research and specialized industrial interest rather than a commodity engineering material. ErCo3 exhibits magnetic properties typical of rare-earth–transition-metal compounds, making it relevant for applications requiring controlled magnetic behavior, high-temperature stability, or specific electronic properties; it is notably denser than many structural metals and represents a niche alternative where rare-earth magnetism or thermal characteristics outweigh cost and availability concerns.