Nb4 Si4 Ir4

Nb₄Si₄Ir₄ is a quaternary intermetallic compound combining niobium, silicon, and iridium in equal atomic proportions, belonging to the refractory metal silicide family. This material is primarily of research and developmental interest for ultra-high-temperature applications where exceptional thermal stability and oxidation resistance are required beyond the capability of conventional superalloys. The addition of iridium to niobium-silicon systems is explored to enhance fracture toughness and creep resistance, making it a candidate for next-generation aerospace propulsion systems and power generation at extreme temperatures where nickel-based superalloys reach their limits.