BaB6

Barium hexaboride (BaB₆) is a ceramic compound belonging to the hexaboride family, characterized by a crystal structure combining barium cations with a boron cage framework. It is primarily valued as a thermionic electron emitter and cathode material, where its low work function and high thermal stability make it superior to tungsten alternatives in high-temperature vacuum applications. The material also sees emerging use in specialized wear-resistant coatings and cutting tools where its hardness and chemical inertness provide advantages, though it remains less common than competing ceramics in mainstream industrial production.