Cerium hexaboride
（重定向自Cerium boride）
![](/Images/godic/202501/03/CaHexaboride4339.jpg")
![A cerium hexaboride top hat cathode. Image courtesy of Applied Physics Technologies](/Images/godic/202501/03/Cebixtophat4339.JPG")
Cerium hexaboride (CeB6, also called cerium boride, CeBix, CEBIX, and (incorrectly) CeB) is an inorganic chemical, a boride of cerium. It is a refractory ceramic material. It has low work function and one of the highest electron emissivity known, and is stable in vacuum. The principal use of cerium hexaboride is a coating of hot cathodes, or hot cathodes made of cerium hexaboride crystals. It usually operates at temperature of 1450 °C.