CeB6 Cathodes Cerium Hexaboride (CeB6, also known as Cerium boride) is an inorganic chemical.  It is a refractory ceramic material, which is insoluble in water or hydrochloric acid and very stable in a vacuum.  Stoichiometric samples of CeB6 have a blue metallic luster.  CeB6 is also a superconductor and semiconductor with a relatively high melting point of 2552 ℃.  Cerium Boride or (Cerium Hexaboride) is generally immediately available in most volumes.  Borides are all hard, high-melting materials with metal-like conductivity.  They are stable to nonoxidizing acids but break down in strong oxidizing agents and strong alkalis.  Cerium boride disc, also known as cerium hexaboride disc or CeB6, is a refractory ceramic material.  The main use of cerium hexaboride is a hot cathode coating or a hot cathode made of cerium hexaboride crystals.  It usually operates at a temperature of 1450 ° C.