Magnesium Diboride Powder: Overview Magnesium diboride An inorganic compound of the molecular structure MgB2. It is an insoluble, dark gray solid. It is an hexagonal crystal structure ionic compound. It is an intercalation compounds with alternating layers boron and magnesium. Because of its superconductivity at 39.5 K (-234degC), this compound is interesting. MgB2 has a…