Plutonium diboridePlutonium diboride is an compound of plutonium and boron with the chemical formula. It is one of the plutonium borides.SynthesisFusion of stoichiometric amounts of pure substances:Physical propertiesPlutonium diboride forms paramagnetic crystals of hexagonal crystal structure, space group P 6/mmm.Chemical propertiesThe compound decomposes upon heating: