Uranium Boride, UB₂

Uranium Boride, UB₂, is obtained in silvery-grey fragments by passing an electric arc between electrodes (made by compressing an intimate mixture of powdered metallic uranium and amorphous boron) in a vacuum electric furnace. The boride is stable towards alkalies and acids, except hydrofluoric and nitric acids. It is readily attacked by fused alkali hydroxide.