Uranium disulfide is an inorganic chemical compound of uranium in oxidation state +4 and sulfur in oxidation state âÂÂ2. It is radioactive and appears in the form of black crystals.
Uranium disulfide has two allotropic forms: ñ-uranium disulfide, which is stable above the transition temperature (about 1350 ðC) and metastable below it, and ò-uranium disulfide which is stable below this temperature. The tetragonal crystal structure of ñ-US<sub>2</sub> is identical to ñ-USe<sub>2</sub>.
Uranium disulfide can be synthesized by reduction of gaseous hydrogen sulfide with uranium metal powder at elevated temperatures.