Uranium oxysulphide

Uranium Oxysulphide, U3O2S4 or UO3.2US2, is formed when uranous oxide, urano-uranic oxide, or ammonium uranate is heated in a stream of hydrogen sulphide or carbon disulphide vapour when one of the oxides is heated with a mixture of ammonium chloride and sulphur or when uranyl sulphate is heated in hydrogen or with potassium pentasulphide. It is a greyish-black powder, which is decomposed by nitric acid %vith deposition of sulphur. 

ThSe2(cr) in vacuo at 1223 K. ThOSe(cr) was found to be isomorphous with thorium and uranium oxysulphides. 

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See also in sourсe #XX -- [ ]

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