Titanium Sesquisulphide, Ti₂S₃

Titanium Sesquisulphide, Ti₂S₃, is produced when titanic oxide is heated to bright redness in a stream of moist sulphuretted hydrogen and carbon disulphide vapour; when the nitride, TiN, is heated in a mixture of sulphur vapour and hydrogen; and also when the disulphide, TiS₂, is ignited in an indifferent atmosphere. Titanium sesquisulphide is a metallic, greyish black, crystalline powder which is stable towards dilute acids and alkalis, but dissolves in concentrated sulphuric and nitric acids, forming green solutions of unknown composition.