Antimony Thiophosphate, SbPS₄

Antimony Thiophosphate, SbPS₄, is obtained as a residue, after the evolution of antimony thiochloride and phosphorus pentachloride, on heating together antimony trichloride (or antimony trisulphide) and phosphorus pentasulphide. It is a yellow powder which has an odour of hydrogen sulphide. It is decomposed by heating. It is insoluble in water, dilute hydrochloric and sulphuric acids and various organic solvents, but it is decomposed by treatment with concentrated sulphuric acid, alkalis or even ammonium hydroxide.