Bismuth Phosphide, BiP

No definite compound of bismuth and phosphorus appears to have been obtained in a pure condition. It has been suggested that a small quantity of the monophosphide, BiP, may be formed when the two elements are melted together, and that this is also formed as a black substance when dry phosphine acts upon bismuth trichloride, or when phosphine is passed into a solution of bismuth nitrate. It is completely decomposed when heated.