Neptunium(IV) phosphide is a binary inorganic compound of neptunium metal and phosphorus with the chemical formula .
Preparation Neptunium(IV) phosphide can be formed from the fusion of stoichiometric amounts of neptunium and red phosphorus in an evacuated and sealed quartz tube at 750 °C:
Physical properties Neptunium(IV) phosphide forms black crystals of cubic crystal system, spatial group I 43d. Isostructural with .
It does not dissolve in water.
Chemical properties The compound reacts with concentrated HCl to give a green solution:
References