Osmium diphosphide is a binary inorganic compound of osmium metal and phosphorus with the chemical formula .

Synthesis Osmium diphosphide can be obtained by fusion of stoichiometric amounts of osmium and red phosphorus at 500-1000 °C:

Properties Osmium diphosphide forms black crystals of orthorhombic crystal system with space group Pnnm.

Uses Osmium diphosphide can be used as a semiconductor.

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