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Barium phosphide has the molecular formula of Ba3P2 and the molecular weight of 182.1825 g/mol. Its CAS number is 12380-72-2. It is a red-brown crystalline material with a melting point of 1585 °C. Its density is 2.51 g/cm³. It readily reacts with water to form phosphine, PH3, but is insoluble in ethanol. It is easily prepared by reacting the metal with red phosphorus at high temperature. The best way is to sublime the P4 at 450 °C in an inert gas stream and react it with Ba metal at 600 °C: 6Ba + 2P4 2Ba3P4

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Barium Phosphide is a semiconductor used in highpower, high-frequency applications and in laser diodes. It crystallizes in the body-centered cubic mode. The standard Gibbs energies of formation of barium phosphide was determined by a chemical equilibration technique yielding the following results.

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D.F. Goldsmith Chemical & Metal Corp.	--		United States	793	66

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