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Die Verdampfungsreaktion A wird durch Massenverlusteffusion im Temp.‐Bereich 107l‐1 192 K untersucht.

Manganese monophosphide and other first row transition metal phosphides have been studied by X-ray photoelectron spectroscopy in collaboration with colleagues at Ames Laboratory (U.S.D.O.E.). Electron binding energies of both valence-conduction band and core level electrons show an evolution of metallic behavior in the series ScP, TiP, VP, MnP, FeP. Phosphorus dissociation pressure measurements on MnP lead to: 4MnP (s) = 2Mn 2 P (s) + P 2(g). , AH°g 8J5 = 69.8 kcal when the data are treated by the third law method using estimated entropies. Combination of this result with published data yields: AH° 2g8 15 (MnP) =-27.2 kcal/mole which is in satisfactory agreement with the published value: AH° 2g8 15 =-23.0 kcal/mole. The apparently low value of the atomization enthalpy of MnP is confirmed and is attributed to a high valence state preparation energy.