X-Ray Emission Spectra and Electronic Structuresof Red Phosphorus, 3d Transition-MetalPhosphides and III--V Compounds

Abstract

The P Kβ emission spectra in fluorescence from red amorphous phosphorus, 3d transition-metal phosphides TiP, CrP, FeP, Fe₂P, Fe₃P, CoP, Co₂P, Ni₅P₄, Ni₂P, Ni₃P, Cu₃P, ZnP₂ (black) and Zn₃P₂, and the semiconducting phosphides of the III-V type, BP, AlP, GaP and InP are measured with a high-resolution two-crystal vacuum spectrometer equipped with Ge(111) crystals. The influence of the metal atoms appears distinctly on the P Kβ fluorescence emission spectra. The measured spectra are compared with available X-ray emission and XPS valence-band spectra and theoretical energy-band calculations on a common energy scale. It is shown that considerable p-d, s mixing occurs in the valence bands of the 3d transition-metal phosphides and the P 3p states mix fairly with the P 3s states in the valence bands of red phosphorus, Gap and InP