X-RAY-EMISSION SPECTRA AND ELECTRONIC-STRUCTURES OF RED PHOSPHORUS, 3D TRANSITION-METAL PHOSPHIDES AND III-V COMPOUNDS

The P K beta emission spectra in fluorescence from red amorphous phosp horus, 3d transition-metal phosphides TiP, CrP, FeP, Fe2P, Fe3P, CoP, Co2P, Ni5P4, Ni2P, Ni3P, Cu3P, ZnP2 (black) and Zn3P2, and the semicon ducting phosphides of the III-V type, BP, A1P, GaP and InP are measure d with a high-resolution two-crystal vacuum spectrometer equipped with Ge(111) crystals. The influence of the metal atoms appears distinctly on the P K beta fluorescence emission spectra. The measured spectra a re 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 w ith the P 3s states in the valence bands of red phosphorus, GaP and In P.