An investigation of the structure of amorphous Co-P alloys. 2. EXAFS at the phosphorous K-edge, a feasibility study

For pt.I see ibid., vol.53, p.841-7, 1998. Amorphous Co100-xPx foils in the concentration range 13.4 ≤ x ≤ 26 were produced by electrodeposition. The extended X-ray absorption fine structure (EXAFS) at the phosphorous K-edge was measured in transmission mode. The phase shift was determined from the EXAFS spectrum of a crystalline Co2P reference sample. The EXAFS spectra of the amorphous Co-P alloys are characterized mainly by one single contribution from a shell of Co-atoms at a distance of 2.3 A around the P-atoms. A small additional contribution at a shorter distance of 2.0 A may be a hint on some direct P-P neighbours. The evaluation of reliable coordination numbers from the EXAFS spectra of the amorphous alloys is not possible. (orig.)