STUDY OF THE L-3 EDGES OF ION-BEAM-MIXED PD-CU ALLOYS BY X-RAY-ABSORPTION SPECTROSCOPY

X-ray absorption spectroscopy (XAS) at the L-3 edge of Pd is used to i nvestigate the electronic structure of ion-beam-mixed Pd-Cu alloys wit h a wide composition range (0.1 less than or equal to x less than or e qual to 0.9). The formation of chemical bonds between Pd and Cu affect s the occupancy and/or hybridization of the d states, and this change is revealed in the white line intensities. It is found that, within io n-beam-mixed Pd-Cu alloys, there is a substantial decrease in the area of the Pd L-3 white lines upon increasing the Cu concentration. This result implies that upon alloying with Cu there is a gradual filling o f the Pd d band. The amount of d-charge transfer at the Pd site of ion -beam-mixed Pd-Cu alloys has been estimated on the basis of the change within the white line.