Taking advantage of the high sensitivity of the Ce valence to the local environment, we investigated the early stage of the solid-state reaction in Ce/Ni multilayers through x-ray absorption spectroscopy. Ce I.ill-edge and Ni E-edge spectra have been compared to distributions of experimental spectra obtained from amorphous Ce-Ni alloys. Two possible difFusion proNes have been examined. It is found that the experimental data are compatible with the formation of a homogeneous amorphous-alloy interlayer instead of a Fickian profile.
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