Experimental and calculated EXAFS spectra of a binary amorphous alloy

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Abstract
The Cu K shell EXAFS spectrum of a binary amorphous alloy of Cu57Zr43 has been calculated using a model structure generated by computer. The results showed a general agreement with the experimental spectrum measured for a melt-spun amorphous alloy with the same composition. Calculation showed that interference between two partial spectra of different pairs and structural disorder inherent in the amorphous structure seriously reduced the magnitude of the spectrum, making it difficult to deduce structural information from the measured EXAFS spectrum. However, the multiple scattering contribution to the EXAFS spectrum is found to be negligibly small, as well as the contribution from the atoms which are not nearest neighbours, compared with the nearest neighbour contributions; the EXAFS measurement can be useful for obtaining structural information on the nearest neighbours shells of binary amorphous alloys, if combined with complementary information.
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