The structure of liquid metals probed by XAS
1 Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, I-67100 L’Aquila, Italy
2 Scuola di Scienze e Tecnologie, Sezione di Fisica, Camerino, I-62032, Macerata, Italy
3 CNR-Istituto Officina dei Materiali-Perugia, I-06123 Perugia, Italy
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Published online: 21 August 2017
X-ray absorption spectroscopy (XAS) is a powerful technique to investigate the short-range order around selected atomic species in condensed matter. The theoretical framework and previous applications to undercooled elemental liquid metals are briefly reviewed. Specific results on undercooled liquid Ni obtained using a peak fitting approach validated on the spectra of solid Ni are presented. This method provides a clear evidence that a signature from close packed triangular configurations of nearest neighbors survives in the liquid state and is clearly detectable below k ≈ 5 Å−1, stimulating the improvement of data-analysis methods that account properly for the ensemble average, such as Reverse Monte Carlo.
© The Authors, published by EDP Sciences, 2017
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