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Kawakita, Yukinobu
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article
Structure of eutectic liquids in the Au-Si, Au-Ge, and Ag-Ge binary systems by neutron diffraction
Abstract
Neutron diffraction was used to investigate the structure of the liquid alloys Au<sub>0.81</sub>Si<sub>0.19</sub>, Au<sub>0.72</sub>Ge<sub>0.28</sub>, and Ag<sub>0.74</sub>Ge<sub>0.26</sub> with composition at or near the eutectic. For a given alloy, the measured pair distribution function is described over a wide range of distances, from 5–6 Å to beyond 20 Å, by an exponentially damped oscillatory function with a decay length and wavelength of oscillation related to the half-width at half-maximum of the principal peak in the total structure factor and to the position of this peak, respectively. This behavior is expected from solutions of the Ornstein-Zernike equations for simple pair potentials. There is no need to invoke the existence of a fractal network, as suggested by a recent analysis of the diffraction patterns measured for amorphous metallic alloys, to account for the experimental results. A reconsideration of the diffraction data for these amorphous alloys points to the same conclusion.