Atomic diffusion mechanisms in a binary metallic melt
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2008
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EPL (Europhysics Letters). 2008, 82(6), 66001. ISSN 0295-5075. Available under: doi: 10.1209/0295-5075/82/66001
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The relation between static structure and dynamics as measured through the diffusion coefficients in viscous multicomponent metallic melts is elucidated by the example of the binary alloy Zr64Ni36, by a combination of neutron-scattering experiments and mode-coupling theory of the glass transition. Comparison with a hard-sphere mixture shows that the relation between the different self diffusion coefficients strongly depends on chemical short-range ordering. For the Zr-Ni example, the theory predicts both diffusivities to be practically identical. The kinetics of concentration fluctuations is dramatically slower than that of self-diffusion, but the overall interdiffusion coefficient is equally large or larger due to a purely thermodynamic prefactor. This result is a general feature for non-demixing dense melts, irrespective of chemical short-range order.
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VOIGTMANN, Thomas, Andreas MEYER, Dirk HOLLAND-MORITZ, Sebastian STÜBER, Thomas HANSEN, Tobias UNRUH, 2008. Atomic diffusion mechanisms in a binary metallic melt. In: EPL (Europhysics Letters). 2008, 82(6), 66001. ISSN 0295-5075. Available under: doi: 10.1209/0295-5075/82/66001BibTex
@article{Voigtmann2008Atomi-17115,
year={2008},
doi={10.1209/0295-5075/82/66001},
title={Atomic diffusion mechanisms in a binary metallic melt},
number={6},
volume={82},
issn={0295-5075},
journal={EPL (Europhysics Letters)},
author={Voigtmann, Thomas and Meyer, Andreas and Holland-Moritz, Dirk and Stüber, Sebastian and Hansen, Thomas and Unruh, Tobias},
note={Article Number: 66001}
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