Atomic diffusion mechanisms in a binary metallic melt

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autor(en): Voigtmann T, Meyer A, Holland-Moritz D, Stüber S, Hansen T, Unruh T
Zeitschrift: EPL - Europhysics Letters
Jahr der Veröffentlichung: 2008
Band: 82
Heftnummer: 6
ISSN: 0295-5075


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 Zr(64)Ni(36), 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. Copyright (C) EPLA, 2008.

FAU-Autoren / FAU-Herausgeber

Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)

Autor(en) der externen Einrichtung(en)
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
Institute Laue-Langevin (ILL)
Technische Universität München (TUM)


Voigtmann, T., Meyer, A., Holland-Moritz, D., Stüber, S., Hansen, T., & Unruh, T. (2008). Atomic diffusion mechanisms in a binary metallic melt. EPL - Europhysics Letters, 82(6).

Voigtmann, Thomas, et al. "Atomic diffusion mechanisms in a binary metallic melt." EPL - Europhysics Letters 82.6 (2008).


Zuletzt aktualisiert 2018-08-08 um 03:02