Self- and interdiffusion in dilute liquid germanium-based alloys

Self- and inter-diffusion coefficients in liquid Ge and dilute Ge-based Ge-Si, Ge-Au, Ge-In, Ge-Ce and Ge-Gd alloys-containing 2 at% additions, respectively, are measured using a comprehensive approach of measuring techniques: quasi-elastic neutron scattering, in situ long-capillary experiments comb...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2019-11, Vol.31 (45), p.455101-455101
Main Authors: Weis, H, Kargl, F, Kolbe, M, Koza, M M, Unruh, T, Meyer, A
Format: Article
Language:English
Subjects:
liquid germanium
long-capillary
microgravity
quasielastic neutron scattering
self diffusion
solute diffusion
x-ray radiography
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Summary:Self- and inter-diffusion coefficients in liquid Ge and dilute Ge-based Ge-Si, Ge-Au, Ge-In, Ge-Ce and Ge-Gd alloys-containing 2 at% additions, respectively, are measured using a comprehensive approach of measuring techniques: quasi-elastic neutron scattering, in situ long-capillary experiments combined with x-ray radiography, and a long-capillary experiment under microgravity conditions. Resulting inter- and Ge self-diffusion coefficients are equal within error bars for each investigated alloy. The interdiffusion coefficients are smaller for the alloys containing Ce and Gd, However, no dependence of the atomic mass of the minor additions, that varies by about a factor of seven between Si and Au, on the diffusion coefficients could be observed. This demonstrates that in a loosely-packed metallic liquid with fast diffusive dynamics the diffusion mechanism is highly collective in nature.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab354e