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Measurement of thermodiffusion in liquid Ag 60 Cu 40
Asbjørn Torsvik Krüger1, Elke Sondermann2, Andreas Meyer1
1Institute for Frontier Materials on Earth and in Space, German Aerospace Center (DLR), Linder Höhe, 51147, Cologne, Germany.
Abstract:
Thermodiffusion, or the Soret effect, designates a diffusive motion of particles driven by a temperature gradient, leading to a build-up of a concentration gradient. This effect is here measured in the liquid state on the eutectic alloy , which shows negligible excess volume. No significant thermodiffusion was observed using both in situ X-ray radiography or ex situ energy-dispersive X-ray spectroscopy on separately solidified parts of the sample. This is in contrast to the significant Soret coefficients observed in molten Ag-Al and Al-Ni. Molecular dynamics simulations of thermodiffusion in liquid Ag-Cu [Sarder et al., Philos. Mag. 99, 468-491 (2019)] report significantly stronger thermodiffusion. However, the trend that thermodiffusion in liquid Ag-Cu is weaker than in other liquid alloys like Al-Ni is supported by our experiment.
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