Measurement of thermodiffusion in liquid Ag 60 Cu 40 .
Krüger Asbjørn Torsvik AT, Sondermann Elke E, Meyer Andreas A
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 Ag 60 Cu 40 , 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.