Influence of structural changes on diffusion in liquid germanium

Chathoth, S. M.; Damaschke, B.; Unruh, T.; Samwer, K.
June 2009
Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p221906
Academic Journal
Liquid germanium exhibits a change in the bonding character from being more covalent to more metallic while heating. We used quasielastic neutron scattering to measure the absolute value of self-diffusion coefficients in this liquid. Compared to other monoatomic liquids, such as liquid Ni or Ti, the self-diffusivity is an order faster near the melting temperature and shows a non-Arrhenius-like behavior. Above 1325 K, the activation energy for self-diffusion is low and obeys Stokes–Einstein relation. Even though the packing density of liquid germanium is less than that of simple metallic melts such as Pb or Sn, the temperature dependence of self-diffusivity does not exhibit D∝Tn(n≃2) form, which is observed for uncorrelated binary collisions of hard-spheres.


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