N. P. Malomuzh, V. N. Makhlaychuk
ABSTRACT
The paper discusses the behavior of the coefficients of shear viscosity and self-diffusion in liquid transition and post-transition metals, as well as their melts. It is shown that the application of activation concepts to the description of temperature dependences of the coefficients of shear viscosity and self-diffusion is incorrect. It is established that the shear viscosity of transition and post-transition metals is described with high accuracy by the same formulas as for alkali metals. This means that the key role in the formation of viscosity is played by the effects of the “roughness” of molecular layers shifting relative to each other. It is shown that self-diffusion coefficients should be considered as a superposition of two independent contributions – chaotic local mixing and collective drift, which is a characteristic feature of only the liquid state of matter. The values of the ion radii of the metals under consideration are discussed.
KEYWORDS
self-diffusion coefficient, shear viscosity, liquid transition and post-transition metals