A study of the applicability of CST towards predicting transport coefficients in liquid metals has been undertaken with particular
emphasis on alkali metals. Characteristic parameters were obtained from six different first principles calculations of inter-ionic
potentials of simple metals reported in the literature. A wide variation was observed in the characteristic parameters as reported by
various authors. Among these, the potential parameters of Shyu et al. provided the best correlation of experimental diffusivity and
viscosity data for alkali metals over moderate temperature ranges. However, use of the Goldschmidt diameter as the characteristic
distance parameter and kBTm, where Tm is the melting temperature, as the characteristic energy parameter gave as good, if not better,
results for alkali metals. This parameter set was not found to be satisfactory when non-alkali metals were also included. Chapman’s
characteristic parameters, obtained from a fit to the viscosity data, provided a reasonable correlation of the diffusivity data to most,
but not all metals studied. Fundamental issues associated with attempting to group all liquid metals under a single corresponding
states theory as well with the conventional use of the potential well-depth and the distance at which the potential becomes zero as
characteristic parameters for liquid metals have been pointed out. A preliminary statistical analysis has been performed to assess the
reliability of our predictions in view of the experimental uncertainties in viscosity and diffusivity data.
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S.Ganesh Prakash, R.Ravi, R.P.Chhabra Corresponding states theory and transport coefficients of liquid metals
