VISCOSITY, HARD-SPHERE DIAMETER AND INTER-IONIC POTENTIAL FOR LIQUID LEAD

The Macedo-Litovitz equation for a hard sphere liquid provides a satisfactory model for the viscosity of lead up to 1400 K. The packing fraction at the melting point ( zeta //m equals 0. 472) and the T** one-half temperature dependence of the hard core size sigma are in good agreement with other results deduced from Enskog's theory and molecular dynamics. The activation energy for viscosity (0. 07 eV) is similar to the height of the interionic potential barrier calculated from the correlation functions determined by means of neutro diffraction, and the Percus-Yevick theory.