Viscosity of the InBi–Pb Melts

The temperature dependences of the dynamic viscosity of the InBi100 – xPbx (where x = 19, 40, 60, 80, and 100 at %) melts are studied in the range from the liquidus temperature to 1200 K by the oscillating crucible method. The temperature dependences of the viscosities of melts of these compositions are well described by the Arrhenius equation. The viscosity of the InBi–Pb melts at a constant temperature has small negative deviations from the ideal mixture viscosity. The activation energy of a viscous flow has negative deviations from additive values with a minimum near 20 at % Pb. The concentration dependences of the viscosities of the melts are calculated using the well-known equations based on the thermodynamic properties. The obtained results are compared with the experimental data.