Thermophysical Properties of Liquid K–Pb Alloys

The thermal conductivity and the enthalpy increment of K–Pb alloys with a Pb content of 50.00 and 66.67 at. % have been measured by the laser flash method and drop calorimetry in the temperature range from the liquidus line to 1073...1273 K. Based on the measurement results, the specific heat capacity and the thermal diffusivity of the melts have been calculated. Approximation equations for the temperature dependences of the studied properties have been obtained, and tables of reference data have been developed. The concentration dependences of the transport and caloric properties of the K–Pb system demonstrate significant deviations from calculations according to the additivity rule and the presence of extrema in the region of the equiatomic composition.