Density, thermal expansion and binary diffusion coefficients of sodium-lead melts

摘要

The density and the thermal expansion coefficients of liquid sodium and sodium-lead alloys (2.50. 5.00. 7.50. 9.99. 21.03. 30.77. 41.10. 50.00. 63.50 and 70.01 at. % Pb) have been determined by using the γ-ray attenuation technique over the temperature range from the liquidus line to 950 K. The experimental uncertainty of the density measurements is estimated to be within ±0.4%. The coefficients of mutual diffusion for a Na_(50)Pb_(50) melt have been measured. The data from literature and experiment on the volumetric properties and binary diffusion for the Na-Pb liquid system have been summarised. The composition dependences of molar volume, volumetric thermal expansion coefficient and interdiffusion coefficient in the liquid state have been constructed and discussed.