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Lead-lithium alloys are of great interest for practice as the advanced materials to be used in new technique, nuclear energetics, and so forth. Terefore, study on the physico-chemical properties of the latter is of major significance. An analysis of the available literature shows that there are a few works, devoted to study of Pb-Li alloys densities. However, temperature dependence of the density ρ(T), and its temperature coefficient K=dρ/dT for eutectic alloy were obtained by either extrapolation of the density data up to the eutectic alloy’s composition, or calculation method. There is a certain discrepancy amounting to as high as 4%, while the allowable error in the density measurements is less than 0.5%. The discrepancy between the results for the temperature coefficients of density amounts to 80%.In this work we present the experimental data on the temperature dependence of Pb_ 0.83 Li_ 0.17 eutectic alloy’s density in the temperature range 520K to 643 K. The alloys were prepared using Pb and Li with 99.999% and 99.8% contents of the basic elements, respectively. We use the improved device, which permits to get the results with error less than 0.15%. The results of 115 measurements of density in 520K to 643K temperature range were processed by the least-square method. Density polytherm of Pb_ 0.83 Li_ 0.17 eutectic alloy is described by linear equation ρ(T)=9507.89-0.79813(T-508), kg/m~ 3 ,where T is the absolute temperature by K. Mearsurement error was 0.12% at 95% reliability. Discrepancy in the temperature coefficient data was 1.08%.Thus, the temperature dependence of the Pb-Li eutectic alloy density was studied by the precise two-capillary method. The obtained results may be recommended as the most reliable reference data.
Lead-lithium alloys are of great interest for practice as the advanced materials to be used in new technique, nuclear energetics, and so forth. Terefore, study on the physico-chemical properties of the latter is of major significance. An analysis of the available literature shows that there are a few works, devoted to study of Pb-Li alloys densities. However, temperature dependence of the density ρ (T), and its temperature coefficient K = dρ / dT for eutectic alloy were obtained by either extrapolation of the density data up to the eutectic alloy’s composition, or calculation method. There is a certain discrepancy amounting to as high as 4%, while the allowable error in the density measurements is less than 0.5%. The discrepancy between the results for the temperature coefficients of density amounts to 80% .In this work we present the experimental data on the temperature dependence of Pb_ 0.83 Li_ 0.17 eutectic alloy’s density in the temperature range 520K to 643 K. The alloys were prepare d using Pb and Li with 99.999% and 99.8% contents of the basic elements, respectively. We use the improved device, which permits to get the results with error less than 0.15%. The results of 115 measurements of density in 520K to 643K temperature Density polytherm of Pb 0.83 Li 0.17 eutectic alloy is described by linear equation ρ (T) = 9507.89-0.79813 (T-508), kg / m 3, where T is the absolute temperature by K. Mearsurement error was 0.12% at 95% reliability. Discrepancy in the temperature coefficient data was 1.08%. Thus, the temperature dependence of the Pb-Li eutectic alloy density was studied by the precise two-capillary method. be recommended as the most reliable reference data