Enthalpy and heat capacity of liquid Na15Pb4 and Na50Pb50 alloys
A.R. Khairulin, S.V. Stankus
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: drop calorimetry, sodium-lead alloys, enthalpy, heat capacity, solid and liquid states
Abstract
Using isothermal drop calorimeter, the enthalpy increment of the Na15Pb4 and Na50Pb50 alloys was measured and the heat capacity was determined in the temperature range of 420-1075 K, including the solid and liquid states. It has been established that the values of the heat capacity of melts significantly exceed the calculations of this value according to the laws for an ideal solution, and this difference decreases with increasing temperature. The obtained results confirm the currently known fact that various complexes with a partially ionic character of the interatomic interaction are formed in melts of alkali metals with lead systems.
|
