Enthalpy and heat capacity of liquid Na15Pb4 and Na50Pb50 alloys

Using an isothermal drop calorimeter, the enthalpy increment of the Na 15 Pb 4 and Na 50 Pb 50 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...

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Bibliographic Details
Published in:Thermophysics and aeromechanics 2023-09, Vol.30 (6), p.1157-1161
Main Authors: Khairulin, A. R., Stankus, S. V.
Format: Article
Language:English
Subjects:
Alkali metals
Drop calorimeters
Enthalpy
Melts
Physics
Physics and Astronomy
Specific heat
Thermodynamics
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Summary:Using an isothermal drop calorimeter, the enthalpy increment of the Na 15 Pb 4 and Na 50 Pb 50 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 existing ideas that various complexes with a partially ionic character of the interatomic interaction are formed in the melts of alkali metals with lead systems.
ISSN:1531-8699
0869-8643
1531-8699
DOI:10.1134/S0869864323060185