Regularities of Change in Thermodynamic Characteristics of the Intermetallic Composition Ln5 Pb3 (Ln–Lanthanides)

Data on the melting temperature and enthalpy, formation enthalpy and heat capacity of intermetallics of the composition Ln5 Pb3 were obtained by a semi-empirical method. A system analysis was carried out and patterns of change in the specified properties of Ln5 Pb3 were established depending on the nature of the entire series of lanthanides. The patterns are complex in nature with the manifestation of the “tetrad effect”. A deviation from the general pattern is observed for the intermetallics of europium and ytterbium, due to their electron structure.