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A Theoretical and Experimental Study of the Enthalpies of Formation of LaNi 5 ‐Type Compounds
Author(s) -
Pasturel A.,
Colinet C.,
Allibert C.,
Hicter P.,
PercheronGuegan A.,
Achard J. C.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221250110
Subject(s) - standard enthalpy of formation , standard enthalpy change of formation , rare earth , thermodynamics , metal , type (biology) , lanthanide , binding energy , chemistry , materials science , physics , mineralogy , metallurgy , atomic physics , organic chemistry , geology , ion , paleontology
The heats of formation of LaNi 5 ‐type compounds are computed within a tight‐binding scheme for the d‐band. It is shown that the relatively large difference between the energy levels of the two elements is a dominant factor in the determination of the formation energy. The evolution of the energy level of the rare‐earth metal can explain the experimental behaviour of the heats of formation of the RNi 5 compounds along the rare‐earth series. In order to discuss the calculated results the enthalpies of formation of LaNi 5 , PrNi 5 , SmNi 5 , and YNi 5 are determined by a calorimetric method.