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Dynamical study of the temperature dependence of grüneisen parameters in alkali metals
Author(s) -
Singh V. P.,
Hemkar M. P.
Publication year - 1976
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.2220780139
Subject(s) - brillouin zone , alkali metal , wave vector , symmetry (geometry) , space (punctuation) , function (biology) , thermodynamics , condensed matter physics , chemistry , materials science , physics , quantum mechanics , mathematics , geometry , linguistics , philosophy , evolutionary biology , biology
Using a non‐central force model the microscopic Grüneisen parameters γ q , j and the effective value γ G at different temperatures are calculated for the alkali metals in terms of elastic constants and their pressure derivatives. The microscopic Grüneisen parameters γ q , j are calculated as a function of wave vector q along the principal symmetry directions [100], [110], [111], [210], [211], and [221] and the values are averaged over the wave vector space in the first Brillouin zone using the modified Houston spherical six term integration method. The results obtained for γ G show a fairly good agreement with the experimental observations.