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On the pressure dependence of the Grüneisen parameter and debye temperature for CsI crystals
Author(s) -
Kulkarni R. G.,
AbdElmeguid M.,
Bukshpan S.,
Milants K.,
Verheyden J.,
Pattyn H.
Publication year - 1996
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.2221930207
Subject(s) - debye model , debye , thermodynamics , condensed matter physics , fraction (chemistry) , materials science , absorption (acoustics) , physics , chemistry , organic chemistry , composite material
An analysis of the pressure dependence of the Grüneisen parameter γ and the Debye temperature θ for CsI based on the model developed by Kumari and Dass is presented. From the pressure dependence of the recoilless fraction behaviour γ is deduced which shows that γ varies linearly with pressure as γ(p,T) = γ 0 − η p , where η is found to be pressure independent. θ( p ) also displays a linear variation with p , which is consistent with the recoilless fraction behaviour of γ‐ray emission or absorption in the Mössbauer effect for low pressures. Various thermodynamic approximations implied in the analysis are tested and found to be true.