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Pressure Derivatives of Elastic Stiffness Constants under Pressure of Si and Ge
Author(s) -
Soma T.
Publication year - 1981
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.2221040131
Subject(s) - bulk modulus , formalism (music) , shear modulus , thermodynamics , stiffness , shear (geology) , chemistry , elastic modulus , materials science , crystallography , composite material , physics , art , musical , visual arts
The bulk modulus B , the shear elastic constants C 44 and C ′ = ( C 11 – C 12 )/2 under pressure of Si and Ge are studied theoretically using the presented local Heine‐Abarenkov model potential and the higher order perturbational formalism. The pressure‐derivatives d B /d P , d C 44 /d P , and d C ′/d P decrease under compression from the experimental data at low pressures, and d C 44 /d P and d C ′/d P tend to become negative below about 100 kbar.