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Elastic behaviour of mixed alkali halide crystals of rocksalt structure
Author(s) -
Basu C.,
Kanrar A.,
Ghosh U. S.
Publication year - 1982
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.2221140126
Subject(s) - halide , alkali metal , shell model , lattice constant , lattice (music) , thermodynamics , crystal (programming language) , chemistry , crystal structure , materials science , crystallography , inorganic chemistry , physics , diffraction , organic chemistry , optics , atomic physics , computer science , acoustics , programming language
The dependence of the elastic constants on the relative concentration of the constituents of mixed alkali halide crystals of rocksalt structure is investigated using the pseudo‐unit cell model for the mixed crystal as illustrated by Chang and Mitra and the deformable shell model for the lattice dynamics as developed by Basu and Sengupta. Expressions are derived for the three independent elastic constants C 11 , C 12 , and C 44 of the mixed system in terms of the relative concentration of the constituents and certain parameters pertaining to the terminal crystals. The theory thus developed is applied with remarkable success to the case of the mixed crystal KCl–KBr for which detailed experimental data are available.