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Theory of Photoelastic Constants of Alkali Halide Crystals
Author(s) -
Shanker J.,
Verma T. S.
Publication year - 1980
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.2220990139
Subject(s) - polarizability , halide , alkali metal , van der waals force , ionic crystal , range (aeronautics) , chemistry , ionic bonding , computational chemistry , inorganic chemistry , materials science , ion , molecule , organic chemistry , composite material
A theoretical model for evaluating the photoelastic constants of ionic crystals, is developed by considering the short range repulsive interactions between nearest and next nearest neighbours, the van der Waals potentials, and three body interactions as well as the electronic polarizabilities of cations and anions. The model is applied to calculate the photoelastic constants of alkali halide crystals with NaCI structure. The results obtained are in good agreement with experimental data. The importance of the short range polarizability effect is demonstrated in determining the photo‐elastic constants of the crystals under investigation.