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Evaluation of Photoelastic Constants and Strain Derivatives of the Static Dielectric Constant of Silver and Thallium Halides
Author(s) -
Verma T. S.,
Kumar V.,
Shanker J.
Publication year - 1984
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.2221210206
Subject(s) - polarizability , dielectric , thallium , halide , dipole , range (aeronautics) , chemistry , van der waals force , ion , computational chemistry , condensed matter physics , materials science , inorganic chemistry , composite material , molecule , physics , organic chemistry , optoelectronics
A method for calculating the photoelastic constants and strain derivatives of static dielectric constant for silver and thallium halide crystals, which crystallize in NaCl and CsCl structures, respectively, is developed. The shell model formulation, which takes into account the polarizability of positive as well as negative ions and considers also the effect of Lundqvist's three‐body interaction, is used in the present calculation. The short‐range overlap repulsive interactions between first and second neighbours as well as the van der Waals dipole—dipole interactions are also considered in evaluating the short‐range force parameters which are used for the calculation of the photoelastic constants and the strain derivatives of the dielectric constant. The results are found to compare well with available experimental data.