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Volume Dependence of Effective Charge Parameter and Photoelastic Behaviour of Alkali Halide Crystals
Author(s) -
Dikshit U. C.,
Kumar M.
Publication year - 1992
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.2221710213
Subject(s) - polarizability , halide , dipole , alkali metal , charge (physics) , range (aeronautics) , additive function , equation of state , deformation (meteorology) , chemistry , materials science , thermodynamics , computational chemistry , molecular physics , condensed matter physics , physics , quantum mechanics , inorganic chemistry , organic chemistry , mathematics , molecule , composite material , mathematical analysis
An analysis of the volume dependence of effective charge parameter and electronic strain polarizability parameter is presented for alkali halide crystals. The deformation dipole model due to Hardy is used along with the seven different potential forms for the short‐range overlap repulsive energy and the modified form of the additivity rule for the crystalline state polarizabilities as proposed by Raghurama and Narayan. The effective charge model due to Hanlon and Lawson is adopted to obtain the strain polarizability parameter within the framework of Coker's theory. The results are compared with the available experimental data. It is found that the results are fairly insensitive to the form of the overlap repulsive potential used whereas they depend sensitively upon the choice of polarizability.