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Strain Derivatives of Dielectric Constants of MgO and Thallous Halides
Author(s) -
Srinivasan K.,
Raghavan S. Lakshmi
Publication year - 1986
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.2221370104
Subject(s) - polarizability , halide , dielectric , strain (injury) , anisotropy , shell (structure) , ion , materials science , chemistry , condensed matter physics , inorganic chemistry , optics , molecule , physics , composite material , organic chemistry , optoelectronics , medicine
Calculations are made to determine strain derivatives of static and high‐frequency dielectric constants of MgO, TlCl, and TlBr, using the two‐ion polarizable shell model. The calculated values of pressure derivatives of the static dielectric constant of MgO, TlCl, and TlBr are in good agreement with the experimental values. A reasonable agreement is seen between the calculated values and the measured values of strain‐optical constants for MgO. Strain‐optical constants are also calculated for thallous halides. Anisotropy in the polarizability of ions arising from strain is fairly accounted for by the shell model through the large contributions from overlap forces.