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Volume Dependence of Short‐Range Force Constant and Dielectric Properties of Alkali Halides
Author(s) -
Pachauri A. K.,
Sharma A. K.,
Saxena H. C.
Publication year - 1989
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.2221550105
Subject(s) - dielectric , volume (thermodynamics) , halide , constant (computer programming) , crystal (programming language) , range (aeronautics) , alkali metal , transverse plane , thermodynamics , materials science , force constant , condensed matter physics , chemistry , physics , molecule , inorganic chemistry , composite material , organic chemistry , optoelectronics , structural engineering , computer science , engineering , programming language
A simple and useful empirical relationship showing the volume dependence of short‐range force constant is investigated. The relation is found to hold well for the variation from one crystal to the other as well as for a given crystal under changing volume. The usefulness of the relationship is demonstrated by calculating the volume derivatives of dielectric constant, and optic mode longitudinal and transverse Grüneisen parameters. The special feature of these calculations is that they do not require the detailed knowledge of the interionic potentials. The results obtained are found in good agreement with experimental data.