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A Comparative Study of Dynamical Behaviour of Ionic Lattices
Author(s) -
Gupta H. N.,
Upadhyaya R. 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.2221020111
Subject(s) - shell (structure) , ionic bonding , shell model , bromide , raman spectroscopy , dispersion (optics) , phonon , chloride , infrared , caesium , debye , dielectric dispersion , materials science , chemistry , physics , ion , condensed matter physics , optics , atomic physics , dielectric , inorganic chemistry , quantum mechanics , permittivity , composite material , optoelectronics , metallurgy
A critical study of all the three extensions of the shell model i.e. the breathing shell model (BSM), the deformable shell model (DSM), and the three‐body force shell model (TSM) is further carried out for cesium chloride type ionic crystals on the similar pattern as reported earlier. These models are applied to study comparatively the dynamical behaviour of cesium chloride (CsCI) and thallous bromide (TIBr). The results so obtained, again confirm the superiority of TSM over DSM and BSM, not only in explaining the phonon dispersion curves but also for interpreting the infrared (IR) and Raman spectral peaks and Debye temperature variations.