Premium
Optical Phonons and Chemical Bonding in TlSbS 2 , TlSbSe 2 , and Tl 3 SbS 3 Crystals
Author(s) -
Syrbu N. N.,
Krasovsky V. T.,
Grincheshen I. N.
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280319
Subject(s) - phonon , dielectric , dispersion (optics) , polarization (electrochemistry) , infrared , dispersion relation , effective nuclear charge , materials science , crystal (programming language) , dielectric dispersion , condensed matter physics , ion , optics , chemistry , physics , permittivity , optoelectronics , computer science , programming language , organic chemistry
The optical phonons at k = 0 of TlSbS 2 , TlSbSe 2 , and Tl 3 SbS 3 have been investigated by infrared reflectivity measurements from 50 to 4000 cm −1 at 300 K. The factor group analysis of vibrational modes of TlSbS 2 and Tl 3 SbS 3 crystal lattices has been made. The dielectric constant dispersion for E ‖ a and E ‖ b has been determined by classical dispersion relations. The Szigeti effective charges, the Born dynamic effective charge, and the Tl, Sb, S (Se) relative ion charges were calculated in dependence on the polarization of the incident light.