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Application of the Random‐Element Isodisplacement Model to Long‐Wavelength Optical Phonons in CdSe x Te 1− x Mixed Crystals
Author(s) -
Górska M.,
Nazarewicz W.
Publication year - 1974
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.2220650117
Subject(s) - wurtzite crystal structure , phonon , wavelength , spectral line , materials science , reflection (computer programming) , condensed matter physics , discontinuity (linguistics) , molecular physics , optics , physics , optoelectronics , diffraction , mathematics , mathematical analysis , astronomy , computer science , programming language
Abstract Infrared reflection spectra from mixed crystals CdSe x Te 1– x (0 ≦ x ≦ 1) have been investigated in the spectral region from 90 to 300 cm −1 at room temperature. The spectra contain two distinct reststrahlen bands whose strengths and frequencies depend on the composition, x . Using Kramers‐Kronig analysis the frequencies of long wavelength optical phonons were obtained. It is established, that the dependence of the phonon frequencies on the composition of crystals does not show any discontinuity when changing the structure of the mixture from zincblende to wurtzite. The calculations, based on the random‐element isodisplacement (REI) model, of the dependence of long‐wavelength optical phonon frequencies on the composition x are in good agreement with the experimental results.