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Oblique Phonons in Raman Scattering and IR Reflection of TeO 2 Crystal
Author(s) -
Syrbu N. N.,
Cretu R. V.,
Cebotari V. Z.,
Mushinskii V. P.
Publication year - 1996
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.2170310723
Subject(s) - raman spectroscopy , phonon , raman scattering , ionic bonding , crystal (programming language) , anisotropy , chemistry , ion , molecular vibration , x ray raman scattering , scattering , polar , molecular physics , reflection (computer programming) , condensed matter physics , optics , physics , organic chemistry , astronomy , computer science , programming language
The Raman scattering and IR reflectivity have been investigated for different crystal configurations. The contours of reflectivity spectra have been calculated. The angle dependence of polar vibrational modes in both reflectivity and Raman spectra have been investigated. The peculliarities of the transition from longitudinal mode to transverse one and vice versa both with and without changing of symmetry have been obtained. The phonon parameters and effective ionic charges of the anions and cations have been determined. It has been shown that there exists an effective ionic charge anisotropy of the oxygen and tellurium ions.