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Infrared lattice vibrations in Cu 2 GeSe 3
Author(s) -
Riede V.,
Sharif N.,
Neumann H.,
Sobotta H.,
Omar M. S.,
Pamplin B. R.
Publication year - 1987
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.2170220815
Subject(s) - chalcogen , lattice vibration , infrared , infrared spectroscopy , valence (chemistry) , force constant , wavenumber , molecular vibration , spectral line , materials science , chemistry , lattice (music) , lattice constant , analytical chemistry (journal) , molecular physics , crystallography , molecule , condensed matter physics , optics , phonon , diffraction , physics , organic chemistry , astronomy , chromatography , acoustics
Infrared reflectivity spectra of Cu 2 GeSe 3 are measured at room temperature in the wavenumber range from 180 to 4000 cm −1 . From an analysis of the spectra the parameters of four vibrational modes are determined. The experimental results are compared with predictions from group theory. From a comparison of the results for Cu 2 GeSe 3 with the vibrational characteristics of other chalcogenides it follows that the force constants of cation‐chalcogen bonds increase with increasing valence of the cation.