Vibrational spectra of a Ca-Nb-Ga garnet (CNGG) single crystal studied by Raman and infrared reflectivity spectroscopy
| Autor: | B Wyncke, F Bréhat, Kiyoshi Shimamura, T. Fukuda, C. Carabatos-Nédelec, P. Becker |
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| Rok vydání: | 1998 |
| Předmět: |
Infrared
business.industry Phonon Chemistry Scattering Oscillator strength Infrared spectroscopy Atmospheric temperature range Condensed Matter Physics Molecular physics Condensed Matter::Materials Science symbols.namesake Optics symbols General Materials Science business Raman spectroscopy Spectroscopy |
| Zdroj: | Journal of Physics: Condensed Matter. 10:6865-6873 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/10/31/005 |
| Popis: | Calcium niobium gallium garnet (CNGG), a new non-linear optical material, is studied by Raman and infrared reflectivity spectroscopy at low and at room temperature for various scattering configurations. No structural phase transition is observed in the temperature range of the experiments. The phonons are classified within their symmetry species in the space group assumption; their dynamical parameters such as wavenumber, damping and oscillator strength are obtained on the basis of the infrared reflectivity spectra analysis. The comparison of the infrared and Raman activity of the phonon modes is in favour of the aforementioned space group; however, Pockels electrooptic coefficient room temperature measurements did not allow us to confirm this space group. |
| Databáze: | OpenAIRE |
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