The temperature dependence of the Raman spectra of some alkaline earth crystals with the fluorite structure
- 14 April 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 10 (7) , 1063-1072
- https://doi.org/10.1088/0022-3719/10/7/016
Abstract
The temperature dependence of the one-phonon Raman bands in single crystals of CaF2, BaF2, SrF2 and SrCl2 has been investigated over the temperature range 15-1300K. The frequency shifts and linewidths are calculated according to quasi-harmonic theory. Agreement is satisfactory for T< Theta , the Debye temperature, indicating a two-phonon decay process. A small contribution due to anharmonic effects becomes evident above the Debye temperature for all crystals. The temperature dependence of the Raman-active frequencies is found to increase in the order CaF222. Gruneisen parameters are determined and the results compared with pressure dependent measurements of the optical phonon frequencies.Keywords
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