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Farinfrared absorption in Al2O3 and MgO |
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| Authors: | D. Billard F. Gervais B. Piriou |
| Affiliation: | (1) U.E.R. Sciences Fondamentales et Appliquées, Université d'Orléans, 45046 Orléans Cedex, France;(2) Centre de Recherche sur la Physique des Hautes Températures, C.N.R.S., 45045 Orléans Cedex, France;(3) Laboratoire des Eléments de Transition dans les Solides, C.N.R.S., 92190 Meudon Bellevue, France |
| Abstract: | Far-infrared absorption measurements performed in Al2O3 and MgO between 300 and 1 500 K with a Fourier scanning interferometer are reported. A temperature analysis of results based on a phonon self-energy model allows to assign the absorption in this region to 2- and 3-phonon difference processes. The contributions of these processes are separated and discussed. In Al2O3, the frequency dependence of the absorption is also analyzed. A good overall agreement between theory and experiment is evidenced. |
| Keywords: | Al2O3 MgO far-infrared spectroscopy far-infrared absorption multiphonon processes |
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