Dynamical and elastic properties of MgSiO 3 perovskite (bridgmanite)
Résumé
We report on the lattice dynamics of MgSiO 3 perovskite (bridgmanite). Phonon spectroscopy was performed employing inelastic X-ray scattering from single crystals, and the results were confronted to ab initio calculations. We observe a remarkable agreement between experiment and theory, and provide accurate results for phonon dispersion relations, the vibrational density of states, and the full elasticity tensor. The present work constitutes an important milestone fully validating the lattice dynamics calculation against precise experimental evidence and marks a starting point to extend this kind of combined studies to the high-pressure and high-temperature conditions directly relevant for the physical properties and chemical composition of Earth's lower mantle.
Domaines
Géophysique [physics.geo-ph]| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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