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Dynamical and elastic properties of MgSiO3 perovskite (bridgmanite)

Bosak, Alexeï
Nazzareni, Sabrina
Antonangeli, Daniele
Mirone, Alessandro
Chaplot, Samrath Lal
Mittal, Ranjan
Ohtani, Eiji
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Published in Geophysical Research Letters. 2016, vol. 43
Abstract We report on the lattice dynamics of MgSiO3 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.
Keywords Lattice dynamicsMgSiO3PerovskiteBridgmaniteElasticityPhonons
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Research group Groupe Ruegg
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WEHINGER, Björn et al. Dynamical and elastic properties of MgSiO3 perovskite (bridgmanite). In: Geophysical Research Letters, 2016, vol. 43. https://archive-ouverte.unige.ch/unige:82274

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Deposited on : 2016-04-04

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