Dynamical and elastic properties of MgSiO3 perovskite (bridgmanite)

Björn Wehinger1,2, Alexeï Bosak3, Sabrina Nazzareni4, Daniele Antonangeli5, Alessandro Mirone3, Samrath Lal Chaplot6, Ranjan Mittal6, Eiji Ohtani7, Anton Shatskiy8,9, Surendra Saxena10, Subrata Ghose 11,12, and Michael Krisch3  “Dynamical and Elastic Properties of MgSiO3 Perovskite (bridgmanite).” Geophysical Research Letters,2016

1Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland,

2Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen, Switzerland,

3European Synchrotron Radiation Facility, Grenoble, France,

4Department of Physics and Geology, University of Perugia, Perugia, Italy, 5Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), UMR CNRS 7590, Sorbonne Universités – UPMC, Muséum National d’Histoire Naturelle, Paris, France,

6Solid State Physics Division, Bhabha Atomic Research Centre, Bombay, India,

7Department of Earth Science, Graduate School of Science, Tohoku University, Sendai, Japan,

8V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia,

9Department of Geology and Geophysics, Novosibirsk State University,
Novosibirsk, Russia,

10Center for the Study of Matter at Extreme Conditions, Florida International University, Miami, USA,

11Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA,

12 Deceased 21 January 2015

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.

http://onlinelibrary.wiley.com/doi/10.1002/2016GL067970/abstract