Articles | Volume 34, issue 2
https://doi.org/10.5194/ejm-34-167-2022
https://doi.org/10.5194/ejm-34-167-2022
Research article
 | 
24 Mar 2022
Research article |  | 24 Mar 2022

Ab initio thermal expansion and thermoelastic properties of ringwoodite (γ-Mg2SiO4) at mantle transition zone conditions

Donato Belmonte, Mattia La Fortezza, and Francesca Menescardi

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Cited articles

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Akaogi, M., Takayama, H., Kojitani, H., Kawaji, H., and Atake, T.: Low-temperature heat capacities, entropies and enthalpies of Mg2SiO4 polymorphs, and α-β-γ and post-spinel phase relations at high pressure, Phys. Chem. Miner., 34, 169–183, https://doi.org/10.1007/s00269-006-0137-3, 2007. 
Anderson, O. L.: Equations of State of Solids for Geophysics and Ceramic Science, Oxford Monographs on Geology and Geophysics No. 31, Oxford University Press, New York, ISBN 9780195056068, 1995. 
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Short summary
We carried out theoretical calculations of the vibrational and thermophysical properties of Mg2SiO4 ringwoodite, a major mineral phase of the Earth's mantle transition zone. We tried to understand why current data on volume thermal expansion are still controversial by performing a detailed analysis of vibrational spectra. We proposed a reliable parametrization for thermal expansivity of ringwoodite in the transition zone which could be useful for numerical simulations of mantle convection.