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Open AccessArticle

First Principles Calculation of the Stability of Iron Bearing Carbonates at High Pressure Conditions

by Jun Tsuchiya 1,2,*,†, Risa Nishida 1,† and Taku Tsuchiya 1,2,†
1
Geodynamics Research Center (GRC), Ehime University, Ehime 790-8577, Japan
2
Earth-Life Science Institute (ELSI), Tokyo Institute of Technology, Tokyo 152-8550, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Minerals 2020, 10(1), 54; https://doi.org/10.3390/min10010054
Received: 16 October 2019 / Revised: 1 January 2020 / Accepted: 2 January 2020 / Published: 8 January 2020
(This article belongs to the Special Issue Mineral Physics—In Memory of Orson Anderson)
Carbonate minerals such as ferromagnesite (Mg,Fe)CO 3 are suggested to be a possible major deep-carbon host in the lower mantle, because ferromagnesite is possibly stabilized by Fe spin crossover under pressure. However, the behavior of Fe-bearing carbonates under lower mantle pressure conditions has not been suitably examined thus far. Thus, in this study, we investigate the high-pressure stability of ferromagnesite and possible high-pressure structures with the chemical composition of (Mg 0.833 Fe 0.167 )CO 3 via first principles calculation using internally consistent local density approximation with Hubbard parameter (LDA+U) method, which can more accurately account for the electronic state of Fe than the LDA and generalized gradient approximation (GGA) approaches. The enthalpy values obtained via our calculations suggest that (Mg 0.833 Fe 0.167 )CO 3 undergoes phase transition from the R 3 ¯ c structure (high spin) to the P 1 ¯ (high spin) at 50 GPa, and to C2/m (high-spin) structure above 80 GPa, under static 0 K conditions. Therefore, no spin transitions in these carbonate minerals is expected under the lower mantle pressure conditions. View Full-Text
Keywords: carbonate mineral; high pressure; first principles calculation carbonate mineral; high pressure; first principles calculation
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Tsuchiya, J.; Nishida, R.; Tsuchiya, T. First Principles Calculation of the Stability of Iron Bearing Carbonates at High Pressure Conditions. Minerals 2020, 10, 54.

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