Journal
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
Volume 185, Issue 1-2, Pages 13-19Publisher
ELSEVIER
DOI: 10.1016/j.pepi.2010.12.001
Keywords
Iron-bearing minerals; Lower mantle; First-principles; Hubbard U; LDA plus U; GGA plus U
Categories
Funding
- National Science Foundation [DMR-0212302, DMR-0819885]
- NSF [ATM-0426757, EAR-0815446]
- Directorate For Geosciences
- Division Of Earth Sciences [1019853] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [0810272] Funding Source: National Science Foundation
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Using iron-bearing magnesium silicate perovskite as an example, we show that the Hubbard U correction is not always necessary for calculating the structural and elastic properties of iron-bearing minerals. Instead, it is the choice of OFT functionals (LDA or GGA) that may have greater impact on the quality of the predictive calculation. For iron-bearing minerals, calculations adopting LDA (LDA + U) are generally in better agreement with experimental data than those adopting GGA (GGA + U) after including zero point motion and thermal vibrational effects, as demonstrated by the room-temperature compression curve of (Mg,Fe)SiO3 perovskite. A criterion indicating the necessity of the Hubbard U correction is also discussed. As long as the standard OFT functional produces insulating ground state with correct orbital occupancy, the Hubbard U correction does not affect the computed structural and elastic properties. (C) 2010 Elsevier B.V. All rights reserved.
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