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The structure of iron under the conditions of the Earth's inner core

Vocadlo, L; Brodholt, J; Alfe, D; Price, GD; Gillan, MJ; (1999) The structure of iron under the conditions of the Earth's inner core. Geophysical Research Letters , 26 (9) 1231 - 1234. 10.1029/1999GL900214. Green open access

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Abstract

The inferred density of the solid inner core indicates that it is predominantly made of iron. In order to indicates that it is predominantly made of iron. In order to interpret the observed seismic anisotropy and understand the high pressure and temperature behaviour of the core, it is essential to establish the crystal structure of iron under core conditions. On the basis of extrapolated experimental data, a number of candidate structures for the high PIT iron phase have been proposed, namely, body-centred cubic (bcc), body-centred tetragonal (bct), hexagonal close-packed (hcp), double-hexagonal close-packed (dhcp) and an orthorhombically distorted hcp polymorph (Matsui, 1993; Stixrude and Cohen, 1995; Boehler, 1993; Saxena et al., 1996; Andrault et al., 1997). Here we present the results of the first fully ab initio free energy calculations for all of these polymorphs of iron at core pressures and temperatures. Our results show that hcp-Fe is the most stable polymorph of iron under the conditions of the Earth's inner core.

Type: Article
Title: The structure of iron under the conditions of the Earth's inner core
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/1999GL900214
Publisher version: http://dx.doi.org/10.1029/1999GL900214
Language: English
Additional information: Copyright 1999 by the American Geophysical Union
Keywords: High-pressure, Ultrasoft pseudopotentials, Energy Calculations, Phase-transitions, High-temperature, Bcc, Fe
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > VP: Research
URI: https://discovery.ucl.ac.uk/id/eprint/99175
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