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Constraints on the crystalline structure of the inner core: Mechanical instability of BCC iron at high pressure

Stixrude, L; Cohen, RE; (1995) Constraints on the crystalline structure of the inner core: Mechanical instability of BCC iron at high pressure. Geophysical Research Letters , 22 (2) 125 - 128. 10.1029/94GL02742. Green open access

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Abstract

We examine the energetics of close-packed phases of iron (bcc, fee, hcp) throughout the pressure regime of the earth with elaborate first principles electronic structure calculations. The calculations reproduce the relevant experimental observations including the equation of state to over 300 GPa and the pressure of the bcc to hcp phase transition. The bcc structure is found to be energetically unfavorable and mechanically unstable with respect to a tetragonal strain at high pressure (P>150 GPa). This phase is thus highly unlikely to exist in the earth's inner core as has frequently been proposed.

Type: Article
Title: Constraints on the crystalline structure of the inner core: Mechanical instability of BCC iron at high pressure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/94GL02742
Publisher version: http://dx.doi.org/10.1029/94GL02742
Language: English
Additional information: Copyright 1994 by the American Geophysical Union
Keywords: Earths core, Free oscillations, Anisotropy, Phase, Temperatures
UCL classification: UCL > Provost and Vice Provost Offices
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
URI: http://discovery.ucl.ac.uk/id/eprint/135995
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