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.
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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 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 |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/135995 |
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