The phase diagram of cobalt at high pressure and temperature: the stability of -cobalt and new -cobalt
- 25 May 1998
- journal article
- letter
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 10 (20) , L311-L318
- https://doi.org/10.1088/0953-8984/10/20/001
Abstract
A metastable dhcp phase of cobalt, , has been discovered below 60 GPa by using in situ x-ray diffraction and a laser-heated diamond-anvil cell. The volume at 34 GPa is with = 3.190. First-principles theory shows that and are close in energy below 60 GPa, and that temperature and magnetic effects can make dhcp-Co more stable than hcp-Co. The -phase is found to be stable and quenchable over a wide range of pressure and temperature. New constraints for the phase diagram of Co are presented.Keywords
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