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The phase diagram of cobalt at high pressure and temperature: the stability of -cobalt and new -cobalt

1998; IOP Publishing; Volume: 10; Issue: 20 Linguagem: Inglês

10.1088/0953-8984/10/20/001

1361-648X

Choong‐Shik Yoo, Per Söderlind, Hyunchae Cynn,

Metallurgical and Alloy Processes

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.