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Equation of state and high-pressure/high-temperature phase diagram of magnesium

DOI: 10.1103/PhysRevB.90.134105 DOI Help

Authors: Graham Stinton (University of Edinburgh, U.K.) , Simon Macleod (Atomic Weapons Establishment; Imperial College London; Research Complex at Harwell) , H. Cynn (Lawrence Livermore National Laboratory, USA.) , Daniel Errandonea (Universidad de Valencia, Spain) , W. J. Evans (Lawrence Livermore National Laboratory, USA.) , John Proctor (University of Salford, U.K.) , Y Meng (Carnegie Institution of Washington, USA.) , Malcolm Mcmahon (University of Edinburgh, U.K.)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Physical Review B , VOL 90 (13)

State: Published (Approved)
Published: October 2014
Diamond Proposal Number(s): 4215

Abstract: The phase diagram of magnesium has been investigated to 211 GPa at 300 K, and to 105 GPa at 4500 K, by using a combination of x-ray diffraction and resistive and laser heating. The ambient pressure hcp structure is found to start transforming to the bcc structure at about 45 GPa, with a large region of phase-coexistence that becomes smaller at higher temperatures. The bcc phase is stable to the highest pressures reached. The hcp-bcc phase boundary has been studied on both compression and decompression, and its slope is found to be negative and steeper than calculations have previously predicted. The laser-heating studies extend the melting curve of magnesium to 105 GPa and suggest that, at the highest pressures, the melting temperature increases more rapidly with pressure than previously reported. Finally, we observe some evidence of a new phase in the region of 10 GPa and 1200 K, where previous studies have reported a double-hexagonal-close-packed (dhcp) phase. However, the additional diffraction peaks we observe cannot be accounted for by the dhcp phase alone.

Subject Areas: Physics, Materials, Chemistry

Instruments: I15-Extreme Conditions

Other Facilities: Advanced Photon Source

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