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

Stinton, GW; Macleod, SG; Cynn, H; Errandonea, D; Evans, WJ; Proctor, JE; Meng, Y; McMahon, MI

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Authors

GW Stinton

SG Macleod

H Cynn

D Errandonea

WJ Evans

Y Meng

MI McMahon



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 ∼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.

Citation

Stinton, G., Macleod, S., Cynn, H., Errandonea, D., Evans, W., Proctor, J., …McMahon, M. (2014). Equation of state and high-pressure/high-temperature phase diagram of magnesium. Physical review B: Condensed matter and materials physics, 90(13), 134105-134105. https://doi.org/10.1103/PhysRevB.90.134105

Journal Article Type Article
Acceptance Date Oct 20, 2014
Online Publication Date Oct 20, 2014
Publication Date Oct 20, 2014
Deposit Date Dec 8, 2015
Publicly Available Date Apr 5, 2016
Journal Physical Review B (PRB)
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Volume 90
Issue 13
Pages 134105-134105
DOI https://doi.org/10.1103/PhysRevB.90.134105
Publisher URL http://dx.doi.org/10.1103/PhysRevB.90.134105
Related Public URLs http://journals.aps.org/prb/

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