Ultrafast X-Ray Diffraction Studies of the Phase Transitions and Equation of State of Scandium Shock Compressed to 82 GPa

被引：54

作者：

Briggs, R. ^{[1
,2
]}

Gorman, M. G. ^{[1
,2
]}

Coleman, A. L. ^{[1
,2
]}

McWilliams, R. S. ^{[1
,2
]}

McBride, E. E. ^{[3
]}

McGonegle, D. ^{[4
]}

Wark, J. S. ^{[4
]}

Peacock, L. ^{[5
]}

Rothman, S. ^{[5
]}

Macleod, S. G. ^{[5
,6
]}

Bolme, C. A. ^{[7
]}

Gleason, A. E. ^{[7
]}

Collins, G. W. ^{[8
]}

Eggert, J. H. ^{[8
]}

Fratanduono, D. E. ^{[8
]}

Smith, R. F. ^{[8
]}

Galtier, E. ^{[9
]}

Granados, E. ^{[9
]}

Lee, H. J. ^{[9
]}

Nagler, B. ^{[9
]}

Nam, I. ^{[9
]}

Xing, Z. ^{[9
]}

McMahon, M. I. ^{[1
,2
,10
]}

机构：

[1] Univ Edinburgh, SUPA, Sch Phys & Astron, Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] Univ Edinburgh, Ctr Sci Extreme Condit, Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] European XFEL, Albert Einstein Ring 19, D-22761 Hamburg, Germany

[4] Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England

[5] Atom Weap Estab, Reading RG7 4PR, Berks, England

[6] Imperial Coll London, Inst Shock Phys, London SW7 2AZ, England

[7] Los Alamos Natl Lab, Shock & Detonat Phys, POB 1663, Los Alamos, NM 87545 USA

[8] Lawrence Livermore Natl Lab, 6000 East Ave, Livermore, CA 94500 USA

[9] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

[10] Res Complex Harwell, Didcot OX11 0FA, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

HIGH-PRESSURE; METALS; MATTER; IRON;

D O I：

10.1103/PhysRevLett.118.025501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using x-ray diffraction at the Linac Coherent Light Source x-ray free-electron laser, we have determined simultaneously and self-consistently the phase transitions and equation of state (EOS) of the lightest transition metal, scandium, under shock compression. On compression scandium undergoes a structural phase transition between 32 and 35 GPa to the same bcc structure seen at high temperatures at ambient pressures, and then a further transition at 46 GPa to the incommensurate host-guest polymorph found above 21 GPa in static compression at room temperature. Shock melting of the host-guest phase is observed between 53 and 72 GPa with the disappearance of Bragg scattering and the growth of a broad asymmetric diffraction peak from the high-density liquid.

引用

页数：6

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