Evidence for Crystalline Structure in Dynamically-Compressed Polyethylene up to 200 GPa

被引：27

作者：

Hartley, N. J. ^{[1
,2
]}

Brown, S. ^{[3
]}

Cowan, T. E. ^{[1
,4
]}

Cunningham, E. ^{[3
]}

Doppner, T. ^{[5
]}

Falcone, R. W. ^{[6
]}

Fletcher, L. B. ^{[3
]}

Frydrych, S. ^{[5
,7
]}

Galtier, E. ^{[3
]}

Gamboa, E. J. ^{[3
]}

Garcia, A. Laso ^{[1
]}

Gericke, D. O. ^{[8
]}

Glenzer, S. H. ^{[3
]}

Granados, E. ^{[3
]}

Heimann, P. A. ^{[3
]}

Lee, H. J. ^{[3
]}

MacDonald, M. J. ^{[6
]}

MacKinnon, A. J. ^{[3
,5
]}

McBride, E. E. ^{[3
,9
]}

Nam, I. ^{[3
]}

Neumayer, P. ^{[10
]}

Pak, A. ^{[5
]}

Pelka, A. ^{[1
]}

Prencipe, I. ^{[1
]}

Ravasio, A. ^{[11
]}

Roedel, M. ^{[1
,4
]}

Rohatsch, K. ^{[1
,4
]}

Saunders, A. M. ^{[6
]}

Schoelmerich, M. ^{[9
]}

Schoerner, M. ^{[3
,12
]}

Schuster, A. K. ^{[1
]}

Sun, P. ^{[3
]}

van Driel, T. ^{[3
]}

Vorberger, J. ^{[1
]}

Kraus, D. ^{[4
]}

机构：

[1] Helmholtz Zentrum Dresden Rossendorf, D-01328 Dresden, Germany

[2] Osaka Univ, Open & Transdisciplinary Res Inst, Suita, Osaka 5650871, Japan

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94309 USA

[4] Tech Univ Dresden, D-01062 Dresden, Germany

[5] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[7] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[8] Univ Warwick, Dept Phys, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

[9] European XFEL GmbH, D-22869 Schenefeld, Germany

[10] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[11] Univ Paris VI, Ecole Polytech, LULI, CNRS,CEA, F-91128 Palaiseau, France

[12] Univ Rostock, Inst Phys, D-18051 Rostock, Germany

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

关键词：

UNIVERSAL EQUATION; URANUS; INTERIOR; DIAMONDS; NEPTUNE; MODELS; STATE;

D O I：

10.1038/s41598-019-40782-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We investigated the high-pressure behavior of polyethylene (CH2) by probing dynamically-compressed samples with X-ray diffraction. At pressures up to 200 GPa, comparable to those present inside icy giant planets (Uranus, Neptune), shock-compressed polyethylene retains a polymer crystal structure, from which we infer the presence of significant covalent bonding. The A2/m structure which we observe has previously been seen at significantly lower pressures, and the equation of state measured agrees with our findings. This result appears to contrast with recent data from shock-compressed polystyrene (CH) at higher temperatures, which demonstrated demixing and recrystallization into a diamond lattice, implying the breaking of the original chemical bonds. As such chemical processes have significant implications for the structure and energy transfer within ice giants, our results highlight the need for a deeper understanding of the chemistry of high pressure hydrocarbons, and the importance of better constraining planetary temperature profiles.

引用

页数：7

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