Subnanosecond phase transition dynamics in laser-shocked iron

被引：44

作者：

Hwang, H. ^{[1
]}

Galtier, E. ^{[2
]}

Cynn, H. ^{[3
]}

Eom, I ^{[4
]}

Chun, S. H. ^{[4
]}

Bang, Y. ^{[1
]}

Hwang, G. C. ^{[1
]}

Choi, J. ^{[1
]}

Kim, T. ^{[1
]}

Kong, M. ^{[1
]}

Kwon, S. ^{[1
]}

Kang, K. ^{[1
]}

Lee, H. J. ^{[2
]}

Park, C. ^{[5
]}

Lee, J., I ^{[5
]}

Lee, Yongmoon ^{[6
]}

Yang, W. ^{[6
]}

Shim, S-H ^{[7
]}

Vogt, T. ^{[8
,9
]}

Kim, Sangsoo ^{[4
]}

Park, J. ^{[4
]}

Kim, Sunam ^{[4
]}

Nam, D. ^{[4
]}

Lee, J. H. ^{[4
]}

Hyun, H. ^{[4
]}

Kim, M. ^{[4
]}

Koo, T-Y ^{[4
]}

Kao, C-C ^{[2
]}

Sekine, T. ^{[6
,10
]}

Lee, Yongjae ^{[1
,6
]}

机构：

[1] Yonsei Univ, Dept Earth Syst Sci, Seoul 03722, South Korea

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

[3] Lawrence Livermore Natl Lab, High Pressure Phys Grp, Livermore, CA 94550 USA

[4] Pohang Accelerator Lab, Pohang 37673, Gyeongbuk, South Korea

[5] Korea Polar Res Inst, Incheon 21990, South Korea

[6] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

[7] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[8] Univ South Carolina, NanoCtr, Columbia, SC 29208 USA

[9] Univ South Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA

[10] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

来源：

SCIENCE ADVANCES | 2020年 / 6卷 / 23期

关键词：

X-RAY-DIFFRACTION; FREE-ELECTRON LASER; HIGH-PRESSURE; CHEMICAL-REACTIONS; WAVE; TRANSFORMATION; COMPRESSION; STATE;

D O I：

10.1126/sciadv.aaz5132

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：

Iron is one of the most studied chemical elements due to its sociotechnological and planetary importance; hence, understanding its structural transition dynamics is of vital interest. By combining a short pulse optical laser and an ultrashort free electron laser pulse, we have observed the subnanosecond structural dynamics of iron from high-quality x-ray diffraction data measured at 50-ps intervals up to 2500 ps. We unequivocally identify a three-wave structure during the initial compression and a two-wave structure during the decaying shock, involving all of the known structural types of iron (alpha-, gamma-, and epsilon-phase). In the final stage, negative lattice pressures are generated by the propagation of rarefaction waves, leading to the formation of expanded phases and the recovery of gamma-phase. Our observations demonstrate the unique capability of measuring the atomistic evolution during the entire lattice compression and release processes at unprecedented time and strain rate.

引用

页数：8

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