Detonation-induced transformation of graphite to hexagonal diamond

被引：13

作者：

Stavrou, Elissaios ^{[1
]}

Bagge-Hansen, Michael ^{[1
]}

Hammons, Joshua A. ^{[1
]}

Nielsen, Michael H. ^{[1
]}

Steele, Bradley A. ^{[1
]}

Xiao, Penghao ^{[1
]}

Kroonblawd, Matthew P. ^{[1
]}

Nelms, Matthew D. ^{[1
]}

Shaw, William L. ^{[1
]}

Bassett, Will ^{[1
]}

Bastea, Sorin ^{[1
]}

Lauderbach, Lisa M. ^{[1
]}

Hodgin, Ralph L. ^{[1
]}

Perez-Marty, Nicholas A. ^{[1
]}

Singh, Saransh ^{[1
]}

Das, Pinaki ^{[2
]}

Li, Yuelin ^{[2
,3
]}

Schuman, Adam ^{[2
]}

Sinclair, Nicholas ^{[2
]}

Fezzaa, Kamel ^{[3
]}

Deriy, Alex ^{[3
]}

Leininger, Lara D. ^{[1
]}

Willey, Trevor M. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA

[2] Washington State Univ, Inst Shock Phys, Dynam Compress Sect DCS, Argonne, IL 60439 USA

[3] Argonne Natl Lab, Adv Photon Source, 9700 South Cass Ave, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 10期

关键词：

CRYSTAL; EVOLUTION; PROGRAM;

D O I：

10.1103/PhysRevB.102.104116

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We explore the structural evolution of highly oriented pyrolytic graphite (HOPG) under detonation-induced shock conditions using in situ synchrotron x-ray diffraction in the ns timescale. We observe the formation of hexagonal diamond (lonsdaleite) at pressures above 50 GPa, in qualitative agreement with recent gas gun experiments. First-principles density functional calculations reveal that under uniaxial compression, the energy barrier for the transition toward hexagonal diamond is lower than that for cubic diamond. Finally, no indication of cubic diamond formation was observed up to > 70 GPa.

引用

页数：7

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