Generating gradient germanium nanostructures by shock-induced amorphization and crystallization

Zhao, Shiteng; Kad, Bimal; Wehrenberg, Christopher E.; Remington, Bruce A.; Hahn, Eric N.; More, Karren L.; Meyers, Marc A.

doi:10.1073/pnas.1708853114

Title: Generating gradient germanium nanostructures by shock-induced amorphization and crystallization

Journal Article · Mon Aug 28 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1708853114· OSTI ID:1377093

Zhao, Shiteng; Kad, Bimal; Wehrenberg, Christopher E.; Remington, Bruce A.; Hahn, Eric N.; More, Karren L.; Meyers, Marc A.

Gradient nanostructures are attracting considerable interest due to their potential to obtain superior structural and functional properties of materials. Applying powerful laser-driven shocks (stresses of up to one-third million atmospheres, or 33 gigapascals) to germanium, we report here a complex gradient nanostructure consisting of, near the surface, nanocrystals with high density of nanotwins. Beyond there, the structure exhibits arrays of amorphous bands which are preceded by planar defects such as stacking faults generated by partial dislocations. At a lower shock stress, the surface region of the recovered target is completely amorphous. We propose that germanium undergoes amorphization above a threshold stress and that the deformation-generated heat leads to nanocrystallization. These experiments are corroborated by molecular dynamics simulations which show that supersonic partial dislocation bursts play a role in triggering the crystalline-to-amorphous transition.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Contributing Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Grant/Contract Number:: AC05-00OR22725; 09-LR-06-118456-MEYM; NA0002930; LFR-17-449059; AC52-07NA27344; NA0002080

OSTI ID:: 1377093

Alternate ID(s):: OSTI ID: 1414697; OSTI ID: 1462273; OSTI ID: 1476238

Report Number(s):: DE-UCSD-NA0002080; LLNL-JRNL-741090

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 114 Journal Issue: 37; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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36 MATERIALS SCIENCE
amorphization
laser shock
nanocrystallization
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Title: Generating gradient germanium nanostructures by shock-induced amorphization and crystallization

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