Enhanced densification under shock compression in porous silicon

Lane, J. Matthew; Thompson, Aidan Patrick; Vogler, Tracy

doi:10.1103/PhysRevB.90.134311

Title: Enhanced densification under shock compression in porous silicon

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.134311· OSTI ID:1182965

Lane, J. Matthew ^[1]; Thompson, Aidan Patrick ^[1]; Vogler, Tracy ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Under shock compression, most porous materials exhibit lower densities for a given pressure than that of a full-dense sample of the same material. However, some porous materials exhibit an anomalous, or enhanced, densification under shock compression. The mechanism driving this behavior was not completely determined. We present evidence from atomistic simulation that pure silicon belongs to this anomalous class of materials and demonstrate the associated mechanisms responsible for the effect in porous silicon. Atomistic response indicates that local shear strain in the neighborhood of collapsing pores catalyzes a local solid-solid phase transformation even when bulk pressures are below the thermodynamic phase transformation pressure. This metastable, local, and partial, solid-solid phase transformation, which accounts for the enhanced densification in silicon, is driven by the local stress state near the void, not equilibrium thermodynamics. This mechanism may also explain the phenomenon in other covalently bonded materials.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1182965

Alternate ID(s):: OSTI ID: 1181313

Report Number(s):: SAND-2014-15876J; PRBMDO; 533326; TRN: US1600353

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 13; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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