Enhanced densification under shock compression in porous silicon
Abstract
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.
- Authors:
-
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1182965
- Alternate Identifier(s):
- OSTI ID: 1181313
- Report Number(s):
- SAND-2014-15876J
Journal ID: ISSN 1098-0121; PRBMDO; 533326; TRN: US1600353
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 13; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Lane, J. Matthew, Thompson, Aidan Patrick, and Vogler, Tracy. Enhanced densification under shock compression in porous silicon. United States: N. p., 2014.
Web. doi:10.1103/PhysRevB.90.134311.
Lane, J. Matthew, Thompson, Aidan Patrick, & Vogler, Tracy. Enhanced densification under shock compression in porous silicon. United States. https://doi.org/10.1103/PhysRevB.90.134311
Lane, J. Matthew, Thompson, Aidan Patrick, and Vogler, Tracy. Mon .
"Enhanced densification under shock compression in porous silicon". United States. https://doi.org/10.1103/PhysRevB.90.134311. https://www.osti.gov/servlets/purl/1182965.
@article{osti_1182965,
title = {Enhanced densification under shock compression in porous silicon},
author = {Lane, J. Matthew and Thompson, Aidan Patrick and Vogler, Tracy},
abstractNote = {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.},
doi = {10.1103/PhysRevB.90.134311},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 13,
volume = 90,
place = {United States},
year = {Mon Oct 27 00:00:00 EDT 2014},
month = {Mon Oct 27 00:00:00 EDT 2014}
}
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