Phase-transition plasticity response in uniaxially compressed silicon nanospheres

P. Valentini, W. W. Gerberich, Traian Dumitrica

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

We present a microscopic description for the response of crystalline Si nanospheres up to 10 nm in radius for various uniaxial compression levels. The behavior at low compressions closely resembles the Hertzian predictions. At higher compressions the creation of a new β-tin phase in the particle core leads to (i) volumetric changes (ii) an increase in elastic moduli, and (iii) significant hardening. Further, (iv) a reversible character of the transformation is obtained with molecular dynamics simulations. The agreement of (i)-(iv) with recent experimental findings challenges the current exclusive view of a dislocation plasticity response in somewhat larger nanoparticles. The phase-transition path should dominate in ultrasmall structures, where dislocation activity is prohibited.

Original languageEnglish (US)
Article number175701
JournalPhysical Review Letters
Volume99
Issue number17
DOIs
StatePublished - Oct 26 2007

Fingerprint Dive into the research topics of 'Phase-transition plasticity response in uniaxially compressed silicon nanospheres'. Together they form a unique fingerprint.

Cite this