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Title: Phase transformation as the single-mode mechanical deformation of silicon

The metastable body-centered cubic (bc8) and rhombohedral (r8) phases of silicon that are formed after the nanoindentation of diamond cubic silicon exhibit properties that are of both scientific and technological interest. This letter demonstrates that large regions of these phases can be readily formed from crystalline silicon via nanoindentation with minimal damage to the surrounding crystal. Cross-sectional transmission electron microscopy is used to show that volumes of these phases 6 μm wide and up to 650 nm deep can be generated using a symmetrical spherical tip of ∼21.5 μm diameter. This result indicates that the use of large symmetrical spherical tips result in highly hydrostatic conditions that can favor the single phase transformation mode without extensive damage to the surrounding crystalline regions that are observed in previous studies.
Authors:
; ;  [1] ;  [2]
  1. Department of Electronic Materials Engineering, Research School of Physics and Engineering, Australian National University, Canberra 0200 (Australia)
  2. Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37781 (United States)
Publication Date:
OSTI Identifier:
22482013
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 25; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BCC LATTICES; CRYSTALS; DAMAGE; DEFORMATION; DIAMONDS; PHASE TRANSFORMATIONS; SILICON; SPHERICAL CONFIGURATION; TRANSMISSION ELECTRON MICROSCOPY; TRIGONAL LATTICES