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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4923205· OSTI ID:1190758
 [1];  [2];  [1];  [1]
  1. Australian National Univ., Canberra (Australia)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The mixture of the metastable body-centered cubic (bc8) and rhombohedral (r8) phases of silicon that is formed via nanoindentation of diamond cubic (dc) silicon exhibits properties that are of scientifc and technological interest. This letter demonstrates that large regions of this mixed phase can be formed in crystalline Si via nanoindentation without signifcant damage to the surrounding crystal. Cross-sectional transmission electron microscopy is used to show that volumes 6 μm wide and up to 650 nm deep can be generated in this way using a spherical tip of ~21.5 μm diameter. The phase transformed region is characterised using both Raman microspectroscopy and transmission electron microscopy. It is found that uniform loading using large spherical indenters can favor phase transformation as the sole deformation mechanism as long as the maximum load is below a critical level. We suggest that the sluggish nature of the transformation from the dc-Si phase to the metallic (b-Sn) phase normally results in competing deformation mechanisms such as slip and cracking but these can be suppressed by controlled loading conditions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1190758
Alternate ID(s):
OSTI ID: 1226765
Journal Information:
Applied Physics Letters, Vol. 106, Issue 25; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (4)

A novel approach of high-performance grinding using developed diamond wheels journal January 2017
In-situ high temperature micro-Raman investigation of annealing behavior of high-pressure phases of Si journal June 2019
Origin of a Nanoindentation Pop-in Event in Silicon Crystal journal March 2017
Nanoindentation Induced Deformation and Pop-in Events in a Silicon Crystal: Molecular Dynamics Simulation and Experiment journal August 2017

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