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Title: Thermal evolution of the metastable r8 and bc8 polymorphs of silicon

Abstract

The kinetics of two metastable polymorphs of silicon under thermal annealing was investigated. These phases with body-centered cubic bc8 and rhombohedral r8 structures can be formed upon pressure release from metallic silicon.We study these metastable polymorphs were formed by two different methods, via point loading and in a diamond anvil cell (DAC). Upon thermal annealing different transition pathways were detected. In the point loading case, the previously reported Si-XIII formed and was confirmed as a new phase with an as-yet-unidentified structure. In the DAC case, bc8-Si transformed to the hexagonal-diamond structure at elevated pressure, consistent with previous studies at ambient pressure. In contrast, r8-Si transformed directly to diamond-cubic Si at a temperature of 255⁰C. In conclusion, these data were used to construct diagrams of the metastability regimes of the polymorphs formed in a DAC and may prove useful for potential technological applications of these metastable polymorphs.

Authors:
 [1];  [2];  [3];  [3];  [1];  [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. Carnegie Inst. of Science, Washington, DC (United States)
  3. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1286830
Grant/Contract Number:  
AC05-00OR22725; SC0001057
Resource Type:
Accepted Manuscript
Journal Name:
High Pressure Research
Additional Journal Information:
Journal Volume: 35; Journal Issue: 2; Journal ID: ISSN 0895-7959
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; pressure-induced transitions; metastable polymorphs; silicon; in situ annealing

Citation Formats

Haberl, Bianca, Guthrie, Malcolm, Sinogeikin, Stanislav V., Shen, Guoyin, Williams, James S., and Bradby, Jodie E. Thermal evolution of the metastable r8 and bc8 polymorphs of silicon. United States: N. p., 2015. Web. doi:10.1080/08957959.2014.1003555.
Haberl, Bianca, Guthrie, Malcolm, Sinogeikin, Stanislav V., Shen, Guoyin, Williams, James S., & Bradby, Jodie E. Thermal evolution of the metastable r8 and bc8 polymorphs of silicon. United States. https://doi.org/10.1080/08957959.2014.1003555
Haberl, Bianca, Guthrie, Malcolm, Sinogeikin, Stanislav V., Shen, Guoyin, Williams, James S., and Bradby, Jodie E. Wed . "Thermal evolution of the metastable r8 and bc8 polymorphs of silicon". United States. https://doi.org/10.1080/08957959.2014.1003555. https://www.osti.gov/servlets/purl/1286830.
@article{osti_1286830,
title = {Thermal evolution of the metastable r8 and bc8 polymorphs of silicon},
author = {Haberl, Bianca and Guthrie, Malcolm and Sinogeikin, Stanislav V. and Shen, Guoyin and Williams, James S. and Bradby, Jodie E.},
abstractNote = {The kinetics of two metastable polymorphs of silicon under thermal annealing was investigated. These phases with body-centered cubic bc8 and rhombohedral r8 structures can be formed upon pressure release from metallic silicon.We study these metastable polymorphs were formed by two different methods, via point loading and in a diamond anvil cell (DAC). Upon thermal annealing different transition pathways were detected. In the point loading case, the previously reported Si-XIII formed and was confirmed as a new phase with an as-yet-unidentified structure. In the DAC case, bc8-Si transformed to the hexagonal-diamond structure at elevated pressure, consistent with previous studies at ambient pressure. In contrast, r8-Si transformed directly to diamond-cubic Si at a temperature of 255⁰C. In conclusion, these data were used to construct diagrams of the metastability regimes of the polymorphs formed in a DAC and may prove useful for potential technological applications of these metastable polymorphs.},
doi = {10.1080/08957959.2014.1003555},
journal = {High Pressure Research},
number = 2,
volume = 35,
place = {United States},
year = {Wed Jan 28 00:00:00 EST 2015},
month = {Wed Jan 28 00:00:00 EST 2015}
}

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