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Thermal evolution of the metastable r8 and bc8 polymorphs of silicon

Journal Article · · High Pressure Research
 [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.

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source; Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725; SC0001057
OSTI ID:
1286830
Alternate ID(s):
OSTI ID: 1210776
OSTI ID: 1178822
Journal Information:
High Pressure Research, Journal Name: High Pressure Research Journal Issue: 2 Vol. 35; ISSN 0895-7959
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Developments in time-resolved high pressure x-ray diffraction using rapid compression and decompression journal July 2015
In-situ high temperature micro-Raman investigation of annealing behavior of high-pressure phases of Si journal June 2019
Thermal evolution of the indentation-induced phases of silicon journal September 2019
Shear-driven phase transformation in silicon nanowires journal February 2018
High-pressure studies with x-rays using diamond anvil cells journal November 2016

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