Journal
HIGH PRESSURE RESEARCH
Volume 35, Issue 2, Pages 99-116Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08957959.2014.1003555
Keywords
pressure-induced transitions; silicon; in situ annealing; metastable polymorphs
Categories
Funding
- Australian Research Council (ARC)
- ARC Future Fellowship
- EFree, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001057]
- Alvin M. Weinberg Fellowship (ORNL)
- Spallation Neutron Source (ORNL) - U.S. Department of Energy, Office of Basic Energy Sciences
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER45775, DE-AC02-06CH11357]
- NSF [EAR-1128799]
- DOE [DE-FG02-94ER14466]
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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. In this 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 [GRAPHICS] . 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.
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