Journal
PHYSICAL REVIEW B
Volume 89, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.144111
Keywords
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Funding
- EFree, an Energy Frontier Research Center-U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001057]
- NSF [DMR-IO-1006184]
- theory program at the Lawrence Berkeley National Laboratory through the Office of Basic Energy Science, U.S. Department of Energy [DE-AC02-05CH11231]
- ARC QEII fellowship
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER45775, DE-AC02-06CH11357]
- NSF
- COMPRES under NSF Cooperative Agreement [EAR 11-57758]
- GSECARS through NSF [EAR-1128799]
- DOE [DE-FG02- 94ER14466]
- Australian Research Council (ARC)
- Direct For Mathematical & Physical Scien [1006184] Funding Source: National Science Foundation
- Division Of Materials Research [1006184] Funding Source: National Science Foundation
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The nucleation of metastable germanium polymorphs on decompression is studied using in situ synchrotron x-ray diffraction. We show that the transition pathway is critically dependent on the hydrostaticity. Quasihydrostatic conditions result in the nucleation of the rhombohedral r8 phase, followed by the cubic bc8 and hexagonal diamond phases. In contrast, the presence of shear yields the tetragonal st12 phase. Thus, targeted nucleation of a metastable polymorph is now possible. This observation has implications for the technological exploitation of Ge, but also for other tetrahedral systems.
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