High-density amorphous phase of silicon carbide obtained under large plastic shear and high pressure

Date
2012-02-28
Authors
Levitas, Valery
Ma, Yanzhang
Levitas, Valery
Selvi, Emre
Wu, Jianzhe
Patten, John
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Aerospace Engineering
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Aerospace Engineering
Abstract

In situ x-ray diffraction study of the hexagonal 6H SiC under pressure and shear in rotational diamond anvil cell is performed that reveals phase transformation to the new high-density amorphous (hda) phase SiC. In contrast to known low-density amorphous SiC, hda-SiC is promoted by pressure and unstable under pressure release. The critical combination of pressure ∼30 GPa and rotation of an anvil of 2160° that causes disordering is determined.

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This article is from Physical Review B 85 (2012): 054114, doi:10.1103/PhysRevB.85.054114. Posted with permission.

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