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

Valery I. Levitas, Yanzhang Ma, Emre Selvi, Jianzhe Wu, John A. Patten

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65 Scopus citations

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.

Original languageEnglish
Article number054114
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number5
DOIs
StatePublished - Feb 29 2012

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