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Gao, Yang; Ma, Yanzhang; An, Qi; Levitas, Valery; Zhang, Yanyan; Feng, Biao; Chaudhuri, Jharna; Goddard, William A.
Carbon (New York), 20/May , Volume: 146Journal Article
The transformation pathways of carbon at high pressures are of broad interest for synthesis of novel materials and for revealing the Earth's geological history. We have applied large plastic shear on graphite in a rotational anvil cell to form hexagonal diamond and nanocrystalline cubic diamond at extremely low pressures of 0.4 and 0.7 GPa, which are 50 and 100 times lower than the transformation pressures under hydrostatic compression and well below the phase equilibrium. Large shearing accompanied with pressure elevation to 3 GPa also leads to formation of a new orthorhombic diamond phase. Our results demonstrate new mechanisms and new means for plastic shear-controlled material synthesis at drastically reduced pressures, enabling new technologies for material synthesis. The result also has significant geological implications. Display omitted
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