The shear-driven transformation mechanism from glassy carbon to hexagonal diamond
Hexagonal diamond, a potentially superhard material, forms from a glassy carbon precursor at pressuresof ~100 GPa at the relatively low temperature of 400 C. The formation mechanism of the hexagonaldiamond phase was investigated by performing microstructural analysis on cross-sections of therecovered samples. Three distinct structures have been observed, a graphitic region near the centre of thesample with low density, a hexagonal diamond region at the edge of the sample with high density, and...[Show more]
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