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Fe 3 C carbide was treated at a high temperature of 1630K and a high pressure of 5.3GPa (HPHT) in a cubic anvil apparatus. Diamond is found to form from iron carbide at high temperature-high pressure (HPHT). The formation of the diamond can be confirmed by laser Raman spectra. This work opens a new way to synthesize diamond at HPHT and provides direct evidence about the diamond formation mechanism...
Transmission electron microscopy (TEM) has been used to study inclusions and defects in a synthetic diamond single crystal grown from Fe-Ni-C system under high temperature-high pressure. The (FeNi) 23 C 6 and SiC inclusions trapped in the diamond were identified. The stacking fault, twin and prismatic dislocation in the diamond were directly observed. The formation mechanisms...
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