Abstract
Using three kinds of graphites with different graphitization degrees ascarbon source and Fe–Ni alloy powder as catalyst, the synthesis ofdiamond crystals is performed in a cubic anvil high-pressure andhigh-temperature apparatus (SPD-6×1200). Diamond crystals with perfecthexoctahedron shape are successfully synthesized at pressure from 5.0to 5.5 GPa and at temperature from 1570 to 1770 K. The syntheticconditions, nucleation, morphology, inclusion and granularity ofdiamond crystals are studied. The temperature and pressure increasewith the increase of the graphitization degree of graphite. Thequantity of nucleation and granularity of diamonds decreases with theincrease of graphitization degree of graphite under the same synthesisconditions. Moreover, according to the results of the Mössbauerspectrum, the composition of inclusions is mainly Fe3C and Fe-Nialloy phases in diamond crystals synthesized with three kinds ofgraphites.
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