Abstract
Attempts have been made to synthesize nano-polycrystalline diamond (NPD) from graphite at pressures of 12, 13 and 14 GPa at temperatures 2200-2600°C using multi-anvil apparatus. The lower temperature limit for NPD formation increased with decreasing pressure, and we found that pure NPD can be synthesized even at the lowest pressure of 12 GPa, although quite high temperatures of exceeding 2600°C are required. This result demonstrates that NPD can be formed at significantly lower pressures than ever synthesized, which should provide an important constraint in synthesizing larger NPD samples under limited press loads.
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