Nanopolycrystalline Diamond Sintered from Onion-Like Carbon

Table 1

Grain sizes of OLCs annealed at 900–1400°C.

Annealing temperature (°C)	900	1000	1100	1200	1300	1400
Grain size (nm)	3.4	3.8	4.0	4.2	4.6	6.4