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In this paper, large single crystal diamond with perfect shape and high nitrogen concentration approximately 1671–1742 ppm was successfully synthesized by temperature gradient method (TGM) under high pressure and high temperature (HPHT). The HPHT synthesis conditions were about 5.5 GPa and 1500–1550 K. Sodium azide (NaN3) with different amount was added as the source of nitrogen into the synthesis...
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