Abstract
Nitrogen is successfully doped in diamond by adding sodium azide(NaN3) as the source of nitrogen to the graphite and ironpowders. The diamond crystals with high nitrogen concentration,1000–2200 ppm, which contain the same concentrations of nitrogen withnatural diamond, have been synthesized by using the system ofiron-carbon-additive NaN3. The nitrogen concentrations indiamond increase with the increasing content of NaN3. Whenthe content of NaN3 is increased to 0.7–1.3 wt.%, thenitrogen concentration in the diamond almost remains in a nitrogenconcentration range from 1250 ppm to 2200 ppm, which is the highestvalue and several times higher than that in the diamond synthesized bya conventional method without additive NaN3 under highpressure and high temperature (HPHT) conditions.
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