Abstract：The synthesis of diamond single crystal in the Fe$_{64}$Ni$_{36}$-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300–1400$^{\circ}\!$C. The color of the obtained diamond crystals translates from yellow to dark green with increasing the h-BN addition. Fourier-transform infrared (FTIR) results indicate that $sp^{2}$ hybridization B-N-B and B-N structures generate when the additive content reaches a certain value in the system. The two peaks are located at 745 and 1425 cm$^{-1}$, respectively. Furthermore, the FTIR characteristic peak resulting from nitrogen pairs is noticed and it tends to vanish when the h-BN addition reaches 1.1 wt%. Furthermore, Raman peak of the synthesized diamond shifts down to a lower wavenumber with increasing the h-BN addition content in the synthesis system.
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2016, Vol. 33 
