Fig. 3

Powder XRD profiles of the DP 0–0.05 fraction of polycrystalline diamond particles (black curve) and D19 nanodiamonds obtained by sintering (green curve). Insets: Fitting of the most intense reflection from planes (111) with two (red and green) Lorentzian curves centred at 41.5° (D^H 011) and 43.8^o (D^c 111) for samples before (left inset) and after sintering (right inset)