High pressure and high temperature treatment of chemical vapor deposited polycrystalline diamond: From opaque to transparent

Spectroscopic characterization of yellow gem quality CVD diamond

“…3a). Some of these lines are also observed in spectra of natural diamonds [19]. The 1353, 1362, 1371 and 1454 cm -1 lines reduce their intensity and may eventually disappear after LPHT annealing (Fig.…”

“…Intensities of the 1295 cm -1 band and 1341 cm -1 line correlate. These features are not detected in as-grown samples [19]. Heating at a temperature as low as 1200⁰C may generate both centers.…”