Spectroscopic study of defects and inclusions in bulk poly- and nanocrystalline diamond aggregates

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Shiryaev, A. A. ; Iakoubovskii, K. ; Grambole, D. ; Dubrovinskaia, Natalia:
Spectroscopic study of defects and inclusions in bulk poly- and nanocrystalline diamond aggregates.
In: Journal of Physics: Condensed Matter. Bd. 18 (2006) Heft 40 . - S. 493-501.
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/18/40/L01

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Abstract

Recently, a novel form of nanodiamond exhibiting unusual mechanical properties has been synthesized by high-pressure high-temperature (HPHT) treatment of C 60 fullerene, amorphous carbon and diamond powder. In this study, we have characterized the dominant defects in this nanodiamond by a combination of optical absorption, luminescence, Raman, electron spin resonance and elastic recoil detection techniques. Unusually high concentrations (~0.4 at.) of hydrogen and very low concentrations of nitrogen (~10 −5 at.) have been detected in diamond grown from C 60 . Although most of hydrogen is shown to originate from inclusions of foreign phases, such as water, significant concentrations (~0.01 at.) of hydrogen were also detected as a point defect in the nanodiamond grains. Observed structural differences between the samples made from various carbonaceous materials are attributed to different behaviour of the starting compounds during HPHT treatment.