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Spectroscopic study of impurities and associated defects in nanodiamonds from Efremovka (CV3) and Orgueil (CI) meteorites |
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| Authors: | AA Shiryaev AV Fisenko P Nagel |
| Institution: | a Institute of Physical Chemistry and Electrochemistry RAS, Leninsky pr. 31, Moscow 119991, Russia b Vernadsky Institute of Geochemistry and Analytical Chemistry RAS, Kosygina Str. 19, Moscow, Russia c General Physics Institute RAS, Vavilov Str. 38, 119991 Moscow, Russia d Karlsruhe Institute of Technology, Institute für Festkörperphysik, Karlsruhe 76133, Germany |
| Abstract: | The results of spectroscopic and structural studies of phase composition and defects in nanodiamonds from Efremovka (CV3) and Orgueil (CI) chondrites indicate that nitrogen atomic environment in meteoritic nanodiamonds (MND) is similar to that observed in synthetic counterparts produced by detonation and by the Chemical Vapor Deposition (CVD)-process. Most of the nitrogen in MND appears to be confined to lattice imperfections, such as crystallite/twin boundaries and other extended defects, while the concentration of nitrogen in the MND lattice is low. It is suggested that the N-rich sub-population of MND grains may have been formed with high growth rates in environments rich in accessible N (i.e., N in atomic form or as weakly bonded compounds). For the first time the silicon-vacancy complex (the “silicon” defect) is observed in MND by photoluminescence spectroscopy. |
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