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The possibility of growing bulk single crystals from detonation nanodiamond (DND) particles by oriented attachment in the presence of alcohols or/and hydrocarbons was predicted and experimentally demonstrated by our group in previous works [1–3]. It is assumed that diamond single crystals of size between 500 nm and 15 mcm are formed directly from 4 – 5 nm sized diamond nanoparticles under conditions of high pressure and high temperature (HPHT)(P ≈ 7 GPa, T ≈ 1300 – 1700 ◦C). One of the most promising applications of synthesized diamond microcrystals is related to the formation of luminescent impurity centers inside diamond lattice from their own system of defects originating during crystal growth. The distinction of composition and structure of lattices defects in sintered microcrystals and initial DND particles was found for the first time by ESR [4, 5]. The goal of present work is studying transformation of composition and structure of defects of DND resulting from forming microcrystals by HPHT sintering, as well as estimating the possibility of obtaining of the luminescense centers (nitrogen-vacancy) in microcrystals obtained by sintering of DND particles.

Chemical composition of surface and structure of defects in diamond single crystals produced from detonation nanodiamonds