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Study of local concentration of single substitutional nitrogen atoms in microdiamonds from the Kokchetav massif

¹ Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia,
² Institute of Mineralogy and Petrography SB RAS, Novosibirsk, Russia

^* Corresponding author, e-mail: spectr{at}che.nsk.su

In this communication we present an estimation of the concentration of single substitutional nitrogen atoms (P1 centre) from EPR data in Kokchetav diamonds. We first performed an analysis of local P1 centre concentrations using van Wyk’s treatment (van Wyk et al., 1997) of the line width of the resolved EPR spectrum. Also by analysing the dependence of the line-width of the broad exchange line on the P1 concentration in range higher than 1000 ppm in synthetic diamonds, we obtained a calibration curve allowing the estimation of the local P1 centre concentration higher than 1000 ppm and the local volumes occupied by substitutional nitrogen atoms without taking measurements of microcrystalline volume. In addition to the development of a method for calculating high local nitrogen concentrations, the aggregation process in P,T-treated Kokchetav diamonds has been given considerable attention and it was shown that the rate of nitrogen aggregation in these diamonds is consistent with data given in Evans (Evans & Qi, 1982).

Key-words: microdiamond, Kokchetav massif, nitrogen aggregation state, EPR spectroscopy, high-temperature high-pressure treatment.

This article has been cited by other articles:

				V. A. Pechnikov and F. V. Kaminsky Diamond potential of metamorphic rocks in the Kokchetav Massif, northern Kazakhstan European Journal of Mineralogy, June 1, 2008; 20(3): 395 - 413. [Abstract] [Full Text] [PDF]