Abstract
The IR-peak 1450 cm–1 (H1a-center) associated with nitrogen interstitials have been studied in nitrogen-bearing diamonds synthesized at high P-T parameters in the Fe–Ni–C system. FTIR study shows that manifestation of this nitrogen form is restricted to the regions of active transformation of C-defects into A-defects, which confirms the connection of its formation with C => A aggregation process. An examination of the dependence of the 1450 cm–1 peak on the degree of nitrogen aggregation indicates that H1a-centers are not only formed during C/A aggregation but also disappear simultaneously with the end of C => A transformation. Established facts suggest direct involving of nitrogen as interstitials in the C => A aggregation and serve as strong experimental argument in support of the “interstitial” mechanism of nitrogen migration during aggregation in diamonds containing transition metals.
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Original Russian Text © Yu.V. Babich, B.N. Feigelson, A.I. Chepurov, 2016, published in Geokhimiya, 2016, No. 10, pp. 952–957.
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Babich, Y.V., Feigelson, B.N. & Chepurov, A.I. Manifestation of nitrogen interstitials in synthetic diamonds obtained using a temperature gradient technique (Fe–Ni–C system). Geochem. Int. 54, 922–927 (2016). https://doi.org/10.1134/S0016702916100025
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DOI: https://doi.org/10.1134/S0016702916100025