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EPR of new phosphorus-containing centers in synthetic diamonds

  • Current NMR and EPR Spectroscopy Methods in Structural Chemistry of Complex Crystals, Glasses, Composites, and Biological Membranes
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Abstract

The effect is studied of electron and X-ray irradiation on phosphorous centers in synthetic diamonds grown in the P-C medium by the Bars technology. After exposure to X-ray irradiation, a new paramagnetic phosphorus-containing center NP6, in addition to the phosphorous centers NP4 and NP5, is observed in diamonds annealed at a temperature of 2300°C and pressure of 7.5 GPa. The spectrum of NP6 is simulated to give the following parameters: A 1 = 29.42 G, A 2 = 23.28 G, A 3 = 75.85 G, g 1 = 2.00085, g 2 = 2.00083, and g 3 = 2.00083. The NP4-NP6 centers are assumed to be genetically related to the three nitrogenphosphorous centers NP1-NP3 and be formed as a result of the transformation of the tetrahedral environment around the phosphorous atom into an octahedral environment at an annealing temperature of 2300°C. The synthetic diamonds annealed at 2300°C were successively exposed to irradiation with electrons with energies of 3.5 MeV (5×1017 e/cm2) and annealing at temperatures of 500°C and 700°C. The EPR method is used to find that annealing of the electron-irradiated crystals at 700°C leads to the formation of a new paramagnetic center with spin S = 1 and hyperfine structure (HFS) from one phosphorus atom with the parameters: g = 2.0012, D = 19.7 G, and A(P) = 3.6 G. The center is likely to have an eightvacancy chain structure with a phosphorus atom located at the center.

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Authors and Affiliations

  1. A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia

    V. A. Nadolinnyi & A. Yu. Komarovskikh

  2. V. S. Sobolev Institute of Geology and Mineralogy, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia

    Yu. N. Pal’yanov & I. N. Kupriyanov

Authors
  1. V. A. Nadolinnyi
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  2. A. Yu. Komarovskikh
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  3. Yu. N. Pal’yanov
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  4. I. N. Kupriyanov
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Correspondence to V. A. Nadolinnyi.

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Original Russian Text Copyright © 2013 by V. A. Nadolinnyi, A. Yu. Komarovskikh, Yu. N. Pal’yanov, I. N. Kupriyanov

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Translated from Zhurnal Strukturnoi Khimii, Vol. 54, Supplement 1, pp. S88–S93, 2013.

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Nadolinnyi, V.A., Komarovskikh, A.Y., Pal’yanov, Y.N. et al. EPR of new phosphorus-containing centers in synthetic diamonds. J Struct Chem 54 (Suppl 1), 86–91 (2013). https://doi.org/10.1134/S0022476613070068

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  • DOI: https://doi.org/10.1134/S0022476613070068

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