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<p>Diamond micropowders with a boron content of 1 and 2.5% that have been synthesized under high pressure and high temperature conditions and studied. The method of nuclear magnetic resonance on <sup>13</sup>C and <sup>11</sup>B nuclei has been used for a comparative analysis of boron-doped diamond and boron-doped graphite. It has been shown that the structure of diamonds with a high boron content is disordered and contains a significant amount of carbon with trigonal coordination. The main signal in the <sup>11</sup>B spectra of diamond microcrystals is due to the sum of contributions from single boron atoms with tetragonal and trigonal carbon environments. An additional signal in the spectra with a chemical shift of more than 60 ppm can be due to boron atoms in the areas of dislocation clusters, sub-boundaries, and other defective areas.</p>

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13C and 11B NMR Spectroscopy of High-Pressure High-Temperature Boron-Doped Diamonds

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月1日

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  • Z. N. Volkova,
  • V. P. Filonenko,
  • R. Kh. Bagramov,
  • I. P. Zibrov,
  • N. M. Shchelkachev,
  • G. D. Rybalov,
  • V. V. Brazhkin

摘要

Diamond micropowders with a boron content of 1 and 2.5% that have been synthesized under high pressure and high temperature conditions and studied. The method of nuclear magnetic resonance on 13C and 11B nuclei has been used for a comparative analysis of boron-doped diamond and boron-doped graphite. It has been shown that the structure of diamonds with a high boron content is disordered and contains a significant amount of carbon with trigonal coordination. The main signal in the 11B spectra of diamond microcrystals is due to the sum of contributions from single boron atoms with tetragonal and trigonal carbon environments. An additional signal in the spectra with a chemical shift of more than 60 ppm can be due to boron atoms in the areas of dislocation clusters, sub-boundaries, and other defective areas.