Nitrogen and hydrogen aggregation in natural octahedral and cuboid diamonds

D. A. Zedgenizov, A. A. Kalinin, V. V.K. Alinina, Yu N. Palyanov, V. S. Shatsky

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Transformations of nitrogen and hydrogen defects in natural octahedral and cuboid diamonds after multi-stage annealing at P = 6 GPa and T = 2200°C are presented. It has been observed that nitrogen aggregation from A- to B-defects in octahedral diamonds has gradually increased. This transformation of nitrogen has proceeded more rapidly in cuboid diamonds. One may confirm that most of the cuboid diamonds characterized by a low nitrogen aggregation state were not annealed over a long period at mantle conditions and their formation occurred shortly before transportation to the Earth's surface. Unlike octahedral diamonds, cuboid diamonds show a considerable increase in the intensity of the primary hydrogen-related peaks after the annealing, thus implying involvement of sites to which the hydrogen can bond and become IR-active, but these sites are simply not available in the octahedral diamonds. The magnitude to which peak 3107 cm-1 is increased after annealing has been found to be correlated with the total nitrogen content in cuboid diamonds. This supports the suggestion that the vibrational system with a primary line at 3107 cm-1corresponds to a C-H vibration bonded to some form of aggregated nitrogen.

Original languageEnglish
Pages (from-to)181-192
Number of pages12
JournalGeochemical Journal
Volume51
Issue number2
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Aggregation
  • Annealing
  • Cuboid
  • Defects
  • Diamond
  • HP-HT treatment
  • Hydrogen
  • Nitrogen
  • aggregation
  • hydrogen
  • annealing
  • ORIGIN
  • cuboid
  • KINETICS
  • CUBIC HABIT
  • GROWTH
  • TRANSFORMATION
  • nitrogen
  • INFRARED-ABSORPTION
  • IMPURITY DEFECTS
  • FEATURES
  • ISOTOPES
  • diamond
  • defects
  • CRYSTALS

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