Research output: Contribution to journal › Article › peer-review
Nitrogen and hydrogen aggregation in natural octahedral and cuboid diamonds. / Zedgenizov, D. A.; Kalinin, A. A.; Alinina, V. V.K. et al.
In: Geochemical Journal, Vol. 51, No. 2, 01.01.2017, p. 181-192.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Nitrogen and hydrogen aggregation in natural octahedral and cuboid diamonds
AU - Zedgenizov, D. A.
AU - Kalinin, A. A.
AU - Alinina, V. V.K.
AU - Palyanov, Yu N.
AU - Shatsky, V. S.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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.
AB - 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.
KW - Aggregation
KW - Annealing
KW - Cuboid
KW - Defects
KW - Diamond
KW - HP-HT treatment
KW - Hydrogen
KW - Nitrogen
KW - aggregation
KW - hydrogen
KW - annealing
KW - ORIGIN
KW - cuboid
KW - KINETICS
KW - CUBIC HABIT
KW - GROWTH
KW - TRANSFORMATION
KW - nitrogen
KW - INFRARED-ABSORPTION
KW - IMPURITY DEFECTS
KW - FEATURES
KW - ISOTOPES
KW - diamond
KW - defects
KW - CRYSTALS
UR - http://www.scopus.com/inward/record.url?scp=85017103707&partnerID=8YFLogxK
U2 - 10.2343/geochemj.2.0452
DO - 10.2343/geochemj.2.0452
M3 - Article
AN - SCOPUS:85017103707
VL - 51
SP - 181
EP - 192
JO - Geochemical Journal
JF - Geochemical Journal
SN - 0016-7002
IS - 2
ER -
ID: 10265701