Diamond-graphite phase transition in ultradisperse-diamond clusters

Aleksenskii, A. E.; Байдакова, М. В.; Vul, A. Ya.; Davydov, V. Yu.; Pevtsova, Yu. A.

doi:10.1134/1.1129989

Cited by 135 publications

(82 citation statements)

References 27 publications

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“…Perhaps the incorporation of hydrogen accommodates additional strain, increasing the stability field of nd. Indeed, the phase transition of graphite to nd occurs at lower (pressure/temperature) conditions for nanoscale particles (52). The large grains initially found in our study generally appeared analogous to hex nds identified at other sites (11; SI Appendix, Fig.…”

Section: Resultssupporting

confidence: 78%

Quantifying the distribution of nanodiamonds in pre-Younger Dryas to recent age deposits along Bull Creek, Oklahoma Panhandle, USA

Bement

Madden

Carter

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Significance In 2007, scientists proposed that the start of the Younger Dryas (YD) chronozone (10,900 radiocarbon years ago) and late Pleistocene extinctions resulted from the explosion of a comet in the earth’s atmosphere. The ET event, as it is known, is purportedly marked by high levels of various materials, including nanodiamonds. Nanodiamonds had previously been reported from the Bull Creek, Oklahoma, area. We investigate this claim here by quantifying the distribution of nanodiamonds in sediments of different periods within the Bull Creek valley. We found high levels of nanodiamonds in YD boundary deposits, supporting the previous claim. A second spike in nanodiamonds during the late Holocene suggests that the distribution of nanodiamonds is not unique to the YD.

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Section: Resultssupporting

confidence: 78%

Quantifying the distribution of nanodiamonds in pre-Younger Dryas to recent age deposits along Bull Creek, Oklahoma Panhandle, USA

Bement

Madden

Carter

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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“…(12) and find the diameter of nanodiamonds to be 6.2 nm. In [16] frequency redshift for 4.5 nm nanodiamonds is found to be 10 cm −1 . Using Eq.…”

Section: Mainmentioning

confidence: 98%

New explanation of Raman peak redshift in nanoparticles

Meilakhs

Koniakhin

2017

Superlattices and Microstructures

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In this letter, we propose a new model that explains the Raman peak downshift observed in nanoparticles with respect to bulk materials. The proposed model takes into account discreteness of the vibrational spectra of nanoparticles. For crystals with a cubic lattice (Diamond, Silicon, Germanium) we give a relation between the displacement of Raman peak position and the size of nanoparticles. The proposed model does not include any uncertain parameters, unlike the conventionally used phonon confinement model (PCM), and can be employed for unambiguous nanoparticles size estimation. MainIn nanoparticles the crystalline Raman peak position is downshifted and asymmetrically broadened with respect to bulk materials. Previously the * kon@mail.ioffe.ru 1 arXiv:1602.00114v1 [cond-mat.mes-hall]

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“…1). The width and position of the diamond peak at 1324 cm -1 ( sp 3 hybridization) can be used to estimate [26] the mean size of diamond particles (4-5 nm in both samples). This is in agreement with the data of direct mass spectrometric measurements of the mean size of CH-7 particles (3.9 nm) [27].…”

Section: Methodsmentioning

confidence: 99%

“…CH-7 and K-2 were synthesized under substantially different conditions. The explosive synthesis conditions can influence both the shape [30] and structure [26,31] of the surface shell of nanodiamonds. On the other hand, the chemical activity of the surface of a diamond in various media depends on the atomic structure of the surface [32,33].…”

Section: Mass Spectrometrymentioning

confidence: 99%

The chemistry of the surface of modified detonation nanodiamonds of different types

Koshcheev

Gorokhov

Gromov

et al. 2008

Russ. J. Phys. Chem. A

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-The influence of standard chemical treatment used to extract interstellar nanodiamonds from meteorites on the chemical composition of the surface of synthetic nanodiamonds with substantially different properties was studied by thermal desorption mass spectrometry and IR spectroscopy. The chemistry of the surface of nanodiamonds after treatment was substantially different from that of initial particles. The suggestion was made that the chemical structure of the surface of diamond particles in the interstellar space could be reconstructed from the data on meteorite diamonds. Mass spectrometric studies also gave information about possible mechanisms of the release of noble gases from meteorite diamonds at various temperatures.

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Diamond-graphite phase transition in ultradisperse-diamond clusters

Cited by 135 publications

References 27 publications

Quantifying the distribution of nanodiamonds in pre-Younger Dryas to recent age deposits along Bull Creek, Oklahoma Panhandle, USA

Quantifying the distribution of nanodiamonds in pre-Younger Dryas to recent age deposits along Bull Creek, Oklahoma Panhandle, USA

New explanation of Raman peak redshift in nanoparticles

The chemistry of the surface of modified detonation nanodiamonds of different types

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