Ultrahard and superhard carbon phases produced from C60 by heating at high pressure: structural and Raman studies

Бланк, В. Д.; Буга, С. Г.; Serebryanaya, N. R.; Денисов, В. Н.; Dubitsky, G.A.; Ivlev, A.N.; Mavrin, B. N.; Popov, M.

doi:10.1016/0375-9601(95)00564-j

Cited by 144 publications

(63 citation statements)

References 24 publications

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“…Some amorphous phases produced show super-or ultrahardness, such that they can even break diamonds. [2] Cold compression of C 60 s results in an amorphization of the material above 20 GPa and no superhard phase has been observed even at higher pressures. [12][13][14] Recently, Wang et al reported that compression of solvated fullerenes (C 60 /m-xylene) produces a carbon phase composed of ordered amorphous carbon clusters (OACC).…”

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confidence: 96%

“…Due to its flexibility in forming sp, sp 2 , and sp 3 bonds, carbon can adopt a wide range of structures. Depending on experimental conditions, one carbon allotrope can transform into another with dramatically different electronic and mechanical properties.…”

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confidence: 99%

“…Thanks to the strong C-C covalent bonds, many carbon phases, including both crystalline and noncrystalline forms, are found to exhibit high hardness and have important technological applications in different fields. The structures and the formation mechanisms of hard carbon phases thus have been subjected to numerous experimental [1][2][3][4][5][6][7][8][9] and theoretical [10,11] works.…”

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confidence: 99%

“…[1][2][3][4][5][6] At high pressure and high temperature conditions, C 60 may transform into 3D polymer with hardness comparable to that of cubic BN or into amorphous fullerite phases. Some amorphous phases produced show super-or ultrahardness, such that they can even break diamonds.…”

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confidence: 99%

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Pressure-induced transformation and superhard phase in fullerenes: The effect of solvent intercalation

Yao

Cui

Xiao

et al. 2013

Applied Physics Letters

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Pressure-induced transformation and superhard phase in fullerenes: the effect of solvent intercalation.Applied Physics Letters, 103 (7) Abstract:We studied the behavior of solvated and desolvated C 60 crystals under pressure by in situ Raman spectroscopy. The pressure-induced bonding change and structural transformation of C 60 s are similar in the two samples, both undergoing deformation and amorphization.Nevertheless, the high pressure phases of solvated C 60 can indent diamond anvils while that of desolvated C 60 s cannot. Further experiments suggest that the solvents in the solvated C 60 act as both spacers and bridges by forming covalent bonds with neighbors in 3D network at high pressure, and thus, a fraction of fullerenes may preserve the periodic arrangement in spite of their amorphization.

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confidence: 96%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Pressure-induced transformation and superhard phase in fullerenes: The effect of solvent intercalation

Yao

Cui

Xiao

et al. 2013

Applied Physics Letters

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“…Polymeric fullerenes are of particular interest because of their possible applications as super-hard compounds [1]. In particular, the charged polymers of the A 1 C 60 (A=K, Rb, Cs) system have been widely investigated.…”

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confidence: 99%

The electronic structure of polymerized fullerenes and dimerized heterofullerenes

Pichler

Knupfer²,

Golden³

et al. 1997

Applied Physics A: Materials Science & Processing

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The electronic structure of polymerized fullerenes and dimerized heterofullerenes Pichler, T.; Knupfer, M.; Golden, M.S.; Fink, J.; Winter, J; Haluska, M.; Kuzmany, H.; Keshavarz, K.; Bellavia-Lund, C.; Sastre, A. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Abstract. We present studies of the electronic structure of polymerized orthorhombic Rb 1 C 60 and dimerised C 59 N using electron energy-loss spectroscopy in transmission. From the C1s excitation spectra a reduced density of π* states is observed for polymerized Rb 1 C 60 . This is in contrast to (C 59 N) 2 and can be explained by the different type of 'doping' and by the different bonding between the fullerene molecules in the two systems. Additional information about the optical properties was obtained from the low energy loss function. Using a Kramers-Kronig analysis, the dielectric function, (ε), and the optical conductivity, (σ), have been derived. ε(0) and the onset of the spectral weight have been compared between the polymer, the dimer and C 60 . This onset of spectral weight is found to be at 1.2 and 1.4 eV for o-Rb 1 C 60 and for (C 59 N) 2 , respectively.

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Photo-Induced Structural Transformation of C60 Single Crystals under High Pressure

Mitani

Matsuishi

Onari

2001

phys. stat. sol. (b)

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Ultrahard and superhard carbon phases produced from C60 by heating at high pressure: structural and Raman studies

Cited by 144 publications

References 24 publications

Pressure-induced transformation and superhard phase in fullerenes: The effect of solvent intercalation

Pressure-induced transformation and superhard phase in fullerenes: The effect of solvent intercalation

The electronic structure of polymerized fullerenes and dimerized heterofullerenes

Photo-Induced Structural Transformation of C60 Single Crystals under High Pressure

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