Raman spectroscopy and x-ray diffraction measurements on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>compressed in a diamond anvil cell

Li, Y.; Rhee, J. H.; Singh, D.; Sharma, S. C.

doi:10.1103/physrevb.68.024106

Cited by 12 publications

(14 citation statements)

References 51 publications

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“…1 -3 Recently, we published Raman scattering and x-ray diffraction data on molecular C 60 compressed in a DAC. 4,5 In this study, we observed significant and remarkable differences in the pressure dependences of the Raman spectra measured with and without the use of MEW. In particular, we observed that: (1) the wavenumber of the A g 2 band of molecular C 60 increases linearly with increasing uniaxial pressure between ambient and 40 kbar, (2) between 40 and 80 kbar, the wavenumbers deviate from linearity, exhibit a turnaround at about 73 kbar, and subsequently resume the linear pressure dependence up to about 311 kbar, and (3) when MEW is used as the pressure-transmitting medium, the pressure dependence of the wavenumbers, although qualitatively similar, exhibits significant differences between (a) the pressure at which non-linearity sets in and (b) the range of pressures over which the non-linearity persists.…”

Section: Introductionmentioning

confidence: 80%

“…Here, we present results for the wavenumber, linewidth and relative intensity of the Raman bands of MEW as functions of pressure at room temperature. Since our primary interest is to understand better the recently observed differences in the Raman spectroscopic data for C 60 , compressed in a DAC with and without the use of MEW, 4 we measured the Raman spectra of MEW for a range of wavenumbers that overlaps with the range used in our experiments on molecular C 60 , i.e. from 1400 to 1600 cm 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Excellent agreement was observed between our measurements and the well-known results for each of the samples. 4 The mixture, ME or MEW, and a ruby crystal, were loaded in a DAC containing a stainless-steel gasket of 200 µm diameter and a 250 µm deep indentation to hold the liquid. Applied pressures were determined by using the standard relationship between the applied pressures and resulting shift in the ruby fluorescence peaks.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pressure on the Raman spectra of methanol-ethanol-water mixture at room temperature

Singh

Sharma

2005

J. Raman Spectrosc.

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We measured Raman spectra for liquid methanol, ethanol, water and their mixture under ambient conditions. We also measured these spectra for wavenumbers in the range 1400-1600 cm −1 for methanol-ethanol (4 : 1) and methanol-ethanol-water (16 : 3 : 1) mixtures as functions of pressure up to 62 kbar at room temperature. We present results for the wavenumber, linewidth and relative intensity of the prominent bands as functions of pressure. These results should be useful for understanding the pressure (hydrostatic) dependence of the Raman spectra of solids.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of pressure on the Raman spectra of methanol-ethanol-water mixture at room temperature

Singh

Sharma

2005

J. Raman Spectrosc.

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“…Surprisingly, high pressure experiments in untreated C 60 fullerenes reported in the recent literature are also controversial: While some works report structural phase transitions occurring at relatively low pressures [10][11][12][13][14], others give evidences for the stability of the crystal structure up to about 20 GPa [15,16]. In addition, striking anomalies found in the phonon properties, such as plateaus differing in position, and different pressure induced shifts of Raman bands were observed [17][18][19]. A possible reason for those controversies and anomalies is the interaction of the Pressure Transmitting Fluid, PTF, in the pressure cell with the C 60 surface.…”

Section: Introductionmentioning

confidence: 91%

Interaction of a methanol molecule with C₆₀ under pressure

Lemos

Guerini

Abreu

et al. 2006

Physica Status Solidi (b)

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The interaction between a C 60 molecule with methanol, the main composition of the currently employed pressure transmitting fluid was studied. The simulations include C 60 under hydrostatic or uniaxial pressure interacting with methanol. The relaxed structure as well as the binding energies and the electronic density of states were obtained. The analysis of binding energy indicates that the methanol molecule is attracted to C 60 under hydrostatic pressure, while repulsed if the pressure is uniaxial. The results establish that the mechanisms of interaction between this nanometer scale system and the medium may change during the compression. Density of states results indicate severe changes in the Raman spectrum of the system under compression.

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“…The phase diagram and other high-pressure properties of C 60 have been investigated extensively using static techniques. 4,[8][9][10][11][12][13][14][15] The transitions of graphite and buckyballs to diamond involve major reconstruction of bonding and coordination, and thus are loadingrate-dependent processes. Dynamic experiments such as shock waves may be advantageous for revealing the transition mechanisms by metastable recovery of transient structures formed upon ultrafast loading.…”

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Novel crystalline carbon-cage structure synthesized from laser-driven shock wave loading of graphite

Luo

Tschauner

Tierney

et al. 2005

The Journal of Chemical Physics

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We report a novel crystalline carbon-cage structure synthesized from laser-driven shock wave loading of a graphite-copper mixture to about 14± 2 GPa and 1000± 200 K. Quite unexpectedly, it can be structurally related to an extremely compressed three-dimensional C 60 polymer with random displacement of C atoms around average positions equivalent to those of distorted C 60 cages. Thus, the present carbon-cage structure represents a structural crossing point between graphite interlayer bridging and C 60 polymerization as the two ways of forming diamond from two-dimensional and molecular carbon. Understanding the graphite-diamond transition mechanisms including transitory or intermediate phases may open windows for a more efficient synthesis of diamond. The graphite-diamond transition is also interesting by itself as a paradigm of reconstructive transitions involving changes in coordination, bonding and dimensionality, and for its possible relations with other transition routes to diamond from, for instance, C 60 polymers. However, the detailed mechanisms still remain unsettled despite considerable experimental and theoretical efforts motivated by the technological and scientific significance.Carbon is a complicated system 1 rich in polymorphs due to its ability to form sp-, sp 2 -, and sp 3 -hybridized C-C bonds including molecular phases such as buckyballs and buckytubes, the two-dimensional ͑2D͒ graphite, and threedimensional ͑3D͒ tetrahedral network of diamond. C 60 polymers, 2-5 carbyne, 6 and hypothetical cage structures such as carbon zeolites 7 establish intermediate phases intriguing for their structures and properties. The phase diagram and other high-pressure properties of C 60 have been investigated extensively using static techniques. 4,[8][9][10][11][12][13][14][15] The transitions of graphite and buckyballs to diamond involve major reconstruction of bonding and coordination, and thus are loadingrate-dependent processes. Dynamic experiments such as shock waves may be advantageous for revealing the transition mechanisms by metastable recovery of transient structures formed upon ultrafast loading. We have demonstrated for silica ͑another paradigm system͒ that a transient structure intermediate between tetrahedrally and octahedrally coordinated phases forms upon shock wave loading of quartz and coesite. 16 Diamond was synthesized by conventional shock wave ͑explosives or gas guns͒ loading of graphite alone or graphite-copper powder mixture to about 20 GPa and above. [17][18][19][20] Recent explosive-driven shock wave loading of pyrolytic graphite to about 15 GPa yielded several carbon allotropes including carbyne, a diamondlike phase and possibly fullerene. 21 It is worth noting that C 60 fullerene synthesis was pioneered by vaporizing graphite using lasers. 22 Naturally occurring fullerenes in meteorites and sediments were inferred to have formed during terrestrial impact. 23,24 Conventional shock wave loading of C 60 fullerene yielded amorphous diamond. 25 The differences in heating and strain rates, po...

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Raman spectroscopy and x-ray diffraction measurements onC60compressed in a diamond anvil cell

Cited by 12 publications

References 51 publications

Effect of pressure on the Raman spectra of methanol-ethanol-water mixture at room temperature

Effect of pressure on the Raman spectra of methanol-ethanol-water mixture at room temperature

Interaction of a methanol molecule with C₆₀ under pressure

Novel crystalline carbon-cage structure synthesized from laser-driven shock wave loading of graphite

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Raman spectroscopy and x-ray diffraction measurements onC60compressed in a diamond anvil cell

Cited by 12 publications

References 51 publications

Effect of pressure on the Raman spectra of methanol-ethanol-water mixture at room temperature

Effect of pressure on the Raman spectra of methanol-ethanol-water mixture at room temperature

Interaction of a methanol molecule with C60 under pressure

Novel crystalline carbon-cage structure synthesized from laser-driven shock wave loading of graphite

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Product

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Interaction of a methanol molecule with C₆₀ under pressure