Novel rare gas interstitial fullerenes of C60 with Ar, Kr and Xe

Gadd, G. E.; Moricca, S.; Kennedy, S.J.; Elcombe, Margaret M.; Evans, P. J.; Blackford, MG; Cassidy, David J.; Howard, Christopher; Prasad, P. B. V.; Hanna, Jeremy; Burchwood, A.; Levy, Donald H.

doi:10.1016/s0022-3697(97)00096-6

Cited by 54 publications

(34 citation statements)

References 14 publications

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“…When intercalated at high pressure but at 300°C, only 10% of octahedral voids are filled; the filling can reach 66% if C 60 is saturated at 575°C [6]. In the present case, thermogravimetric analysis (TGA) showed a weight loss between 6 and 7% indicative of a stoichiometry of Xe 0.39-0.45 C 60 .…”

Section: Methodsmentioning

confidence: 50%

“…It can be seen that our fine-grain samples, in addition to the fcc phase of Xe-doped fullerite C 60 , contain about 10% of another phase which could in no way be indexed as fcc. It should be noted that in the «as-prepared» Xe-doped powder samples, no other than but fcc phase was detected [6] either in x-ray or neutron diffraction experiments. The reflections belonging to this new phase are indicated in Fig.…”

Section: Resultsmentioning

confidence: 96%

“…This circumstance was utilized at the very beginning of the fullerene era resulting in the high-T c superconductivity of an organic crystal (C 60 doped with alkali metals) [1]. Afterwards, C 60 was intercalated with rare gas atoms [2][3][4][5][6][7] and molecules of different symmetries and sizes [8][9][10][11][12][13][14]. It is commonly accepted that changes in the physical properties of fullerite C 60 brought about by intercalation with neutral species are mainly due to the doping-related change in the molar volume.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, when the voids are filled with the larger rare gas atoms such as Xe or with simpler closed-shell molecules, the anisotropic interaction between C 60 molecules weakens; and the rotation of the C 60 molecules loosens up, resulting in lower critical temperatures for both transformations [6,7]. Moreover, when the dopant species are certain molecules, for example, CO or NO, there are indications [15,16] that no freezing into an orientational glass state was observed.…”

Section: Introductionmentioning

confidence: 99%

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Hysteretic phenomena in Xe-doped C60 from x-ray diffraction

Prokhvatilov

Galtsov

Legchenkova

et al. 2005

Low Temperature Physics

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Polycrystalline fullerite Ñ 60 intercalated with Xe atoms at 575 K and a pressure of 200 MPa was studied by powder x-ray diffraction. The integrated intensities of a few brighter reflections have been utilized to evaluate the occupancy of the octahedral interstitial sites in Ñ 60 crystals, which turned out to be (34±4) %, and in good agreement with another independent estimate. It is found that reflections of the (h00) type become observable in Xe-doped Ñ 60 . The presence of xenon in the octahedral sites affects both the orientational phase transition as well as the glassification process, decreasing both characteristic temperatures as well as smearing the phase transition over a greater temperature range. Considerable hysteretic phenomena have been observed close to the phase transition and the glassification temperature. The signs of the two hysteresis loops are opposite. There is reliable evidence that at lowest temperatures studied the thermal expansion of the doped crystal is negative under cool-down.

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Section: Methodsmentioning

confidence: 50%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hysteretic phenomena in Xe-doped C60 from x-ray diffraction

Prokhvatilov

Galtsov

Legchenkova

et al. 2005

Low Temperature Physics

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“…2͔͒. In particular, it has been shown that the intercalation of small diatomic molecules and rare gases ͑N 2 , O 2 , 3-5 CO, 6 Ar, Kr, Xe, 7 …͒ sensitively modifies the phase diagram of C 60 .…”

Section: Introductionmentioning

confidence: 99%

Lattice dynamics of a rotor-stator molecular crystal: Fullerene-cubaneC60⋅C8H8

et al. 2010

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The dynamics of fullerene-cubane ͑C 60 ·C 8 H 8 ͒ cocrystal is studied combining experimental ͓x-ray diffuse scattering, quasielastic and inelastic neutron scattering ͑INS͔͒ and simulation ͑molecular dynamics͒ investigations. Neutron scattering gives direct evidence of the free rotation of fullerenes and of the libration of cubanes in the high-temperature phase, validating the "rotor-stator" description of this molecular system. X-ray diffuse scattering shows that orientational disorder survives the order/disorder transition in the low-temperature phase, although the loss of fullerene isotropic rotational diffusion is featured by the appearance of a 2.2 meV mode in the INS spectra. The coupling between INS and simulations allows identifying a degeneracy lift of the cubane librations in the low temperature phase, which is used as a tool for probing the environment of cubane in this phase and for getting further insights into the phase transition mechanism.

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