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Orientational disorder in solvent-free solid c70.

G B Vaughan, P A Heiey, D E Luzzi

    Science (New York, N.Y.)
    |November 29, 1991
    PubMed
    Summary
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    High-temperature C(70) structures were analyzed. Solvent-free samples form face-centered cubic crystals, while solvent-containing samples form hexagonal close-packed crystals, revealing distinct structural behaviors.

    Area of Science:

    • Solid-state chemistry
    • Materials science
    • Crystallography

    Background:

    • Fullerenes, such as C(70), exhibit complex structural behaviors influenced by processing conditions.
    • Understanding the high-temperature phases of fullerenes is crucial for their application in materials science.

    Purpose of the Study:

    • To determine the high-temperature crystal structure of solvent-free C(70).
    • To compare the structures of C(70) prepared with and without residual solvent.

    Main Methods:

    • High-resolution X-ray powder diffraction
    • Electron microscopy
    • Crystallization from solution
    • Sublimation

    Main Results:

    Related Experiment Videos

  • Solvent-free C(70) primarily forms face-centered cubic crystals with stacking faults.
  • C(70) crystallized from solution contains residual toluene and forms hexagonal close-packed crystals.
  • Annealing reduces the hexagonal phase in solvent-free samples.
  • Both phases exhibit complete orientational disorder.

    • Conclusions:

    • The presence of solvent significantly impacts the high-temperature crystal structure of C(70).
    • Face-centered cubic is the dominant high-temperature phase for pure C(70).
    • Stacking faults are a notable feature of the cubic phase.