Influence of the pressure-temperature treatment on the polymerization of C60 single crystals at 2 GPa - 700 K

• X-ray diffraction and Raman spectroscopy have been used to characterize the structures obtained when C-60 single crystals are treated at 2GPa-700K. Two different experimental procedures have been applied: the temperature is raised before the pressure is applied, or the opposite. The "heating-then-pressing" path leads to the tetragonal polymer structure (P4(2)/mmc) together with a minor fraction of rhombohedral structure, which confirms previous results. In contrast, the "pressing-then-heating" path leads to a different state presenting similarities with both the rhombohedral and the disordered dimer structures. The results are discussed in light of the orientational and dynamical aspects of the C60 polymerization.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

C60

fullerenes

high pressure

polymers

orthorhombic

tetragonal

phase transformation

structural transformation

high pressure

high temperature

Raman spectroscopy

X-ray diffraction

XRD

dimers

Condensed matter physics

Kondenserade materiens fysik

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