Structure, dynamics, and phase transitions in the fullerene derivatives O and
- 1 July 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 54 (1), 124-131
- https://doi.org/10.1103/physrevb.54.124
Abstract
The effect of perturbing the icosohedral symmetry of by the addition of the side groups -O and - upon orientational order-disorder and glass transitions in solid has been studied by a combination of high-resolution capacitance dilatometry and single-crystal x-ray and powder inelastic neutron scattering. Both fullerene derivatives O (epoxide) and (6,5-annulene) are shown to undergo a sequence of transitions similar to that found in pure , i.e., a first-order orientational ordering transition just below room temperature followed by an orientational glass transition at lower temperatures. Although the exact origin of the glass transition in is unclear, the glass transition in O has the same origin as that in , with a significantly higher degree of order due to a larger energy difference between pentagon and hexagon orientations. The dilatometric data at the glass transition indicate that, in contrast to , the ground-state orientation of both O and molecules is that with the smallest volume, also demonstrating a significant influence of the side groups upon the details of the structure. A possible explanation of these differences in terms of steric effects is proposed. © 1996 The American Physical Society.
Keywords
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