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Science 29 November 1991:
Vol. 254. no. 5036, pp. 1350 - 1353
DOI: 10.1126/science.254.5036.1350
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Articles

Orientational Disorder in Solvent-Free Solid C70

GAVIN B. M. VAUGHAN 1, PAUL A. HEIEY 1, DAVID E. LUZZI 2, DEBORAH A. RICKETTS-FOOT 3, ANDREW R. MCGHIE 3, JOHN E. FISCHER 2, YIU-WING HUI 4, ALLAN L. SMITH 4, DAVID E. COX 5, WILLIAM J. ROMANOW 3, BRENT H. ALLEN 1, NNICOLE COUSTEL 2, JOHN P. MCCAULEY JR. 6, and AMOS B. SMITH III 6

1 Laboratory for Research on the Structure of Matter and Physics Department, University of Pennsylvania, Philadelphia, PA 19104
2 N. Coustel, Laboratory for Research on the Structure of Matter and Materials Science and Engineering Department, University of Pennsylvania, Philadelphia, PA 19104
3 Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104
4 Chemistry Department, Drexel University, Philadelphia, PA 19104
5 Physics Department, Brookhaven National Laboratory, Upton, NY 11973
6 Laboratory for Research on the Structure of Matter and Chemistry Department, University of Pennsylvania, Philadelphia, PA 19104

The high-temperature structure of solvent-free C70 has been determined with high-resolution x-ray powder difraction and electron microscopy. Samples crystallized from solution form hexagonal close-packed crystals that retain an appreciable amount of residual toluene, even after prolonged heating. Samples prepared by sublimation, which contain no detectable solvent, are primarily face-centered cubic with some admixture of a hexagonal phase. The relative volume of the hexagonal phase can be further reduced by annealing. The structures of both phases are described by a model of complete orientational disorder. The cubic phase contains an appreciable density of stacking faults along the [111] direction.

Submitted on October 3, 1991
Accepted on October 30, 1991


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