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Science 10 June 1994:
Vol. 264. no. 5165, pp. 1570 - 1572
DOI: 10.1126/science.264.5165.1570
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Articles

New Phases of C60 Synthesized at High Pressure

Y. Iwasa 1, T. Arima 2, R. M. Fleming 1, T. Siegrist 1, O. Zhou 1, R. C. Haddon 1, L. J. Rothberg 1, K. B. Lyons 1, H. L. Carter Jr. 1, A. F. Hebard 1, R. Tycko 1, G. Dabbagh 1, J. J. Krajewski 1, G. A. Thomas 1, and T. Yagi 3

1 AT&T Bell Laboratories, Murray Hill, NJ 07974, USA.
2 Department of Physics, University of Tokyo, Tokyo 113, Japan
3 Institute for Solid State Physics, University of Tokyo, Tokyo 106, Japan

The fullerene C60 can be converted into two different structures by high pressure and temperature. They are metastable and revert to pristine C60 on reheating to 300°C at ambient pressure. For synthesis temperatures between 300° and 400°C and pressures of 5 gigapascals, a nominal face-centered-cubic structure is produced with a lattice parameter ao = 13.6 angstroms. When treated at 500° to 800°C at the same pressure, C60 transforms into a rhombohedral structure with hexagonal lattice parameters of ao = 9.22 angstroms and co = 24.6 angstroms. The intermolecular distance is small enough that a chemical bond can form, in accord with the reduced solubility of the pressure-induced phases. Infrared, Raman, and nuclear magnetic resonance studies show a drastic reduction of icosahedral symmetry, as might occur if the C60 molecules are linked.

Submitted on February 24, 1994
Accepted on April 23, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Topochemical Polymerization of C70 Controlled by Monomer Crystal Packing.
A. V. Soldatov, G. Roth, A. Dzyabchenko, D. Johnels, S. Lebedkin, C. Meingast, B. Sundqvist, M. Haluska, and H. Kuzmany (2001)
Science 293, 680-683
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"Debye-Scherrer Ellipses" from 3D Fullerene Polymers: An Anisotropic Pressure Memory Signature.
L. Marques, M. Mezouar, J. Hodeau, M. Núñez-Regueiro, N. R. Serebryanaya, V. A. Ivdenko, V. D. Blank, and G. A. Dubitsky (1999)
Science 283, 1720-1723
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Fullerene Polymers from Solid Precursors?.
J. E. Fischer (1994)
Science 264, 1548-1549
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