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Science 12 March 1999:
Vol. 283. no. 5408, pp. 1720 - 1723
DOI: 10.1126/science.283.5408.1720
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Reports

"Debye-Scherrer Ellipses" from 3D Fullerene Polymers: An Anisotropic Pressure Memory Signature

L. Marques, 1 M. Mezouar, 2 J.-L. Hodeau, 3* M. Núñez-Regueiro, 4 N. R. Serebryanaya, 5 V. A. Ivdenko, 5 V. D. Blank, 6 G. A. Dubitsky 6

High-pressure studies on fullerenes have previously shown the existence of one- and two-dimensional (2D) polymerized C60 structures. Synchrotron radiation measurements, performed on C60 samples quenched from 13 gigapascals and 820 kelvin, yield unambiguous proof for the existence of a three-dimensional (3D) polymerized C60 derivative. Moreover, unusual ellipsoidal Debye-Scherrer diffraction patterns are observed, which shows that the giant anisotropic deformation induced by the nonhydrostatic compression is retained in the quenched samples. The multiple bonding possibilities of the highly symmetrical C60 allow the retention (down to ambient pressure) of the deformation, a phenomenon reported previously only under high pressure.

1 Departamento de Física, Universidade de Aveiro, 3800 Aveiro, Portugal.
2 European Synchrotron Radiation Facility, 38041 Grenoble, France.
3 Laboratoire de Cristallographie, CNRS, Boite Postale 166 Cedex 09, 38042 Grenoble, France.
4 Centre de Recherches sur les Très Basses Températures, CNRS, Boite Postale 166 Cedex 09, 38042 Grenoble, France.
5 Institute of Spectroscopy RAS, Troitsk Moscow Region, 142092 Russia.
6 Research Center for Superhard Materials, 7-a Centralnaya Street, Troitsk Moscow Region, 142092 Russia.
*   To whom correspondence should be addressed. E-mail: hodeau{at}polycnrs-gre.fr

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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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