A new hexagonal phase of fullerene C60

被引：42

作者：

Céolin, R

Tamarit, JL

López, DO

Barrio, M

Agafonov, V

Allouchi, H

Moussa, F

Szwarc, H

机构：

[1] Univ Politecn Catalunya, ETSEIB, Dept Fis & Engn Nucl, E-08028 Barcelona, Spain

[2] Fac Pharm, Chim Phys Lab, F-37200 Tours, France

[3] Univ Paris Sud, Lab Chim Phys Mat Amorphes, CNRS, URA D1104, F-91405 Orsay, France

来源：

CHEMICAL PHYSICS LETTERS | 1999年 / 314卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(99)01091-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new phase of fullerene C-60 with a simple hexagonal unit cell with 6/mmm symmetry was grown by slowly evaporating solutions of C-60 in dichloromethane. X-ray measurements reveal that the c/a ratio is 1.616 at 298 K and increases as temperature decreases. At low temperature, it seems to extrapolate to 1.633, the ideal ratio for a close-packed hexagonal lattice. The unit cell volume which is higher than that of the usual cubic C-60 phases at high temperature decreases near 90 K. A structural model is proposed according to which a 3-fold molecular axis is parallel to the 6-fold crystallographic z-axis. This suggests that the molecules could reorient around this axis at high temperature. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：21 / 26

页数：6

共 13 条

[1] C-60-CCl4 phase diagram: Polythermal behaviour of solvates C-60, 12 CCl4 and C-60, 2 CCl4 [J].