Tagish Lake Meteorite Are Identifying Carbon Allotropes (14), and Electron Intermediate Between CM and CI Meteorites
R EPORTS 2800¡C (8). Polyhedral nanoparticles (5 to 30 nm) made Carbon Nanotubes, K. Tanaka, T. Yamabe, K. Fukui, the University of Illinois at Chicago and the Research of concentric layers of closed graphene sheets with a Eds. (Elsevier, Amsterdam, 1999), pp. 143Ð152. Institute for Solvothermal Technology, Japan. The nanoscale cavity in the center were produced at very 25. S. Ihara and S. Itoh, in Carbon Nanotubes, M. Endo, S. electron microscopes used in this work are operated high temperatures in arc plasma (9). They provide fur- Iijima, M. S. Dresselhaus, Eds. (Pergamon, Oxford, by the Research Resources Center at the University ther evidence that nonplanar graphite crystals can exist. 1996), pp. 77Ð85. of Illinois at Chicago. The JEM-2010F purchase was However, transformation of carbon polyhedra to onions 26. E. Osawa, M. Yoshida, M. Fujita, Mater. Res. Soc. Bull. supported by the NSF. under electron irradiation (9) suggested their instability. 19 No other polyhedral carbon structures have been re- , 33 (1994). ported so far. 27. Supported in part by the Campus Research Board of 3 July 2000; accepted 6 September 2000 4. P. M. Ajayan, in Carbon Nanotubes: Preparation and Properties, T. W. Ebbesen, Ed. (CRC Press, Boca Raton, FL, 1997), pp. 111Ð138. 5. M. S. Dresselhaus, G. Dresselhaus, P. C. Eklund, Sci- ence of Fullerenes and Carbon Nanotubes (Academic The Fall, Recovery, Orbit, and Press, Burlington, MA, 1996). 6. S. Iijima, P. M. Ajayan, T. Ichihashi, Phys. Rev. Lett. 69, 3100 (1992). Composition of the Tagish Lake 7. S. Iijima, Mater. Res. Soc. Bull. 19, 43 (1994).
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