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INTRODUCTION The synthesis and characterization of het-erofullerenes are very challengeable research topics because of application in superconductivity, photo-electronics, organic magnetism and even nanotubes. Pradeep et al.(1991) studied the interaction between nitrogen and fullerenes and obtained nitrogen deriva-tives of C60 and C70 such as C59N2, C59N4, C59N6 and C70N2 by contact-arc vaporization of graphite in a partial N2 or NH3 atmosphere. Yu et al.(1995) syn-thesized carbon n… 相似文献
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