Nanosegregation in Na2C60

Klupp, Gyöngyi and Kamarás, Katalin and Nemes, N. M. and Matus, Péter and Quintavalle, D. and Kiss, László Ferenc and Kováts, Éva and Pekker, Sándor and Jánossy, András (2005) Nanosegregation in Na2C60. In: Electronic properties of novel nanostructures: XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials. AIP Conference Proceedings (786). American Institute of Physics (AIP), New York, pp. 17-20. ISBN 0735402752

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Abstract

There is continuous interest in the nature of alkali metal fullerides containing C(4)(60) and C(2)(60), because these compounds are believed to be nonmagnetic Mott–Jahn–Teller insulators. This idea could be verified in the case of A(4)C(60), but Na(2)C(60) is more controversial. By comparing the results of infrared spectroscopy and X-ray diffraction, we found that Na(2)C(60) is segregated into 3-10 nm large regions. The two main phases of the material are insulating C(60) and metallic Na(3)C(60). We found by neutron scattering that the diffusion of sodium ions becomes faster on heating. Above 470 K Na(2)C(60) is homogeneous and we show IR spectroscopic evidence of a Jahn–Teller distorted C(2)(60) anion.

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