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Magnetic and structural anomalies of NanC60 (n = 2, 3)

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Kulbachinskii V., Bulychev B., Kytin V., Krechetov A., Tarasov V., Konstantinova E., Velikodnyi Y., Muravlev Y., Zoteev A.

Open Physics

2010

vol. 8

issue 1

101-112

Sodium fullerides NanC60 (n = 2, 3) have been synthesized by a liquid phase reaction and investigated with X-ray diffraction (XRD), nuclear magnetic resonance (NMR), electron paramagnetic resonance, and differential thermal analysis. XRD data indicate that the crystal structure of Na2C60 at 300 K is face centered cubic (FCC). A phase transition from primitive cubic to FCC crystal structure has been observed in this work in Na2C60 fulleride at 290 K. The transition is accompanied by the step-like change of paramagnetic susceptibility. The crystal structure of Na3C60 is more complicated than, and different from, what has been reported in the literature. A nearly seven-fold increase of paramagnetic susceptibility with increasing temperature has been observed in the Na3C60 fulleride at 240–260 K. In the same temperature range, a new line at about 255 ppm appears in the 23Na NMR spectrum, indicating a significant increase of electron density near the Na nucleus. The observed effect can be explained by a metal-insulator transition caused by a structural transition.

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1 Open Physics

1 2010

1 Bulychev B.

1 Konstantinova E.

1 Krechetov A.

1 Kulbachinskii V.

1 Kytin V.

1 Muravlev Y.

1 Tarasov V.

1 Velikodnyi Y.

1 Zoteev A.

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Magnetic and structural anomalies of NanC60 (n = 2, 3)