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

100%
Kulbachinskii V., Bulychev B., Kytin V., Krechetov A., Tarasov V., Konstantinova E., Velikodnyi Y., Muravlev Y., Zoteev A.
Open Physics
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2010
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vol. 8
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issue 1
101-112
EN
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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Problematyczność identyfikacji impaktu na podstawie geologicznych mikrośladów

72%
Brachaniec T., Broszkiewicz A.
Acta Societatis Metheoriticae Polonorum
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2013
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vol. 4
28-36
EN
Geological record contains macro and micro traces of the impacts. Macro traces are much easier to interpretation and diagnosis. Undisputed micro evidences of the impact are platinum group element anomalies and shock minerals. In the proximal parts of strewnfield may occur spherules, iron spinels, fullerenes or even deformed fossils. Nevertheless, due to problematic in the recognition and determine the origin does not qualify them as clear evidences of the impact.
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