EPR evidence of the low temperature phase transition in C60 |
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Authors: | W Kempiński J Stankowski Z Trybuła Sz Łoś |
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Institution: | 1. Institute of Molecular Physics, Polish Academy of Sciences, ul. Krotoszyńska, 63-430 Odolanów, Poznań, Poland
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Abstract: | A standard EPR technique has been applied to perform temperature studies of polycrystalline samples of C60 fullerene. A comparison of the three main parameters of EPR spectra obtained for a C60 sample before and after (solvent free) purification has been made in temperatures from 4 to 300 K. When compared to the spectrum of the as-obtained (crude) sample the spectrum of the purified sample revealed considerable changes i.e. an increase in the EPR signal intensity and evidence of a phase transition at about 90 K. This transition is proved to be related to the two processes: freezing of the orientational motion of C60 molecules and redistribution of the positive and negative charge observed as paramagnetic centres localized on C60 molecules. |
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