Mössbauer studies related to the solid-state dynamics of C60
| Autor: | R. H. Herber, Israel Felner, E. R. Bauminger |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Materials science
media_common.quotation_subject Isotropy Analytical chemistry General Physics and Astronomy Maleic anhydride Quadrupole splitting Asymmetry Metal chemistry.chemical_compound Nuclear magnetic resonance Buckminsterfullerene chemistry Lattice (order) visual_art Mössbauer spectroscopy visual_art.visual_art_medium media_common |
| Zdroj: | Il Nuovo Cimento D. 18:227-230 |
| ISSN: | 1826-9893 0392-6737 |
| DOI: | 10.1007/bf02458895 |
| Popis: | C60 (Buckminsterfullerene) is isolated from organic solvents above 260 K as an f.c.c. solid with complete orientational disorder. The rotational dynamics are diffuse and isotropic, with a short (12 ps) correlation time at 300 K. Below 260 K, the solid forms in a simple cubic lattice with Pa3 symmetry. The librational motion occurs by activated jumps with a correlation time of about 60 ns at 200 K. To gain further insight into the dynamics of C60, the compound C60Fe(CO)4 (I) (generously made available to us by A. Stephens and M. Green of Oxford University) has been studied by 57Fe Mossbauer spectroscopy. As expected, the resonance at 90 K consists of a doublet with an isomer shift (relative to metallic iron) of 0.034(1) mm s−1 and a quadrupole splitting of 1.607(5) mm s−1. There is no significant temperature-dependent, intensity asymmetry of the doublet. The temperature dependence of the effect magnitude is well fit by a linear regression over the range 85 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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