Structural and Magnetic Characterisation of Ce@C82 |
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| Authors: | Christopher John Nuttall Yasuhira Inada Yoshihiro Watanabe Kiyoe Nagai Tsunehiro Muro Dam Hieu Chi |
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| Institution: | Japan Advanced Institute of Science and Technology , Tatsunokuchi, Ishikawa , 923-1292 , Japan |
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| Abstract: | Abstract We report the structural and magnetic properties of the endohedral metallofullerene Ce@C82. A hexagonal close packing phase P63/mmc a=11.1544Å, c=18.2256Å] is formed exclusively after vacuum annealing of the solvent precipitated compound. In contrast, sublimed Ce@C82 was found to be dominantly face-centred cubic close packed Fm-3m; a=15.766Å]. X-ray powder profile calculations revealed that the endohedral cerium atom lies close to 1.8Å from the C82 cage centre in both phases. Hexagonal Ce@C82 has been investigated by magnetic susceptibility measurements. Paramagnetic behaviour is maintained down to 2K attributable to Ce3+ ions. Towards lower temperatures, the observed paramagnetic moment falls from the free ion Ce3+(μeff =2.54μB) value, monotonically approaching 1μB at 2K. |
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| Keywords: | endohedral metallofullerene Ce@C82 polymorphism magnetism |
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