Eur. Phys. J. B 35, 371-375 (2003)
DOI: 10.1140/epjb/e2003-00289-9

Study by X-ray diffraction and Raman spectroscopy of a Dy@C single crystal

T. Wågberg^{1, 2}, P. Launois², R. Moret², H.J. Huang³, S.H. Yang³, I.L. Li⁴ and Z.K. Tang<sup>4

1</sup>  Department of Physics, Umeå University, 901 87 Umeå, Sweden
²  Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France
³  Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Hong-Kong, P.R. China
⁴  Department of Physics, and Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Clear Water Bay, Hong-Kong, P.R. China

moret@lps.u-psud.fr

(Received 15 May 2003 / Received in final form 29 August 2003 Published online 15 October 2003)

Abstract
We report the first X-ray diffraction and Raman spectroscopy study of a single crystal of the rare-earth endohedral fullerene Dy@C ₈₂. The lattice is found to be body-centered cubic ( a = 25.79 Å, space group which is at variance with previous reports and confirms that several types of structures can be stabilized in Dy@C ₈₂. X-ray diffraction/diffuse scattering methods reveal no low-temperature change down to 12 K for the present structure. The Raman spectroscopy data are comparable to those of other M@C ₈₂ endohedral compounds. However, the Dy oxidation state and the force constant of the low-frequency metal-cage stretching mode do not follow the simple relationship observed before.

PACS
61.10.Nz - X-ray diffraction.
61.48.+c - Fullerenes and fullerene-related materials.
78.30.Na - Fullerenes and related materials .

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003

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