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Diffusive Motion of Alkali Atoms in Graphite: A Quasielastic Neutron Scattering Study

Published online by Cambridge University Press:  15 February 2011

H. Zabel ,
A. Magerl ,
J.J. Rush  and
A.J. Dianoux
H. Zabel
Affiliation:
Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA
A. Magerl
Affiliation:
Institut Laue Langevin, 38042 Grenoble Cedex, France
J.J. Rush
Affiliation:
National Measurement Laboratory, Division 566, Washington, D.C. 20234, USA
A.J. Dianoux
Affiliation:
Institut Laue Langevin, 38042 Grenoble Cedex, France
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Abstract

We have studied the diffusive motion of alkali atoms in thermodynamic equilibrium in RbC24 by quasielastic neutron scattering. The neutron spectra show Lorentzian line profiles. The widths increase with increasing temperature. In addition a ‘de Gennes’ narrowing is observed at Q=1.2 Å-1, which coincides with the first peak in the intercalant structure factor. The narrowing becomes more pronounced at higher temperatures in contrast to a normal liquid. The data can be interpreted by the motion of clusters of alkali atoms rather than by a liquid type motion. This adds a dynamical aspect to the “floating solid’ as described by Nelson and Halperin for the melting of a 2-dimensional solid.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 289
Copyright
Copyright © Materials Research Society 1983

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References

REFERENCES

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