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Phonon Dispersion of Transverse Basal Plane Modes in Alkali-Graphite Compounds

Published online by Cambridge University Press:  15 February 2011

W. A. Kamitakahara ,
H. Zabel  and
R. M. Nicklow
W. A. Kamitakahara
Affiliation:
Ames Laboratory-USDOE and Dept. of Physics, Iowa State University, Ames, Iowa 50011, USA
H. Zabel
Affiliation:
Dept. of Physics, University of Illinois, Urbana, Illinois 61801, USA
R. M. Nicklow
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
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Abstract

Dispersion curves for low-frequency transverse modes propagating in the basal plane have been measured in the compounds KC8, KC24 and RbC24 by means of neutron inelastic scattering. The acoustic branches show at low q a behavior ω2= Aq2+Bq4 characteristic of layered materials. The optical branches are derived qualitatively from graphite-like optical branches hybridized with new alkali-like branches. In stage 2 compounds, the shear constant C44, which can be obtained by extrapolating the acoustic branch towards q=0, is appreciably smaller than in stage-1 compounds or in pure graphite. At low temperatures, it was noted in KC24 that a frequency gap in the acoustic branch opens up near q=0.6 A-1, corresponding to the Brillouin zone boundary of the low temperature alkali superstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 311
Copyright
Copyright © Materials Research Society 1983

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References

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