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Specific Heat Anomaly of C24K Arising from Hydrogen Physisorption

Published online by Cambridge University Press:  15 February 2011

Tauotsu Kondow  and
Uichiro Mizutani
Tauotsu Kondow
Affiliation:
Department of Chemistry, Faculty of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
Uichiro Mizutani
Affiliation:
Department of Applied Physics, Faculty of Engineering, Nagoya University, Chikusa-ku, Nagoya 464, Japan
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Abstract

Hydrogen/deuterium gas was absorbed in the potassium graphite intercalation compound, C24K, at 77K and then the low temperature specific heats were measured in situ as a function of the hydrogen concentration in the temperature range 1.5–6K. Enhancement of the electronic specific heats upon hydrogen sorption indicates formation of bound states in the vicinity of the Fermi level. Increase of the Debye temperatures by introduction of hydrogen shows the hardening of the lattice. An observed specific heat anomaly was ascribed to a dispersion-less optical phonon with characteristic temperatures of about 17K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 347
Copyright
Copyright © Materials Research Society 1983

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References

REFERENCES

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