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Thermal Expansion of Graphite and HNO3-Graphite Intercalation Compounds, a Neutron Diffraction Study

Published online by Cambridge University Press:  21 February 2011

Haim Pinto ,
Mordechai Melamud  and
Hagai Shaked
Haim Pinto
Affiliation:
Physics Department, Nuclear Research Centre - Negev, P.O. Box 9001, 84190 Beer-Sheva, Israel
Mordechai Melamud
Affiliation:
Physics Department, Nuclear Research Centre - Negev, P.O. Box 9001, 84190 Beer-Sheva, Israel
Hagai Shaked
Affiliation:
Physics Department, Nuclear Research Centre - Negev, P.O. Box 9001, 84190 Beer-Sheva, Israel Physics Department, Ben-Gurion University of the Negev, P.O. Box 653, 84120 Beer-Sheva, Israel
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Abstract

The temperature dependent lattice parameter, c(T), was determined for samples of graphite, and HNO3 -graphite intercalates stage 3 and stage 4, using neutron diffraction. The temperature range studied is 12 to 300 K. The stage 3 and stage 4 intercalates exhibit a strong two-step discontinuity at the temperature of their structural phase transition (≈260 K). A stage-independent, temperature-dependent lattice parameter for the intercalant layer is extracted from the observed lattice parameters for graphite, stage 3, and stage 4 intercalates. The graphite and the intercalant lattice parameters are calculated using one-dimensional Debye theory in the framework of the Grüneisen relation. The Debye temperatures that yield best fits to the observed lattice parameters of the graphite and the intercalant are 500 K and 421 K, respectively. Using these values, thermal expansion coefficients for graphite, the intercalates and the intercalant are derived.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 385
Copyright
Copyright © Materials Research Society 1990

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References

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