Low-temperature specific heat of the graphite intercalation compounds KC/sub 8/, CsC/sub 8/, RbC/sub 8/, and their parent highly oriented pyrolytic graphite

Journal Article · Sat Nov 15 04:00:00 EST 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.4535· OSTI ID:6970885

Alexander, M G; Goshorn, D P; Onn, D G

The specific heat of the graphite intercalation compounds KC/sub 8/, CsC/sub 8/, and RbC/sub 8/ and their parent material, highly oriented pyrolytic graphite (HOPG), has been determined between 0.48 and 90 K. The results are analyzed in terms of electronic and lattice contributions. The electronic contribution to the specific heat of these compounds is enhanced by at least 29 times above that for HOPG. Comparisons are made to theoretical band-structure calculations. The lattice contribution shows deviations from a Debye model for T>5 K, which can be mathematically fitted by an Einstein specific-heat function. While our results for RbC/sub 8/ are unique, comparison with previous results for powder-based KC/sub 8/ and CsC/sub 8/ samples over a limited temperature range suggest that the type of parent graphite and/or details of preparation technique may influence the physical properties of these compounds.

• Research Organization: Department of Physics, University of Delaware, Newark, Delaware 19711
• OSTI ID: 6970885
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 22:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
BAND THEORY
CARBIDES
CARBON
CARBON COMPOUNDS
CESIUM CARBIDES
CESIUM COMPOUNDS
CLATHRATES
ELECTRONIC SPECIFIC HEAT
ELEMENTS
LATTICE VIBRATIONS
LCAO METHOD
LOW TEMPERATURE
NONMETALS
PHYSICAL PROPERTIES
POTASSIUM CARBIDES
POTASSIUM COMPOUNDS
PYROLYTIC CARBON
RUBIDIUM CARBIDES
RUBIDIUM COMPOUNDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE