Interlayer interactions in LiC{sub 6}: Compressibility and thermal expansion

Journal Article · Wed May 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.12643· OSTI ID:286145

Zhou, P; Fischer, J E ^[1]

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1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272 (United States)

Interlayer interactions in the prototype stage-1 graphite intercalation compound LiC{sub 6} are probed by neutron diffraction measurements of {ital c}-axis compressibility {kappa}{sub {ital c}} at 300 K and {ital c}-axis thermal expansion {alpha}{sub {ital c}} in the interval 300{endash}700 K. We find a constant {kappa}{sub {ital c}}=1.43{plus_minus}0.02{times}10{sup {minus}12} cm{sup 2}/dyn for hydrostatic pressures {le} 23 kbar, about half that of graphite. In contrast, {alpha}{sub {ital c}}= 59{times}10{sup {minus}6}/K, twice that of graphite. Estimates of effective {ital c}-axis Gr{umlt u}neisen parameters show that the interlayer potential in LiC{sub 6} is in fact considerably more anharmonic than that of graphite. Measurements of {alpha}{sub {ital c}} on high temperature stage-1 solid solutions suggest even greater anharmonicity when 30{percent} of the Li sites are vacant. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016; FG02-86ER45254
• OSTI ID: 286145
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANHARMONICITY
COMPRESSIBILITY
GRUENEISEN CONSTANT
LITHIUM CARBIDES
NEUTRON DIFFRACTION
PRESSURE DEPENDENCE
THERMAL EXPANSION