Effect of In-Plane Density on the Structural and Elastic Properties of Graphite Intercalation Compounds

K. C. Woo; W. A. Kamitakahara; D. P. DiVincenzo; D. S. Robinson; H. Mertwoy; J. W. Milliken; J. E. Fischer

doi:10.1103/PhysRevLett.50.182

Effect of In-Plane Density on the Structural and Elastic Properties of Graphite Intercalation Compounds

K. C. Woo, W. A. Kamitakahara, D. P. DiVincenzo, D. S. Robinson, H. Mertwoy, J. W. Milliken, and J. E. Fischer

Phys. Rev. Lett. 50, 182 – Published 17 January 1983

Abstract

Dramatic differences in structure, elastic properties, and order-disorder temperatures are observed for stage-2 Li-graphite of different in-plane density, indicating the importance of long-range interactions in cohesive properties. Li $C_{12}$ is three-dimensionally ordered up to ∼ 500 K with $\sqrt{3} \times \sqrt{3}$ Li superlattice and $AA$ graphite stacking, whereas Li $C_{18}$ is disordered at 300 K and has $AB$ stacking. LO and LA ( $00 l$ ) phonon energies are 30% greater in the former, which can be understood in terms of electrostatic effects.

Received 21 June 1982

DOI:https://doi.org/10.1103/PhysRevLett.50.182

Authors & Affiliations

K. C. Woo

Moore School of Electrical Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104

W. A. Kamitakahara

Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011

D. P. DiVincenzo

Department of Physics and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104

D. S. Robinson

Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801

H. Mertwoy, J. W. Milliken^*, and J. E. Fischer

Moore School of Electrical Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104