X-ray study of intercalate order-disorder transition in C/sub 24/K

Journal Article · Mon Dec 31 04:00:00 EST 1979 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.43.2022· OSTI ID:5741466

Zabel, H; Moss, S C; Caswell, N; Solin, S A

Below T/sub c/=122.9 /sup 0/K, C/sub 24/K shows a transition from the intralayer disordered state to an ordered state. For T>T/sub c/, present diffuse scattering data from the potassium intercalate in graphite indicate a two-dimensional (2-D) character of the short-range order. As this 2-D scattering increases with decreasing temperature, hk0 superlattice reflections appear at T/sub c/ which have a true 3-D character that results from essentially simultaneous intralayer and interlayer ordering. This long-range order vanishes as vertical-bar T-T/sub c/ vertical-bar /sup ..beta../ with ..beta..=0.180 +- 0.01.

• Research Organization: Department of Physics, University of Houston, Houston, Texas 77004
• OSTI ID: 5741466
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 43:27; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
CARBON
CLATHRATES
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
GRAPHITE
LOW TEMPERATURE
NONMETALS
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
POTASSIUM COMPOUNDS
POWDERS
SCATTERING
SUPERLATTICES
X-RAY DIFFRACTION