Small-angle x-ray scattering from oriented ellipsoidal voids in pyrolytic graphite

Journal Article · Mon May 01 04:00:00 EDT 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.325177· OSTI ID:7096537

Bose, S; Bragg, R H

Small-angle x-ray scattering from oriented voids in pyrolytic graphite has been studied. The scattering is found equivalent to that from a dilute dispersion of ellipsoids of revolution called ''Guinier spheres'' of radius of gyration R=(3/5) H)/sup 1/2/=(3/5)(a/sup 2/ sin/sup 2/..gamma..+b/sup 2/ cos/sup 2/..gamma..))/sup 1/2/, where ..gamma.. is the angle between the common axis of revolution (semiminor axis b) and the scattering vector h. Analysis of the data using Hamzeh and Bragg's theory provides values of a, b, and a/b from the ''Guinier'' and the ''Porod'' regions, independently, with good agreement. The theoretically predicted angular dependence of H using ''best-fit'' values of a and b is in good agreement with the experimentally determined value of H, ..gamma.. varying from 0/sup 0/ to 180/sup 0/.

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory and Department of Materials Science and Minerals Engineering, University of California, Berkeley, California 94720
• OSTI ID: 7096537
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:5; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CARBON
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
GRAPHITE
GUINIER-PRESTON ZONES
NONMETALS
PYROLYTIC CARBON
SCATTERING
VOIDS
X-RAY DIFFRACTION
ZONES