Study of the Papyex structure using neutron Compton scattering

The neutron Compton scattering technique (NCS) was utilized for a precise d etermination of the randomly oriented crystallites fraction in partially or iented graphite. This was done by measuring the effective temperatures of t he C-atom along and perpendicular to the graphite planes in a sample of Pap yex and comparing the results with those obtained from a highly oriented py rolytic graphite (HOPG) sample. The half-width at half-max of the oriented fraction of crystallites (mosaic spread) was found to be (11.0 +/- 0.6)degr ees, while the randomly oriented fraction was found to be (26.2 +/- 1.6)%. (C) 2000 Elsevier Science B.V. All rights reserved.