Atomic Displacement along c-Axis and lts Temperature Dependence in 3, 5-Xylenol-Formaldehyde Resin Carbon

Abstract

Aseries of studies are being undertaken in order to clarify the variation of the layer structure in graphitization process. ln this paPer, on the 3, 5-xylenol-formaldghyde resin carbon samples heat-treated at 18000C to 3000C, themean-square displacement, ecl, and the mean-square thermal vibrational tV isplacement, li of cqrbon atems .per-pendlculqr to layer pianes Were calculated from X-ray diffraction intensities of 002, 004 and 006 reflections.
The value of u2 decreased abruptly with the decrease in co from 6.S6 A to 6.S5 A, and showed about O, 033 A2 up to 6.78 A, and then decreased again with the decrease in co(Fig.3)
The values of were in the range of O.015-O.012 A2 at 20o and increased with ambient temperature(Figs.2and 4).
The 3, 5-xylenol-formaldehydeuresin carbon was found to be less graphitizing than the petroleum coke studied previously from the variations of ce and L, with heat-treatment temperature. However the variatio:ns of with and of with ambient temperature were similaron both samples.