Dependence on Temperature of the Interlayer Spacing in Carbons of Different Graphitic Perfection

Abstract

IN a previous communication¹, attention was directed to important inconsistencies and gaps in the literature concerning thermal expansion in graphitic carbons perpendicular to the hexagonal layer-planes. Preliminary experiments were reported, and, while these clarified the picture to some extent, the need for further experiments at higher (above 1,200° C.) and lower (below 20° C.) temperatures was indicated. Special diffractometer techniques required for these measurements have now been developed and will be described elsewhere : meanwhile, the extended results are reported.