RELATIONS BETWEEN STRUCTURAL PARAMETERS OBTAINED BY X-RAY-POWDER DIFFRACTION OF VARIOUS CARBON MATERIALS

Degree of graphitization, average interlayer spacing, and crystallite sizes were measured on various kinds of carbon materials. The relation between graphitization degree P-1 and average interlayer spacing (d) over bar(002) was found to show a downward deflection; the increase in P-1 value was retarded in comparison with the approach of the (d) over bar(002) value to 0.3354 nm. The deflection depended strongly on the texture of carbon samples in the nanometric scare. The existence of structural strain in carbon materials had a stronger effect on the relation to (d) over bar(002) than that to P-1. This is the reason why the relation between P-1 and (d) over bar(002) shows the downward deflection.