On the Diamagnetic Susceptibilities of Carbons.

Abstract

The reason for the large diamagnetic anisotropy of graphite can be attributed to the circulation of the π-electrons in the network planes of carbon atoms under the magnetic field. It can be assumed that the diamagnetic anisotropies of the carbonized materials increase with increasing the aromatic condensation, in cosequence, the mass susceptibilities do. Therefore, the magnetic susceptibility can be used for the measure of the degree of the carbonization or of the graphitization.
The magnetic susceptibilities of the commercial carbon blacks and carbon brushes were measured, and the results are shown in Table 1 and 2, respectively . The increase in the magnetic susceptibility by the heat treatment were observed for soot and pitch cokes, the results are shown in Fig. 1.