DIAMAGNETISM OF SOME QUASI-2-DIMENSIONAL GRAPHITES AND MULTIWALL CARBON NANOTUBES

The diamagnetic susceptibility (DMS) of quasi-two-dimensional graphite s (QTDGs) and multiwall carbon nanotubes (MWCNs) was measured at 4-950 K. The DMS of these carbons was explained by means of the band model of QTDG. The high average DMS value of QTDGs and MWCNs is associated w ith DMS normal to graphene sheets: the orbital diamagnetism of 2D cond uction carriers. The DMS values along the sheets and nanotubes axes ar e close to the atomic one, i.e. they are 2 orders of magnitude less th an those normal to the sheets and to MWCNs axes. (C) 1997 Elsevier Sci ence B.V.