PROPERTIES OF BUCKYTUBES AND DERIVATIVES

The structural, magnetic, and transport properties of bundles of bucky tubes (buckybundles) have been studied. High-resolution electron micro scopy (HREM) images have revealed the detailed structural properties a nd the growth pattern of buckytubes and their derivatives. The magneti c susceptibility of a bulk sample of buckybundles is -10.75 x 10(-6) e mu/g for the magnetic field parallel to the bundle axes, which is appr oximately 1.1 times the perpendicular value and 30 times larger than t hat of C-60. The magnetoresistance (MR) and Hall coefficient measureme nts on the buckybundles show a negative MR at low temperature and a po sitive MR at a temperature above 60 K and a nearly linear increase in conductivity with temperature. The results show that a buckybundle may best be described as a semimetal. Using a stable glow discharge, buck ybundles with remarkably large diameters (up to 200 mu m) have been sy nthesized. These bundles are evenly spaced, parallel, and occupy the e ntire central region of a deposited rod. HREM images revealed higher y ield and improved quality buckytubes produced by this technique compar ed to those produced by a conventional are discharge.