Diamagnetism of Boron and Iodine-Chrolide Compounds of Graphite

Abstract
Magnetic susceptibilities of compression annealed pyrolytic graphite intercalated with iodine monochloride (ICl) and of pyrolytic carbon substitutionally doped with boron (B) have been measured between 77 K and 300 K as functions of temperature and impurity concentration. The results are discussed in terms of McClure's theory based on the Slonczewski-Weiss band model. A numerical computation of the carrier concentration has led to an evaluation of the hole production rate of impurities; 67% for B and 5% for ICl. The low hole production rate of ICl seems to be ascribed to the clustering of intercalants taking place between carbon layers.

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