The diamagnetic susceptibilities of some pyrolytic graphites deposited at 2100-2300^∘{}C have been measured at room temperature. As-deposited samples had significantly larger susceptibilities than that of well-graphitized carbons or single-crystal graphite. Heat treatment at temperatures above 2300^∘{}C caused the total susceptibility to decrease to a minimum value, then rise and level out at a value characteristic of graphite, as a function of treatment temperature. The relationship of the susceptibility behavior to the structure of the pyrolytic graphite is discussed.
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D. B. Fischbach (1961) studied this question.
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