Abstract
In order to obtain more information about the interaction between localized and conduction carrier spin centers in chars and carbons, artificial spin centers (A-centers) were made on sugar and PVDC chars as well as on P-33 carbon black using the oxidation technique developed by Antonowicz. The temperature dependence of ESR has been studied for materials heattreated in the HTT range 700–1800°C. Whereas for heattreatments 700–900°C the formation of A-centers results in a more Curie-like temperature behavior, for heattreatments of 1100°C and above the behavior does not depend on the concentration of A-centers. An explanation of this surprising result is suggested.
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