From char to carbon: A study of A-centers

✍ Scribed by A. Gutsze

• Book ID: 102994846
• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 370 KB
• Volume: 15
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(77)90041-0

✦ Synopsis

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 700-9OO'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.