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Electron spin resonance in carbonized organic polymers—III temperature dependence of susceptibility of non-oxidized and oxidized carbons

✍ Scribed by D. Campbell; C. Jackson; H. Marsh; Lord Wynne-Jones

Publisher
Elsevier Science
Year
1966
Tongue
English
Weight
758 KB
Volume
4
Category
Article
ISSN
0008-6223

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✦ Synopsis

Temperature dependence studies of the paramagnetic susceptibility of four series of organic polymers, heat-treated between 300" and 900°C have shown the susceptibilities to follow a Curie-Weiss law. This information was used to correct the values of unpaired electron concentrations previously reported for these series of carbonized polymers. An examination of oxidized carbons, reheated (in vacuum) to various temperatures, showed that it was possible to create new spin centres in excess of those originally present in the unoxidized material. In so far as temperature dependence is concerned these new centres aoneared to behave in a manner analogous to the original centres. Mechanisms . . of spin creation and annealing are discussed.

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