Abstract
Kaolinite exhibits two principal ESR resonances centred at g∼4 and g∼2. Following heat treatment at 500°C, the low-field resonance collapses with a simultaneous increase in intensity of the central line. Similar results were obtained from dry-ground kaolinite and this change is attributed partly to oxidation of Fe 2+. X-irradiation resulted in new paramagnetic species on the clay surfaces and a corresponding intense signal at g=2, while treatment with solutions of a strong acid and a strong base produced no significant change in the spectrum.
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