Previous studies by Electron Spin Resonance (ESR) have established the substitution of Fe 3+ and Mg 2+ in the kaolinite structure. It is shown that Fe 2+ can substitute in kaolinite and stabilize defects which are detectable by ESR in a manner identical to Mg 2+ . The development of methods of preparing a synthetic kaolinite doped with Fe 2+ is described in detail. It is shown that the main ESR signals, which occur at g = 2.0 in natural kaolinites and which previously have been interpreted in terms of iron and magnesium, can be attributed to iron alone.
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Angel et al. (1977) studied this question.
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