Synthetic Kaolinites Doped with Fe2+ and Fe3+ Ions

B. R. Angel, A. H. Cuttler, K. S. Richards and W. E. J. Vincent
Department of Mathematical Sciences, Plymouth Polytechnic, Plymouth, Devon, England

Abstract: Previous studies by Electron Spin Resonance (ESR) have established the substitution of Fe3+ and Mg2+ in the kaolinite structure. It is shown that Fe2+ can substitute in kaolinite and stabilize defects which are detectable by ESR in a manner identical to Mg2+. The development of methods of preparing a synthetic kaolinite doped with Fe2+ 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.

Clays and Clay Minerals; December 1977 v. 25; no. 6; p. 381-383; DOI: 10.1346/CCMN.1977.0250602
© 1977, The Clay Minerals Society
Clay Minerals Society (www.clays.org)