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Electron spin resonance studies of doped synthetic kaolinite. II

Published online by Cambridge University Press:  09 July 2018

J. P. E. Jones ,
B. R. Angel  and
Peter L. Hall
J. P. E. Jones
Affiliation:
School of Mathematical Sciences, Plymouth Polytechnic, Plymouth PL4 8AA, Devon
B. R. Angel
Affiliation:
School of Mathematical Sciences, Plymouth Polytechnic, Plymouth PL4 8AA, Devon
Peter L. Hall
Affiliation:
School of Mathematical Sciences, Plymouth Polytechnic, Plymouth PL4 8AA, Devon
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Abstract

It is shown from studies of synthetic kaolinites doped with Fe3+ that the ESR spectrum of kaolinite at g = 4 consists of two components attributed to Fe3+ ions occupying two distinct substitutional sites (Centres I and II). The relative intensity of the two components can be correlated with the X-ray crystallinity of the samples. The ESR spectrum is influenced by artificial changes in crystallinity produced by subjecting samples to high stresses or by intercalation. It is concluded that Centre II is due to Fe3+ replacing Al3+ in the octahedral layer in a region of high crystallinity. Centre I is assigned to Fe3+ occupying Al3+ sites distorted by changes in the hydroxyl orientations associated with layer stacking disorder or disruption of interlayer bonding.

A stable defect centre in kaolinite which produces an ESR spectrum at g = 2·0 is attributed to either a hole centre located on an Si—O bond adjacent to an Mg2+ octahedral impurity or to an O2− ion trapped within the lattice.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 257 - 270
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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References

Angel, B.R. & Hall, P.L. (1972) Proc. Int. Clay Conf. Madrid, p. 47.Google Scholar
Atkins, P.W. & Symons, M.C.R. (1967) The Structure of Inorganic Radials. Elsevier, Amsterdam.Google Scholar
Blumberg, W.E. (1967) Magnetic Resonance in Biological Systems (Ed. by Ehrenberg A. and Vanngard T.), p. 119. Pergamon, London.Google Scholar
Boesman, E. & Schoemaker, D. (1961) Compt. Rend. Acad. Sci. 252, 1931.Google Scholar
Brindley, G.W. & Nakahira, M. (1959) J. Amer. ceram. Soc. 42, 311.Google Scholar
Cox, R.T. (1971) Solid St. Commuti. 9, 1989.Google Scholar
Dowsing, R.D. & Gibson, J.F. (1969) J. chem. Phys. 50, 294.Google Scholar
Giese, R.F. Jr. & Dati, A.P. (1973) Am. Miner. 58, 471.Google Scholar
Griffith, J.S. (1964) Mol. Phys. 8, 213.CrossRefGoogle Scholar
Griffiths, J.H.E., Owen, J. & Ward, I.M. (1955) Rep. Conf. Defects in Cryst. Solids, Bristol Phys. Soc, p. 81.Google Scholar
Hall, P.L. (1973) Ph.D. thesis, University of London.Google Scholar
Hall, P.L., Angel, B.R. & Braven, J. (1974) Chem. Geo!. 13, 97.Google Scholar
Hall, P.L., Angel, B.R. & Jones, J.P.E. (1974) J. Magnetic Resonance (in press)Google Scholar
Henderson, B. & Wertz, J.E. (1968) Adi: Phys. 17, 749.Google Scholar
Hinckley, D.N. (1961) Tech. Rep. Mineral. Industries Experiment Station, College of Mineral Industries, Pennsulvania State University.Google Scholar
Ioffe, V.A. & Yanchevskaya, I.S. (1967) Opt. Spectrosk, 23, 494.Google Scholar
Kanzig, W. & Cohen, M.H. (1959) Phys. Rev. Letts, 3, 509.Google Scholar
Kasai, P.H. (1965) J. chem. Phys. 43, 3322.Google Scholar
Ledoux, R. & White, J.L. (1964) Science, 143, 244.Google Scholar
Marfunin, A.S. & Bershov, L.V. (1970) Idei. E.S. Fedorova Sovrem. Kristall. Mineral. Leningrad, p. 186.Google Scholar
Noble, F.R. (1971) Clay Miner. 9, 71.Google Scholar
Novozhilov, A.I., Samilovich, M.E., Sergeev-Bobr, A.A. & Anikin, I.N. (1969) Zh. Strukt. Khim. 10, 450.Google Scholar
Olejnik, S., Aylmore, S., Posner, A.M. & Quirck, J.P. (1968) J. Phys. Chem. 72, 241.Google Scholar
Pott, G.T. & Mcnicol, B.D. (1972) J. chem. Phys. 56, 5246.CrossRefGoogle Scholar
Searl, R.C., Smith, R.C. & Wyard, S.J. (1961) Proc. phys. Soc. 78, 1174.Google Scholar
Sharma, R.R., Das, T.P. & Orbach, R. (1966) Phys. Rev. 149, 257.Google Scholar
Symons, M.R.C. (1972) J. phys. Chem. 76, 3095.Google Scholar
Vedrine, J.C. (1973) J. Catalysis, 29, 120.Google Scholar
Wauchope, R.D. & Haque, R. (1971) Nature Phys. Sci. 233, 141.Google Scholar
Weiss, A., Orth, H. & Thielepope, W.L. (1966) Proc. Int. Clay Conf. Jerusalem, 1, 277.Google Scholar
Wickman, H.H., Klein, M.P. & Shirley, D.A. (1965) J.chem. Phys. 42, 2113.Google Scholar