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Electron spin resonance studies of doped synthetic kaolinite. I

Published online by Cambridge University Press:  09 July 2018

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

Synthetic kaolinites of varying crystallinity, and in some instances with ideal morphology, have been produced by hydrothermal reaction of aluminiosilicate gels. Synthetic kaolinites doped with Mg2+ and Fe3+ were also obtained.

Synthetic kaolinite doped with Fe3+ produced an ESR spectrum at g = 4 identical to spectra observed in natural kaolinites. Following X-irradiation and annealing at ~200°C, synthetic kaolinite doped with Mg2+ exhibited an ESR signal at g = 2·0 identical to a resonance observed in natural kaolinites. It is concluded that the g = 2·0 signal in kaolinite is due to a defect centre stabilized by Mg2+ substitution.

All synthetic and natural kaolinites exhibit an additional resonance at g = 2·0 following X-irradiation which can be repeatedly created and destroyed by irradiation and annealing. This resonance is attributed to defects possibly associated either with the substitution of Al3+ for Si4+ in kaolinite or with lattice vacancies.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 247 - 255
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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References

Aasa, R., Malmstrom, B.G., Saltman, P. & Vanngard, T. (1963) Biochim. Biophys. Acta, 75, 203.Google Scholar
Angel, B.R. & Hall, P.L. (1972) Proc. Int. Clay Conf. Madrid, p. 47.Google Scholar
Arjona, A.M. & Fripiat, J.J. (1967) Trans. Faraday Soc. 63, 2936.CrossRefGoogle Scholar
Boesman, E. & Schoemaker, D. (1961) Compt. Rend. Acad. Sci. 252, 1931.Google Scholar
Cairns-Smith, A.J. (1966) J. Theoret. Biol. 10, 53.Google Scholar
Castner, T., Newell, G.S., Holton, W.C. & Slichter, C.P. (1960) J. Chem. Phys. 32, 668.Google Scholar
Earley, J.W. (1953) Am. Miner. 38, 707.Google Scholar
Friedlander, H.Z., Frink, C.R. & Saldick, J. (1963) Nature, 199, 61.Google Scholar
Griffith, J.S. (1964) Mol. Phys. 8, 213.CrossRefGoogle Scholar
Griffiths, J.H.E., Owen, J. & Ward, I.M. (1955) Kept. 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. Geol. 13, 97.CrossRefGoogle Scholar
Hinckley, D.N. (1961) Tech. Rep. Mineral Industries Experiment Station. College of Mineral Industries, Pennsylvania State University.Google Scholar
Hoffman, U., Boehm, H.P. & Gromes, W. (1961) Z. Anog. Allgem. Chem. 308, 143.Google Scholar
Hogg, C.S., Jepson, W.B. & Rowse, B. (1973) Joint meeting of the Mineralogical Society and the British Ceramic Society, Dec. 1973. (Proceedings unpublished).Google Scholar
Kemp, R.C. (1972) J. Phys. C 5, 3566.Google Scholar
Kemp, R.C. (1973) Phys. Stat. Sol. (b) 57, K79.Google Scholar
Lee, S. & Bray, P.J. (1962) Phys. Chem. Glasses, 3, 37.Google Scholar
Leonard, A., Suzuki, S., Fripiat, J.J. & De Kimpe, C. (1964) J. Phys. Chem. 68, 2608.Google Scholar
Malden, P.J. & Meads, R.E. (1967) Nature, 215, 844.CrossRefGoogle Scholar
Robertson, R.H.S., Brindley, G.H. & Mackenzie, R.C. (1954) Am. Miner. 39, 118.Google Scholar
Schofield, R.K. & Sampson, H.R. (1954) Discuss. Faraday Soc. 18, 135.CrossRefGoogle Scholar
Van Keymeulen, J. & Dekeyser, W. (1957) J. Chem. Phys. 27, 172.Google Scholar
Wauchope, R.D. & Haque, R. (1971) Nature Phys. Sci. 233, 141.Google Scholar
Wertz, J.E., Orton, J.W. & Auzins, P. (1961) Discuss. Faraday Soc. 31, 140.CrossRefGoogle Scholar
Wickman, H.H., Klein, M.P. & Shirley, D.A. (1965) J. Chem. Phys. 42, 2113.CrossRefGoogle Scholar
Worrall, W.E. & Cooper, N.E. (1966) Clay Miner. 6, 341.Google Scholar