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Mössbauer effect study on the mixed valence state of iron in tourmaline

Published online by Cambridge University Press:  05 July 2018

E. A. Ferrow ,
H. Annersten  and
R. P. Gunawardane
E. A. Ferrow
Affiliation:
Department of Mineralogy and Petrology, University of Lund, Sölvegatan 13, S-222 62 Lund, Sweden
H. Annersten
Affiliation:
Department of Mineralogy and Petrology, University of Uppsala, Box 555, S-751 22 Uppsala, Sweden
R. P. Gunawardane
Affiliation:
Department of Chemistry, University of Paradeniya, Paradeniya, Sri Lanka
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Abstract

Mössbauer spectra of iron-bearing tourmaline, obtained at different temperatures, show the existence of thermally-activated charge delocalization among clusters of iron atoms situated in the Y and Z octahedra of the tourmaline structure. The temperature dependence indicates an unusually high activation energy for the delocalization process which suggests that the process takes place between crystallographically non-equivalent sites. Annealing of the tourmaline in hydrogen is observed to inhibit the delocalization process, thus localizing the electron into the Z-site.

Keywords

Mössbauer effecttourmalineironcharge delocalizationSwedenH2 annealing
Type
Mineralogy
Information
Mineralogical Magazine , Volume 52 , Issue 365 , April 1988 , pp. 221 - 228
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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References

Amthauer, G. and Rossman, R.G. (1984) Mixed valence state of iron in minerals with cation cluster. Phys. Chem. Minerals 11, 37-51.CrossRefGoogle Scholar
Annersten, H., Ericsson, T. and Filippidis, A. (1982) Cation ordering in Ni-Fe olivines. Am. Mineral. 67, 1212-7.Google Scholar
Barton, R. Jr. (1969) Refinement of the crystal structure of buergerite and the absolute orientation of tourmaline. Acta Crystallogr. 25, 1523-33.Google Scholar
Burns, R.G. (1972) Mixed valencies and site occupancies of iron in silicate minerals from Mrssbauer spectroscopy. Can. J. Spectroscopy 17, 251-9.Google Scholar
Donnay, G. and Barton, R. Jr. (1972) Refinement of the crystal structure of elbaite and the mechanism of tourmaline solid solution. Tchermaks. Mineral. Petrpg. Mitt. 18, 273-86.Google Scholar
Donnay, G. and Barton, R. Jr. and Buerger, M.J. (1950) The determination of the crystal structure of tourmaline. Acta Crystallogr. 3, 379-88.CrossRefGoogle Scholar
Fortier, S. and Donnay, G. (1975) Schorl refinement showing composition dependence of the tourmaline structure. Can. Mineral. 13, 173-7.Google Scholar
Hermon, E., Simkin, D.J., Donnay, G. and Muir, W.B. (1973) The distribution of Fe2+ and Fe3+ in the iron-bearing tourmaline: A Mrssbauer study. Tchermaks Mineral. Petrog. Mitt. 19, 124-32.CrossRefGoogle Scholar
Iijima, S., Cowley, J.M. and Donnay, G. (1973) High resolution electron microscopy of tourmaline crystals. Ibid. 20,216-24.Google Scholar
Korovushkin, V.V., Kuzmin, V.I. andBelov, V.F. (1979) Mrssbauer studies of structural features in tourmaline of various genesis. Phys. Chem. Minerals 4, 209-20.CrossRefGoogle Scholar
Lotgering, F.K. and van Diepen, A.M. (1977) Electron exchange between z+ and Fe3+ on octahedral sites in spinels studied by means of paramagnetic and Mrssbauer spectra and susceptibility measurements. J. Phys. Chem. Solids 38, 565-72.CrossRefGoogle Scholar
Mattson, S.M. and Rossman, G.R. (1984) Ferric iron in tourmaline. Phys. Chem. Minerals 11, 225-34.CrossRefGoogle Scholar
Mattson, S.M. and Rossman, G.R. (1987) Fe2+-Fe3+ interaction in tourmaline. Ibid. 14,163-71.Google Scholar
Nolet, D.A. and Burns, R.G. (1979) A study of the temperature-dependent electron delocalization by the Mrssbauer Effect. Ibid. 4,221-34.Google Scholar
Saegusa, N., Price, D.C. and Smith, G. (1978) Analysis of the Mrssbauer spectra of several iron-rich tourmalines. International conference on the application of the MOssbauer effect. Kyoto, Japan.Google Scholar
Smith, G. (1978) A reassesment of the role of iron in the 5000-30 000 cm-1 region of the electron absorption of tourmaline. Phys. Chem. Minerals 3, 343-73.CrossRefGoogle Scholar