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Localisation of Fe 3+ impurities in kyanite by EPR.

Abstract : An electron paramagnetic resonance (EPR) study of Fe3+ centers in kyanite AlSi2O5 has been performed on a natural blue single crystal at 34.40 GHz. Three Fe3+ centers have been observed. One of them, arising from 10% of the Fe3+ amount, presents weak signals and few resonance lines inside Kramers doublets, the weakness of the signals and the high value of the zero-field splitting between Kramers doublets allow only the determination of the second-order parameters of the spin Hamiltonian. For the two other centers all second- and fourth-order parameters are determined. The comparison of the pseudo-symmetries of the fourth-order parameters between EPR results and crystal field calculation does not allow one to define the location of all Fe3+ centers at Al octahedra. It is proved that Fe3+ is partly located at Al1 position (25%). For the other observed centers it was not possible to define their location in the structure. This study is a good example of the limitation of the pseudo-symmetry method.
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https://hal-insu.archives-ouvertes.fr/hal-00072382
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, May 24, 2006 - 9:33:12 AM
Last modification on : Friday, April 5, 2019 - 8:08:23 PM

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  • HAL Id : hal-00072382, version 1

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Jean-Michel Gaite, H. Rager, Y. Dusausoy. Localisation of Fe 3+ impurities in kyanite by EPR.. Applied Magnetic Resonance, Springer Verlag, 2002, 21, pp.39-48. ⟨hal-00072382⟩

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