Localization of Fe3+ impurities in kyanite by EPR

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 do...

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Bibliographic Details
Published in:Applied magnetic resonance 2001-08, Vol.21 (1), p.39-48
Main Authors: Gaite, J. M., Rager, H., Dusausoy, Y.
Format: Article
Language:English
Subjects:
Electron paramagnetic resonance
Kyanite
Order parameters
Resonance lines
Single crystals
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Summary: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.
ISSN:0937-9347
1613-7507
DOI:10.1007/BF03162438