Local environment of Gd3+ in MgF2 |
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| Authors: | J M Gaite G R Bulka N M Hasanova N M Nizamutdinov V M Vinokurov |
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| Institution: | 1. Laboratoire de Cristallographie, U.F.R.- Faculté des Sciences, Rue de Chartres, B.P. 6759, F-45067, Orleans Cédex, France
2. Department of Mineralogy, Kazan State University, Lenin Avenue, Kazan, USSR
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| Abstract: | The electron paramagnetic resonance (EPR) of Gd3+ in MgF2 reveals that Gd3+ has two different environments in the lattice. One of them has D 2h symmetry, the EPR spectrum is characterized by a large zero field splitting B 2 0 = 968.10?4 cm?1; B 2 2 = 357.10?4 cm?1] and the fourth order term of the spin Hamiltonian is axial; it is assumed that one Gd3+ substitutes two Mg2+. The other Gd3+ center has only monoclinic symmetry. From the analysis of the fourth order term of the spin Hamiltonian of the corresponding spectrum it is seen that one Gd3+ substitutes one Mg2+ and that this substitution produces a large local distortion of the lattice. |
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