Ferroelectricity

Gd$^{3+}$ EPR in solid solutions based on ferroelectric lead germanate

V. A. Vazhenin, A. P. Potapov, M. Yu. Artemov, V. B. Guseva, A. V. Fokin

Ural Federal University Scientific Research Institute of Physics and Applied Mathematics, Ekaterinburg

Abstract: The splitting of the ERP spectrum of a single Gd$^{3+}$ ion into four intense components has been observed in crystals of Pb$_5$(Ge$_{1-x}$Si$_x$)$_3$O$_{11}$ solid solutions, which is caused by the appearance of silicon ions in three nearest germanium spheres. The atomic structure of the observed centers has been determined. The conclusion has been made that silicon mainly substitutes for germanium in oxygen tetrahedra and for one of germanuim atoms in oxygen bitetrahedra, which is based on comparison of the measured ratio of component intensities with the results of the calculation of the concentrations of Gd$^{3+}$ associations with silicon ions.

Received: 18.04.2011

 English version: Physics of the Solid State, 2011, 53:11, 2305–2310

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