Ferroelectricity

Gd$^{3+}$–F$^-$ dimer centers in the ferroelectric lead germanate

V. A. Vazhenin, A. N. Ivachev, A. P. Potapov, M. Yu. Artemov

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

Abstract: The Gd$^{3+}$ centers formed in lead germanate doped with fluorine have been studied using electron paramagnetic resonance. The parameters of the triclinic spin Hamiltonian are found at room temperature. The center is shown to be a gadolinium ion having the nearest environment in which the fluorine ion is substituted for the oxygen ion. The Gd–F dimer binding energy relative to the energy of a single gadolinium ion is determined. The interaction of the dimer center with the spontaneous polarization is lower than the measurement error.

Received: 16.03.2011
Accepted: 31.03.2011

 English version: Physics of the Solid State, 2011, 53:10, 2085–2090

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