Comparative Dielectric Behavior of PbFe$_{1 / 2}$Ta$_{1 / 2}$O$_{3}$ and NaNbO$_{3}$:Gd Relaxor-Like Crystals

I. P. Raevski; S. A. Prosandeev; U. Waghmare; V. V. Eremkin; V. G. Smotrakov; V. A. Shuvaeva

paper

Comparative Dielectric Behavior of PbFe $_{1/2}$ Ta $_{1/2}$ O $_{3}$ and NaNbO $_{3}$ :Gd Relaxor-Like Crystals

arXiv:cond-mat/0208116

Abstract

Experimental data obtained for PbFe $_{1/2}$ Ta $_{1/2}$ O $_{3}$ (PFT) and NaNbO $_{3}$ : Gd (NaNbGd) single crystals show a diffused dielectric permittivity peak that is inherent to relaxor ferroelectrics. However some deviations from the normal relaxor properties were also observed and are under discussion. One of the key features of the relaxors is the existence of the Burns temperature, at which the polar regions appear. We found out that PFT shows this feature but the NaNbGd dielectric behavior is different. We analyse these properties within a phenomenological theory and propose a microscopic model.

19 pages, 8 figures, sent to J. Phys: Condens. Matter

Comparative Dielectric Behavior of PbFe1/2​Ta1/2​O3​ and NaNbO3​:Gd Relaxor-Like Crystals

Abstract

Comparative Dielectric Behavior of PbFe $_{1/2}$ Ta $_{1/2}$ O $_{3}$ and NaNbO $_{3}$ :Gd Relaxor-Like Crystals