Comparative Dielectric Behavior of PbFe_{1 / 2}Ta_{1 / 2}O₃ and NaNbO₃:Gd Relaxor-Like Crystals

2002/08/06 by I. P. Raevski, Raevski, I. P., S. A. Prosandeev +9
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #cond-mat.mtrl-sci

paper · pdf · doi:10.48550/arxiv.cond-mat/0208116

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

arxiv created 2002/08/06 · arxiv updated 2009/11/30

Abstract

Experimental data obtained for PbFe_{1 / 2}Ta_{1 / 2}O₃ (PFT) and NaNbO₃: 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.

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