Physics – Condensed Matter – Materials Science
Scientific paper
2002-08-06
Physics
Condensed Matter
Materials Science
19 pages, 8 figures, sent to J. Phys: Condens. Matter
Scientific paper
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.
Eremkin V. V.
Prosandeev S. A.
Raevski I. P.
Shuvaeva V. A.
Smotrakov V. G.
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