Dresden 2006 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.28: Poster

Montag, 27. März 2006, 09:30–17:00, P1

Broadband dielectric spectroscopy of PSN ceramics — •Robertas Grigalaitis¹, Juras Banys¹, Algirdas Brilingas¹, Andris Sternberg², Vismants Zauls², and Karlis Bormanis² — ¹Faculty of Physics, Vilnius University, 9 Sauletekio str., 10222 Vilnius, Lithuania — ²Institute of Solid State Physic, University of Latvia, 8 Kengaraga str., 1063 Riga, Latvia

One of relaxor materials is PbSc_1/2Nb_1/2O₃ (PSN). In this material the spontaneous transition to ferroelectric phase and also the drastical change in dielectric properties due to the ordering of B’ and B" cations was observed [1]. As is known that relaxors exhibit broad frequency dispersion and huge distribution of relaxation times we have studied the dielectric properties of PSN ceramics in the frequency range from 20 Hz to 3 GHz because no data about dielectric permittivity measurements above 1 MHz was found. The obtained results show a high diffusive peak of the dielectric permittivity and behaviour typical to ferroelectric relaxors above 360 K. In order to deal about the dielectric properties and relaxation processes in PSN in more detail we calculated the relaxation time distribution in these ceramics according to the methodology adopted in [2] and compared with PMN relaxation time distribution [3].

[1] C. Malibert, B. Dkhil, J. M. Kiat, D. Durand , J. F. Berar and A. Spasojevic-deBire, J. Phys. Condens. Matter, 9 (1997), 7485-7500.

[2] J. Banys, S. Lapinskas, A. Kajokas, A. Matulis, C. Klimm, G. Völkel, and A. Klöpperpieper, Phys. Rev. B. 66 (2002), 144113.

[3] R. Grigalaitis, J. Banys, A. Kania, A. Slodczyk, J. De Physique IV, 128 (2005), 127-132.