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Ferroelectrics Volume 369, 2008 - Issue 1
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SECTION J: RELAXORS

Broadband Dielectric Spectroscopy of Ferroelectric Phase Transitions in PbSc1/2Nb1/2O3 Ordered Ceramics

J. Macutkevic Semiconductor Physics Institute1, A. Gostauto 1, Vilnius, Lithuania
,
R. Grigalaitis Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania
,
R. Adomavicius Semiconductor Physics Institute1, A. Gostauto 1, Vilnius, Lithuania
,
A. Krotkus Semiconductor Physics Institute1, A. Gostauto 1, Vilnius, Lithuania
,
J. Banys Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania
,
G. Valusis Semiconductor Physics Institute1, A. Gostauto 1, Vilnius, Lithuania
,
K. Bormanis Institute of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga, Latvia
&
A. Sternberg Institute of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga, Latvia
 show all
Pages 185-189 | Received 06 Sep 2007, Published online: 20 Sep 2010
 
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Abstract

Broadband dielectric spectroscopy of PbSc 1/2 Nb 1/2 O 3 (PSN) ordered ceramics are reported within the range of 20 Hz ≤ ν ≤ 2 THz in 80 K ≤ T ≤ 300 K temperatures. Spectrally very broad dielectric dispersion consisting of two parts − at lower frequencies, ferroelectric domains cause a dispersion and at higher frequencies, higher temperatures the relaxation soft mode is responsible for the dispersion. The relaxation soft mode exhibit pronounced hardening on cooling, whilst the ferroelectric phase transition is connected with an abrupt freezing and rise of polar nanoregions into ferroelectric domains.

Acknowledgment

This work was supported by Lithuanian Science and Study Foundation.

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