Terahertz Spectroscopy of Ordered PbSc1/2Nb1/2O3 Ceramics

J. Macutkevič a, R. Adomavičius a, A. Krotkus a, G. Valušis a, R. Grigalaitis b, J. Banys b, K. Bormanis c and A. Sternberg c a Semiconductor Physics Institute, A. Gostauto 11, Vilnius, Lithuania b Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania c Institute of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga, Latvia

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Received: 26 08 2007;

The ordered PbSc1/2Nb1/2O3 ceramics were studied by THz transmission spectroscopy in the temperature range of 80-300 K. Below ferroelectric phase transition temperature the strength of central mode gradually decreases and gives evidence for a mixed displacive and order-disorder character of the transitions. Ferroelectric phase transition is connected with an abrupt freezing and rise of polar nanoregions into ferroelectric domains.

DOI: 10.12693/APhysPolA.113.883 PACS numbers: 77.22.Gm, 77.80.-e, 77.80.Bh