Polar Phonons in Relaxor Ferroelectric 0.2PSN-0.4PMN-0.4PZN

J. Macutkevič a, S. Kamba b, A. Pashkin b, J. Banys c, K. Bormanis d and A. Sternberg d a Semiconductor Physics Institute, A. Goštauto 11, Vilnius, Lithuania b Institute of Physics, ASCR, Na Slovance 2, Prague 8, Czech Republic c Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania d Institute of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga, Latvia

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Received: 26 08 2007;

Relaxor ferroelectrics 0.2PbSc1/2Nb1/2O3-0.4PbMg1/3Nb2/3O3-0.4PbZn1/3Nb2/3O3 ceramics were studied by means of the Fourier transform infrared reflection and THz transmission spectroscopy in the temperature range of 20-500 K. On heating from low temperatures, the A1 component of the strongly split TO1 mode softens towards the Burns temperature, but the softening ceases near 400 K, which could be a signature of polar cluster percolation temperature.

DOI: 10.12693/APhysPolA.113.879 PACS numbers: 78.30.-j, 63.20.-e, 71.55.Jv