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

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Macutkevič J., Kamba S., Pashkin A., Banys J., Bormanis K., Sternberg A.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 3
879-882
EN
Relaxor ferroelectrics 0.2PbSc_{1/2}Nb_{1/2}O_3-0.4PbMg_{1/3}Nb_{2/3}O_3-0.4PbZn_{1/3}Nb_{2/3}O_3 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 A_1 component of the strongly split TO_1 mode softens towards the Burns temperature, but the softening ceases near 400 K, which could be a signature of polar cluster percolation temperature.
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