Abstract
The light depolarization and the Raman scattering spectrum were measured in a KTa1−xNbxO3 crystal with a dilute Nb concentration (1.2%). Measurements were performed on cooling to 10 K without and then with an electric field. The unexpected Raman lines detected well above TC are attributed to one-phonon density of states. The dependence of these lines as functions of temperature and electric field reveals the formation of polar clusters which grow in the paraelectric phase on cooling and some peculiarities in the mechanism of the phase transition. Copyright © 2005 John Wiley & Sons, Ltd.
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