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Phase transition in dilute KTN crystal investigated by Raman scattering measurements
Author(s) -
Bouziane E.,
Fontana M. D.,
Ayadi M.
Publication year - 2005
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1374
Subject(s) - raman spectroscopy , raman scattering , electric field , phase transition , dielectric , phonon , crystal (programming language) , condensed matter physics , phase (matter) , polar , depolarization , chemistry , materials science , molecular physics , optics , optoelectronics , physics , medicine , organic chemistry , quantum mechanics , astronomy , endocrinology , computer science , programming language
Abstract The light depolarization and the Raman scattering spectrum were measured in a KTa 1− x Nb x O 3 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 T C 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.