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Raman scattering investigation of the central peak in lead lanthanum zirconate—titanate‐x/95/5 ceramics with × = 0—4 mol% of La 2 O 3
Author(s) -
ElHarrad I.,
Becker P.,
CarabatosNédelec C.,
Handerek J.,
Ujma Z.,
Dmytrow D.
Publication year - 1995
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.1250261205
Subject(s) - raman spectroscopy , raman scattering , dielectric , ferroelectricity , curie temperature , ferroelectric ceramics , polarization (electrochemistry) , lead zirconate titanate , analytical chemistry (journal) , lanthanum , materials science , activation energy , ceramic , lead titanate , nuclear magnetic resonance , condensed matter physics , chemistry , inorganic chemistry , optics , physics , optoelectronics , chromatography , ferromagnetism , composite material
Abstract It is demonstrated that in the ferroelectric phase of the PLZT‐x/95/5 ceramics the spontaneous polarization is the order parameter, the fluctuations of which are mainly responsible for the dielectric relaxations manifested in the Raman spectra by the appearance and the evolution of a central peak. For T >315°C, in the paraelectric phase, the spontaneous polarization fluctuations are substituted by the fluctuations of the appearing local concentration polarization. Above the Curie temperature, the thermally activated relaxation process gives an activation energy of 0.7 eV.