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The ferro–paraelectric phase transition of Pb 0.6 Ba 0.4 Nb 2 O 6 investigated by Raman scattering
Author(s) -
LimaSilva J. J.,
Garcia D.,
Mendes Filho J.,
Eiras J. A.,
Ayala A. P.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200302042
Subject(s) - raman spectroscopy , raman scattering , octahedron , dielectric , phonon , laser linewidth , tungsten , phase transition , materials science , phase (matter) , atmospheric temperature range , barium , oxygen , analytical chemistry (journal) , condensed matter physics , chemistry , crystallography , crystal structure , inorganic chemistry , optics , physics , thermodynamics , laser , optoelectronics , organic chemistry , chromatography , metallurgy
The temperature dependence of the vibrational modes of lead barium niobate (Pb x Ba 1– x Nb 2 O 6 ), which belongs to the tungsten‐bronze family of oxygen octahedra ferroelectrics, were investigated for the first time using the Raman scattering technique. The investigated sample ( x = 0.60) exhibits a ferro–paraelectric phase transition in the measured temperature range. Clear evidence of the structural transformation was observed in the temperature dependence of the phonon energy as well as in the linewidth and the integrated intensity of the Raman bands. The Raman bands assignment was discussed in terms of the vibrational modes of the oxygen octahedron. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)