Open AccessInfluence of KF substitution on the ferroelectric phase transition of lead titanate single crystals studied by Brillouin light scattering
Author(s) -
Seonhyeop Shin,
JaeHyeon Ko,
Shinya Tsukada,
Y. Akishige,
Krystian Roleder,
Daniel Rytz
Publication year - 2015
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x15500113
Subject(s) - materials science , ferroelectricity , brillouin scattering , lead titanate , phase transition , dielectric , perovskite (structure) , softening , condensed matter physics , polarization (electrochemistry) , brillouin zone , scattering , titanate , phase (matter) , mineralogy , optics , crystallography , composite material , optoelectronics , ceramic , chemistry , physics , organic chemistry , optical fiber
The elastic properties of KF-substituted perovskite lead titanate ( PbTiO 3 ) were investigated by dielectric measurements and Brillouin light scattering. The ferroelectric phase transition occurred at substantially lower temperature due to KF substitution, which was attributed to the modification of the covalency in Pb – O and Ti – O bonds. The longitudinal acoustic (LA) mode of KF-substituted PbTiO 3 showed a frequency softening in the paraelectric phase, which was accompanied by increasing acoustic damping. This indicated that polarization fluctuations responsible for the acoustic anomalies were enhanced by KF substitution.