Precursor dynamics in the ferroelectric phase transition of barium titanate single crystals studied by Brillouin light scattering

2011 ◽  
Vol 84 (9) ◽  
Author(s):  
Jae-Hyeon Ko ◽  
Tae Hyun Kim ◽  
K. Roleder ◽  
D. Rytz ◽  
Seiji Kojima
Keyword(s):  
Phase Transition ◽  
Light Scattering ◽  
Barium Titanate ◽  
Single Crystals ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Brillouin Light Scattering

scholarly journals Influence of KF substitution on the ferroelectric phase transition of lead titanate single crystals studied by Brillouin light scattering

2015 ◽  
Vol 05 (02) ◽  
pp. 1550011
Author(s):  
Seonhyeop Shin ◽  
Jae-Hyeon Ko ◽  
Shinya Tsukada ◽  
Yukikuni Akishige ◽  
Krystian Roleder ◽  
...  
Keyword(s):  
Phase Transition ◽  
Light Scattering ◽  
Lead Titanate ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Paraelectric Phase ◽  
Dielectric Measurements ◽  
Brillouin Light Scattering ◽  
Acoustic Damping ◽  
Lower Temperature

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.

Lattice-parameter measurements of PbHPO4 single crystals by the ratio method

1983 ◽  
Vol 16 (6) ◽  
pp. 623-628 ◽  
Author(s):  
J. Horváth
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Lattice Parameter ◽  
Ratio Method ◽  
Monoclinic Crystal System ◽  
Monoclinic Crystal ◽  
Temperature Dependences ◽  
Crystal Lattice Parameters

Temperature dependences of PbHPO4 single-crystal lattice parameters were measured by the ratio method in the range 158–421 K. Below the ferroelectric phase transition (T c = 310 K) lattice parameter b increases non-linearly with decreasing temperature while all others decrease linearly. The ratio method was generalized to the monoclinic crystal system for this purpose.

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