Relaxation and phase-transition characteristics of relaxor ferroelectric potassium lithium niobate

Powders of lithium niobate-tantalate across the full compositional range have been made and crystals grown using a lithium vanadate flux growth technique. The Li-content of a lithium tantalate crystal has been determined using the zero-birefringence temperature and Curie measurements, confirming the Li content is between that of congruent and stoichiometric crystals. X-ray diffraction measurements show the Nb/Ta displacement and octahedral tilt both decrease as the Ta content is increased. This also results in a decrease in the lattice parameters from lithium niobate to lithium tantalate. Birefringence measurements on the crystals as a function of temperature have been used to determine the point that the crystals become zero-birefringent, and by comparison with the structural studies have confirmed that it is not related to a phase transition and the structures remain polar through the zero-birefringence points.

Download Full-text

Enhanced piezoresponse and electric field induced relaxor-ferroelectric phase transition in NBT-0.06BT ceramic prepared from hydrothermally synthesized nanoparticles

Ceramics International ◽

10.1016/j.ceramint.2016.08.208 ◽

2016 ◽

Vol 42 (16) ◽

pp. 18631-18640 ◽

Cited By ~ 13

Author(s):

Xuefan Zhou ◽

Chao Jiang ◽

Hang Luo ◽

Chao Chen ◽

Kechao Zhou ◽

...

Keyword(s):

Phase Transition ◽

Electric Field ◽

Ferroelectric Phase Transition ◽

Ferroelectric Phase ◽

Relaxor Ferroelectric

Download Full-text

Tuning the ferroelectric phase transition of PVDF by uniaxially stretching crosslinked PVDF films with CFCH bonds

Journal of Materials Chemistry C ◽

10.1039/d0tc02559c ◽

2020 ◽

Vol 8 (33) ◽

pp. 11426-11440

Author(s):

Xiao Wang ◽

Baobao Qiao ◽

Shaobo Tan ◽

Weiwei Zhu ◽

Zhicheng Zhang

Keyword(s):

Phase Transition ◽

Ferroelectric Phase Transition ◽

Vinylidene Fluoride ◽

Ferroelectric Phase ◽

Relaxor Ferroelectric ◽

Artificial Muscles ◽

Ferroelectric Polymers ◽

Poly Vinylidene Fluoride ◽

Electrostrictive Properties

Poly(vinylidene fluoride) (PVDF) based relaxor ferroelectric polymers show great potential for applications in transducers, sensors and artificial muscles for their excellent electrostrictive properties.

Download Full-text

Hypersonic and Dielectric Studies of Relaxor Ferroelectric Single Crystal

MRS Proceedings ◽

10.1557/proc-604-185 ◽

1999 ◽

Vol 604 ◽

Author(s):

Chi-Shun Tu ◽

V.H. Schmiidt ◽

C.-H. Yeh ◽

L.-F. Chen ◽

C.-L. Tsai

Keyword(s):

Phase Transition ◽

Dielectric Permittivity ◽

Single Crystal ◽

Thermal Hysteresis ◽

Relaxor Ferroelectric ◽

Dipolar Relaxation ◽

First Order ◽

Dielectric Data ◽

Scattering Spectra ◽

Ferroelectric Single Crystal

AbstractBoth the longitudinal (LA) Brillouin back-scattering spectra and dielectric permittivity along the [001] direction have been measured as a function of temperature for a relaxor ferroelectric single crystal (PbMg1/3Nb2/3O3)0.68(PbTiO3)0.32 (PMN-32%PT). A sharp ferroelectric phase transition (which is associated with a Landau-Khalatnikov-like phonon damping maximum) was observed near 445 K. As temperature increases, a diffuse phase transition was detected near 280 K. In addition, the nature of the thermal hysteresis for the dielectric permittivity confirms that these transitions (near 280 and 445 K for heating procedure) are diffuse first-order and first-order, It respectively. The dielectric data prove the existence of an electric dipolar relaxation process below 300 K.

Download Full-text