scholarly journals Piezoelectric polar nanoregions and relaxation-coupled resonances in relaxor ferroelectrics

2018 ◽  
Vol 98 (13) ◽  
Author(s):  
Ling Cai ◽  
Radha Pattnaik ◽  
Joel Lundeen ◽  
Jean Toulouse
Keyword(s):  
Relaxor Ferroelectrics ◽  
Polar Nanoregions

Dynamics of Central Peaks in the Brillouin Scattering Spectra of Relaxor Ferroelectrics

2009 ◽  
Vol 421-422 ◽  
pp. 403-406
Author(s):  
Ghulam Shabbir ◽  
Seiji Kojima
Keyword(s):  
High Resolution ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Brillouin Scattering ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Subsequent Growth ◽  
Scattering Technique ◽  
Scattering Spectra ◽  
Polar Nanoregions

High-resolution Brillouin scattering technique was applied to study the dynamics of central peaks (CPs) in two relaxor ferroelectric systems, PLZT-x/65/35 ceramics and PMN-33%PT [001] single crystals, respectively. It was found that CPs appear very close to an intermediate temperature, Td, for both type of specimens. The temperature dependence of CPs was attributed to the appearance and subsequent growth of polar nanoregions (PNRs) intrinsic to relaxor materials.

scholarly journals Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations

2016 ◽  
Vol 2 (9) ◽  
pp. e1501814 ◽  
Author(s):  
Michael E. Manley ◽  
Douglas L. Abernathy ◽  
Raffi Sahul ◽  
Daniel E. Parshall ◽  
Jeffrey W. Lynn ◽  
...  
Keyword(s):  
Local Structure ◽  
Electromechanical Coupling ◽  
Collective Motion ◽  
Piezoelectric Materials ◽  
Relaxor Ferroelectrics ◽  
Piezoelectric Response ◽  
Atomic Displacements ◽  
Electromechanical Responses ◽  
Polar Nanoregions ◽  
Ultrasound Applications

Relaxor-based ferroelectrics are prized for their giant electromechanical coupling and have revolutionized sensor and ultrasound applications. A long-standing challenge for piezoelectric materials has been to understand how these ultrahigh electromechanical responses occur when the polar atomic displacements underlying the response are partially broken into polar nanoregions (PNRs) in relaxor-based ferroelectrics. Given the complex inhomogeneous nanostructure of these materials, it has generally been assumed that this enhanced response must involve complicated interactions. By using neutron scattering measurements of lattice dynamics and local structure, we show that the vibrational modes of the PNRs enable giant coupling by softening the underlying macrodomain polarization rotations in relaxor-based ferroelectric PMN-xPT {(1 − x)[Pb(Mg1/3Nb2/3)O3] – xPbTiO3} (x = 30%). The mechanism involves the collective motion of the PNRs with transverse acoustic phonons and results in two hybrid modes, one softer and one stiffer than the bare acoustic phonon. The softer mode is the origin of macroscopic shear softening. Furthermore, a PNR mode and a component of the local structure align in an electric field; this further enhances shear softening, revealing a way to tune the ultrahigh piezoelectric response by engineering elastic shear softening.

Hysteresis Phenomena in Relaxor Ferroelectrics: Consideration of Polar Nanoregions

2017 ◽  
Vol 255 (2) ◽  
pp. 1700245 ◽  
Author(s):  
Alexander S. Starkov ◽  
Ivan A. Starkov ◽  
Antonina I. Dedyk ◽  
Gunnar Suchaneck ◽  
Gerald Gerlach
Keyword(s):  
Relaxor Ferroelectrics ◽  
Polar Nanoregions ◽  
Hysteresis Phenomena

scholarly journals Field-Induced Percolation of Polar Nanoregions in Relaxor Ferroelectrics

2013 ◽  
Vol 110 (20) ◽  
Author(s):  
S. Prosandeev ◽  
Dawei Wang ◽  
A. R. Akbarzadeh ◽  
B. Dkhil ◽  
L. Bellaiche
Keyword(s):  
Relaxor Ferroelectrics ◽  
Polar Nanoregions

scholarly journals Abnormal phase transition and polarization mismatch phenomena in BaTiO3-based relaxor ferroelectrics

2019 ◽  
Vol 09 (05) ◽  
pp. 1930002 ◽  
Author(s):  
Qingyuan Hu ◽  
Xiaoyong Wei
Keyword(s):  
Phase Transition ◽  
Solid Solutions ◽  
High Performance ◽  
Lattice Parameter ◽  
Relaxor Ferroelectrics ◽  
Piezoelectric Energy ◽  
Temperature Polarization ◽  
Aliovalent Substitution ◽  
Polar Nanoregions ◽  
Mismatch Theory

Relaxor ferroelectrics have been extensively studied due to their outstanding dielectric, piezoelectric, energy storage, and electro-optical properties. Although various theories were proposed to elaborate on the relaxation phenomena, polar nanoregions formed by disruption of the long-range-order structures are considered to play a key role in relaxor ferroelectrics. Generally, relaxor ferroelectrics are formed by aliovalent substitution or isovalent substitution in normal ferroelectrics, or further combinations of solid solutions. Herein, one category of BaTiO3-based relaxor ferroelectrics with abnormal phase transition and polarization mismatch phenomena is focused. Characteristic parameters of such BaTiO3-based relaxor ferroelectrics, including the Curie temperature, polarization, and lattice parameter, show a typical “U”-shaped variation with compositions. The studied BaTiO3-based relaxor ferroelectrics are mostly solid solutions of [Formula: see text]-site coupling and [Formula: see text]-site coupling ferroelectrics, exhibiting polarization mismatch in certain compositions [e.g., 0.9BaTiO3–0.1BiScO3, 0.8BaTiO3–0.2Bi([Formula: see text][Formula: see text]O3, 0.8BaTiO3–0.2Bi([Formula: see text][Formula: see text]O3, 0.5BaTiO3–0.5Pb([Formula: see text][Formula: see text]O3, 0.4BaTiO3–0.6Pb([Formula: see text][Formula: see text]O3, etc.]. Of particular interest is that excellent electrical properties can be achieved in the studied relaxor ferroelectrics. Therefore, polarization mismatch theory can also provide guidance for the design of new high-performance lead-free relaxor ferroelectrics.

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