Temperature and Stress Induced Electromechanical Coupling in Relaxor Ferroelectric Compounds

2015 ◽  
Vol 481 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Syed Mahboob ◽  
G. Prasad ◽  
G. S. Kumar
Keyword(s):  
Electromechanical Coupling ◽  
Relaxor Ferroelectric

scholarly journals Response to comment on “Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations”

2019 ◽  
Vol 5 (3) ◽  
pp. eaaw4367
Author(s):  
M. E. Manley ◽  
D. L. Abernathy ◽  
A. D. Christianson ◽  
J. W. Lynn
Keyword(s):  
Multiple Scattering ◽  
Electromechanical Coupling ◽  
Time Of Flight ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Instrument Resolution ◽  
Scattering Geometry ◽  
Transverse Acoustic

Gehring et al. argue that a splitting observed by us in the transverse acoustic (TA) phonon in the relaxor ferroelectric Pb[(Mg1/3Nb2/3)1−xTix]O3 with x = 0.30 (PMN-30PT) is caused by a combination of inelastic-elastic multiple scattering processes called ghostons. Their argument is motivated by differences observed between their measurements made on a triple-axis spectrometer and our measurements on a time-of-flight spectrometer. We show that the differences can be explained by differences in the instrument resolution functions. We demonstrate that the multiple scattering conditions proposed by Gehring et al. do not work for our scattering geometry. We also show that, when a ghoston is present, it is too weak to detect and therefore cannot explain the splitting. Last, this phonon splitting is just one part of the argument, and the overall conclusion of the original paper is supported by other results.

Phase-Field Study of Electromechanical Coupling in Lead-Free Relaxor/Ferroelectric-Layered Composites

2018 ◽  
Vol 5 (2) ◽  
pp. 1800710 ◽  
Author(s):  
Shuai Wang ◽  
Azatuhi Ayrikyan ◽  
Haibo Zhang ◽  
Kyle G. Webber ◽  
Bai-Xiang Xu
Keyword(s):  
Field Study ◽  
Phase Field ◽  
Electromechanical Coupling ◽  
Relaxor Ferroelectric ◽  
Lead Free ◽  
Layered Composites

Application study of Mn-doped PIN-PMN-PT relaxor ferroelectric crystal grown by Vertical Gradient Freeze method

2020 ◽  
Vol 557 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Zibo Jiang ◽  
Zuo-Guang Ye
Keyword(s):  
High Performance ◽  
Electromechanical Coupling ◽  
Strong Electric Field ◽  
Vertical Gradient ◽  
Pyroelectric Coefficient ◽  
Relaxor Ferroelectric ◽  
Dielectric Constants ◽  
Coupling Coefficients ◽  
Ferroelectric Crystal ◽  
Vertical Gradient Freeze

A 3-inch Mn:PIN-36%PMN-32%PT (Generation III) relaxor ferroelectric crystal was grown using the Vertical Gradient Freeze method. Crystals of [1, 11] and [111] orientations were prepared and studied, evaluating their dielectric constants, piezoelectric coefficients, electromechanical coupling coefficients, loss tangents and pyroelectric coefficients. It is shown that in pyroelectric applications, [111]-poled crystals are particularly suitable for high performance sensors due to a relatively high pyroelectric coefficient, low loss tangent. In addition, the specific heat is lower as compared to LiTaO3. It is also shown that the alternating current (AC) poling has a more significant effect on the [001]-poled crystal than on the [011]- and [111]-poled crystals due to the lattice distortion induced by a strong electric field along the [001] direction.

FLEXOELECTRIC EFFECT IN FERROELECTRICS

2008 ◽  
Vol 01 (03) ◽  
pp. 235-238 ◽  
Author(s):  
WENHUI MA
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Electromechanical Coupling ◽  
Mechanical Strain ◽  
Relaxor Ferroelectric ◽  
Ferroelectric Thin Films ◽  
Unique Contribution ◽  
Flexoelectric Effect ◽  
Impact Phase ◽  
Impact Polarization

Flexoelectric effect and its influence on the application of multifunctional ferroelectrics have been investigated. Theory of flexoelectric coupling has indicated that mechanical strain gradient can impact polarization in a way analogous to electric field. Experimentally, magnitudes of the flexoelectric coefficients have been measured in ferroelectric, incipient ferroelectric and relaxor ferroelectric perovskites. Present data of flexoelectricity suggests that such unconventional electromechanical coupling could make unique contribution to properly engineered ferroelectric thin films and nanostructures. Flexoelectric effect is expected to intensify at small dimensions and get large enough at nanoscale to significantly impact phase transition and functional response in ferroelectrics.

scholarly journals Comment on “Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations”

2019 ◽  
Vol 5 (3) ◽  
pp. eaar5066 ◽  
Author(s):  
P. M. Gehring ◽  
Zhijun Xu ◽  
C. Stock ◽  
Guangyong Xu ◽  
D. Parshall ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Electromechanical Coupling ◽  
Relaxor Ferroelectrics ◽  
Alternative Interpretation ◽  
Relaxor Ferroelectric ◽  
Lattice Vibrations ◽  
Phonon Branch ◽  
Transverse Acoustic ◽  
Neutron Wavelength ◽  
Polar Nanoregions

Manley et al. (Science Advances, 16 September 2016, p. e1501814) report the splitting of a transverse acoustic phonon branch below TC in the relaxor ferroelectric Pb[(Mg1/3Nb2/3)1−xTix]O3 with x = 0.30 using neutron scattering methods. Manley et al. argue that this splitting occurs because these phonons hybridize with local, harmonic lattice vibrations associated with polar nanoregions. We show that splitting is absent when the measurement is made using a different neutron wavelength, and we suggest an alternative interpretation.

Local atomic structure of relaxor ferroelectric solids studied by pulsed neutron scattering

1994 ◽  
Vol 52 ◽  
pp. 554-555
Author(s):  
T. Egami ◽  
H. D. Rosenfeld ◽  
S. Teslic
Keyword(s):  
Neutron Scattering ◽  
Atomic Structure ◽  
Argonne National Laboratory ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Crystallographic Structure ◽  
Chemical Inhomogeneity ◽  
Distribution Analysis ◽  
Ferroelectric Transition ◽  
Pulsed Neutron

Relaxor ferroelectrics, such as Pb(Mg1/3Nb2/3)O3 (PMN) or (Pb·88La ·12)(Zr·65Ti·35)O3 (PLZT), show diffuse ferroelectric transition which depends upon frequency of the a.c. field. In spite of their wide use in various applications details of their atomic structure and the mechanism of relaxor ferroelectric transition are not sufficiently understood. While their crystallographic structure is cubic perovskite, ABO3, their thermal factors (apparent amplitude of thermal vibration) is quite large, suggesting local displacive disorder due to heterovalent ion mixing. Electron microscopy suggests nano-scale structural as well as chemical inhomogeneity.We have studied the atomic structure of these solids by pulsed neutron scattering using the atomic pair-distribution analysis. The measurements were made at the Intense Pulsed Neutron Source (IPNS) of Argonne National Laboratory. Pulsed neutrons are produced by a pulsed proton beam accelerated to 750 MeV hitting a uranium target at a rate of 30 Hz. Even after moderation by a liquid methane moderator high flux of epithermal neutrons with energies ranging up to few eV’s remain.

Pulsed laser deposition of relaxor ferroelectric films

1998 ◽  
Vol 08 (PR9) ◽  
pp. Pr9-261-Pr9-264
Author(s):  
M. Tyunina ◽  
J. Levoska ◽  
A. Sternberg ◽  
V. Zauls ◽  
M. Kundzinsh ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Relaxor Ferroelectric ◽  
Laser Deposition ◽  
Ferroelectric Films
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