Temperature Dependence of the Local Structure in Pb Containing Relaxor Ferroelectrics

2003 ◽  
Author(s):  
T. Egami
Keyword(s):  
Temperature Dependence ◽  
Local Structure ◽  
Relaxor Ferroelectrics

scholarly journals Atomic-resolution electron microscopy of nanoscale local structure in lead-based relaxor ferroelectrics

2020 ◽  
Vol 20 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Abinash Kumar ◽  
Jonathon N. Baker ◽  
Preston C. Bowes ◽  
Matthew J. Cabral ◽  
Shujun Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Local Structure ◽  
Relaxor Ferroelectrics ◽  
Atomic Resolution ◽  
Resolution Electron

Investigation of Polarization Mechanism of Relaxor Ferroelectrics

1996 ◽  
Vol 453 ◽  
Author(s):  
Z. -Y. Cheng ◽  
R. S. Katiyar ◽  
Yao Xi
Keyword(s):  
Dielectric Constant ◽  
Low Temperature ◽  
Temperature Dependence ◽  
High Precision ◽  
Relaxor Ferroelectrics ◽  
Dielectric Behavior ◽  
Polar Regions ◽  
Thermally Activated ◽  
Polarization Mechanism ◽  
Constant Maximum

AbstractAddition to thermally activated flips of polar regions in relaxor ferroelectrics, a new polarization mechanism, which originates from the vibrations (breathing) of surface of polar regions, is introduced to explain the dielectric behavior of relaxor ferroelectrics. This new mechanism plays an important role in the dielectric behavior of such materials at low temperature. Based on the above assumption and general dielectric theory, a formula is given to characterize the temperature dependence of the dielectric constant. The correctness of the formula is verified by using it to fit the experimental results of the two typical relaxors. The fitted results show that the method is of high precision and that the temperature of the dielectric constant maximum is decided by the two polarization behavior. It also indicates that the new polarization is a resonance polarization.

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.

STUDY OF LOCAL STRUCTURE IN UNDER-DOPED La2-xSrxCuO4-y BY POLARIZED EXAFS

2002 ◽  
Vol 16 (11n12) ◽  
pp. 1641-1648 ◽  
Author(s):  
K. B. GARG ◽  
C. SANCHEZ ◽  
J. GARCIA ◽  
J. BLASCO ◽  
R. K. SINGHAL ◽  
...  
Keyword(s):  
Fine Structure ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Local Structure ◽  
X Ray ◽  
Absorption Fine ◽  
Local Lattice ◽  
X Ray Absorption

Temperature dependence of local structure of the CuO 2 plane has been studied by in plane polarized (E//ab) Cu K-edge extended X-ray absorption fine structure (EXAFS) experiments on an under-doped single crystal of superconducting La1.87Sr0.13CuO 4-y system with T c =32  K . The temperature dependence of the Debye–Waller factors for the Cu-O and Cu-La/Sr pairs are determined. We find that the motion of Cu and O atoms in the Cu-O bond is partially correlated at higher temperatures, going over to an uncorrelated motion at lower temperatures. The results are discussed in terms of the local lattice instabilities and stripes as reported in other systems.

Temperature dependence of the local structure around the tantalum atom in potassium tantalate

1994 ◽  
Vol 6 (44) ◽  
pp. 9317-9328 ◽  
Author(s):  
Y Nishihata ◽  
O Kamishima ◽  
K Ojima ◽  
A Sawada ◽  
H Maeda ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Local Structure ◽  
Potassium Tantalate

scholarly journals Temperature Dependence of the Electric Field Induced Strains in Pb (Mg1/3Nb2/3)O3-Based Relaxor Ferroelectrics

1995 ◽  
Vol 103 (1193) ◽  
pp. 16-19 ◽  
Author(s):  
Jae-Hwan PARK ◽  
Byung-Kook KIM ◽  
Kug-Hyun SONG ◽  
Soon Ja PARK
Keyword(s):  
Electric Field ◽  
Temperature Dependence ◽  
Relaxor Ferroelectrics

Local structure in perovskite relaxor ferroelectrics by207PbNMR

2004 ◽  
Vol 69 (13) ◽  
Author(s):  
Donghua H. Zhou ◽  
Gina L. Hoatson ◽  
Robert L. Vold ◽  
Franck Fayon
Keyword(s):  
Local Structure ◽  
Relaxor Ferroelectrics

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.

Composition Dependence of Dielectric Anomaly in Strontium Bismuth Tantalate Thin Films

1998 ◽  
Vol 541 ◽  
Author(s):  
Koichi Takemura ◽  
Takehiro Noguchi ◽  
Takashi Hase ◽  
Hidekazu Kimura ◽  
Yoichi Miyasaka
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Local Structure ◽  
Remanent Polarization ◽  
Composition Dependence ◽  
Lattice Structure ◽  
Ferroelectric Properties ◽  
Dielectric Anomaly ◽  
Strontium Bismuth Tantalate ◽  
First Order

AbstractEffects of off-stoichiometry and Nb substitution on the dielectric anomaly and ferroelectric properties have been investigated for SrBi2Ta2O9(SBT) thin films. Local atomic environment for the stoichiometric and off-stoichiometric SBT films has been also measured. The features of the dielectric anomaly, the Curie temperature (Tc), and the temperature dependence of the spontaneous polarization (Ps) are independent of the film thickness, and are governed by the nature of the crystal. For the stoichiometric Sr content SBT films, the grain size increases and the temperature dependence of the remanent polarization (Pr) decreases with increasing thickness. For the films with Sr/Bi/Ta = 0.8/2/2 and 0.8/2.2/2, Sr deficient local structure was observed, and such lattice structure probably leads to higher Tc than the stoichiometric crystal. Nb substitution for Ta also raises Tc, and makes the dielectric anomaly sharper. The phase transition associated with the dielectric anomaly for these films is thought to be first-order.

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