Mesoscopic hierarchic polarization structure in the relaxor ferroelectrics Pb[(Mg1/3Nb2/3)1−xTix]O3

2019 ◽  
Vol 100 (18) ◽  
Author(s):  
K. Namikawa ◽  
M. Ishino ◽  
M. Matsushita ◽  
K. Ohwada ◽  
M. Kishimoto ◽  
...  
Keyword(s):  
Relaxor Ferroelectrics ◽  
Polarization Structure

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.

Comparison of random field strengths in (1-x)SrTiO3-xBiFeO3 and (1-x)SrTiO3-xBaTiO3 relaxor ferroelectrics by means of acoustic emission

2020 ◽  
Vol 92 (2) ◽  
pp. 20401
Author(s):  
Evgeniy Dul'kin ◽  
Michael Roth
Keyword(s):  
Acoustic Emission ◽  
Random Field ◽  
Electric Fields ◽  
Bias Field ◽  
Relaxor Ferroelectrics ◽  
External Bias ◽  
Field Strengths

In relaxor (1-x)SrTiO3-xBiFeO3 ferroelectrics ceramics (x = 0.2, 0.3 and 0.4) both intermediate temperatures and Burns temperatures were successfully detected and their behavior were investigated in dependence on an external bias field using an acoustic emission. All these temperatures exhibit a non-trivial behavior, i.e. attain the minima at some threshold fields as a bias field enhances. It is established that the threshold fields decrease as x increases in (1-x)SrTiO3-xBiFeO3, as it previously observed in (1-x)SrTiO3-xBaTiO3 (E. Dul'kin, J. Zhai, M. Roth, Phys. Status Solidi B 252, 2079 (2015)). Based on the data of the threshold fields the mechanisms of arising of random electric fields are discussed and their strengths are compared in both these relaxor ferroelectrics.

Symmetry of the Underlying Lattice in (K,Na)NbO3-Based Relaxor Ferroelectrics with Large Electromechanical Response

2021 ◽  
Vol 13 (6) ◽  
pp. 7461-7469
Author(s):  
Nan Zhang ◽  
Ting Zheng ◽  
Ning Li ◽  
Chunlin Zhao ◽  
Jie Yin ◽  
...  
Keyword(s):  
Relaxor Ferroelectrics

scholarly journals Implications of acceptor doping in the polarization and electrocaloric response of 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 relaxor ferroelectric ceramics

2021 ◽  
Vol 9 (9) ◽  
pp. 3204-3214
Author(s):  
Andraž Bradeško ◽  
Marko Vrabelj ◽  
Lovro Fulanović ◽  
Šarūnas Svirskas ◽  
Maksim Ivanov ◽  
...  
Keyword(s):  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Ferroelectric Ceramics ◽  
Acceptor Doping ◽  
Defect Engineering ◽  
Relaxor Ferroelectric Ceramics

Defect engineering by acceptor doping affects the dipolar state in relaxor ferroelectrics, resulting in a tailored electrocaloric response.

Large electrocaloric response with superior temperature stability in NaNbO3-based relaxor ferroelectrics benefiting from crossover region

2020 ◽  
Author(s):  
Ling Zhang ◽  
Chunlin Zhao ◽  
Ting Zheng ◽  
Jiagang Wu
Keyword(s):  
Temperature Change ◽  
Temperature Stability ◽  
Relaxor Ferroelectrics ◽  
Adiabatic Temperature ◽  
Next Generation ◽  
Crossover Region ◽  
Adiabatic Temperature Change

Electrocaloric refrigeration emerges as a newly-developing technology with potential to be the next generation of coolers. However, the combination of large adiabatic temperature change (ΔT) and good temperature stability remains...

scholarly journals Serendipitous VLBI Observations of Intraday Variability in the BL Lac Objects 1334–127, 2131–021, and 2155–152

1998 ◽  
Vol 164 ◽  
pp. 273-274
Author(s):  
P. Yu. Kochanev ◽  
D. C. Gabuzda
Keyword(s):  
Rapid Variability ◽  
Bl Lac Objects ◽  
Polarization Structure ◽  
Vlbi Observations ◽  
Bl Lac ◽  
Vlbi Data ◽  
Intraday Variability

AbstractGlobal λ = 6 cm VLBI polarization observations of intraday variability in the three BLLacertae objects 1334–127, 2131–021, and 2155–152 are analyzed. Integrated VLA measurements during the VLBI observations show that although there were no substantial total intensity variations, the polarizations for these three sources varied significantly during the VLBI experiment. The VLBI data were divided into 2-3 hour segments in order to search for corresponding rapid variability in the VLBI polarization structure. Our analysis shows that the VLA polarization variability in 2155–152 and 2131–021 is present in the VLBI data (i.e., it occurred on mas scales), but this is not the case for 1334–127.

scholarly journals Connecting the Multiscale Structure with Macroscopic Response of Relaxor Ferroelectrics

2020 ◽  
Vol 30 (52) ◽  
pp. 2006823 ◽  
Author(s):  
Mojca Otoničar ◽  
Andraž Bradeško ◽  
Lovro Fulanović ◽  
Tomaž Kos ◽  
Hana Uršič ◽  
...  
Keyword(s):  
Relaxor Ferroelectrics ◽  
Multiscale Structure ◽  
Macroscopic Response

Calcium substituting B-site in relaxor ferroelectrics with perovskite structure probed by chemical ordering

2005 ◽  
Vol 134 (6) ◽  
pp. 425-429 ◽  
Author(s):  
Ni Zhong ◽  
Wen-long Yao ◽  
Ping-hua Xiang ◽  
Chu-de Feng ◽  
Seiji Kojima
Keyword(s):  
Perovskite Structure ◽  
Relaxor Ferroelectrics ◽  
Chemical Ordering
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