Photorefractive effect in the relaxor ferroelectric material 091Pb(Zn_1/3Nb_2/3)O_3–009PbTiO_3

2003 ◽  
Vol 28 (6) ◽  
pp. 420 ◽  
Author(s):  
Saori Abe ◽  
Tomoyasu Fujishima ◽  
Takashi Tsubone ◽  
Ryushi Fujimura ◽  
Hidenobu Ono ◽  
...  
Keyword(s):  
Photorefractive Effect ◽  
Ferroelectric Material ◽  
Relaxor Ferroelectric

Photorefractive effect in Pb-based relaxor ferroelectric materials

2008 ◽  
Author(s):  
S. Suttirak ◽  
P. Buranasiri ◽  
P. P. Banerjee ◽  
N. Witthayakorn ◽  
W. Neeyakorn
Keyword(s):  
Photorefractive Effect ◽  
Ferroelectric Materials ◽  
Relaxor Ferroelectric

Preparations and Characterizations of Perovskite PMN Ceramics by Using a One-Step Calcination Method

2007 ◽  
Vol 26-28 ◽  
pp. 255-258
Author(s):  
Jin Chen ◽  
Hui Qing Fan ◽  
Xiu Li Chen ◽  
Shao Jun Qiu
Keyword(s):  
Dielectric Constant ◽  
Room Temperature ◽  
Pyrochlore Phase ◽  
Ferroelectric Material ◽  
Relaxor Ferroelectric ◽  
One Step ◽  
Calcination Method ◽  
Constant Maximum

A relaxor ferroelectric material, Pb(Mg1/3Nb2/3)O3 (PMN) powder with a pyrochlore-free phase, was prepared by using a one-step calcinations method. The pyrochlore phase was prevented by coating Mg(OH)2 on Nb2O5 particles. Pure-perovskite PMN powder was synthesized by a single calcination of the coating powder mixed with appropriate amounts of PbO at 900 oC for 2 h. The pyrochlore-free perovskite PMN powders were sintered to 96.9% density at 1100 oC. The sintered PMN ceramics exhibited a dielectric constant maximum of ~11 700 at room temperature at a frequency of 1 kHz.

Photorefractive effect and photochromism in the Fe-doped relaxor ferroelectric crystal Pb(Zn1∕3Nb2∕3)O3-PbTiO3

2004 ◽  
Vol 96 (9) ◽  
pp. 4852-4855 ◽  
Author(s):  
Y. Sato ◽  
S. Abe ◽  
R. Fujimura ◽  
H. Ono ◽  
K. Oda ◽  
...  
Keyword(s):  
Photorefractive Effect ◽  
Relaxor Ferroelectric ◽  
Ferroelectric Crystal

Photorefractive effect in relaxor ferroelectric 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystal

2006 ◽  
Vol 89 (26) ◽  
pp. 261111 ◽  
Author(s):  
Chongjun He ◽  
Zhongxiang Zhou ◽  
Dajun Liu ◽  
Xiangyong Zhao ◽  
Haosu Luo
Keyword(s):  
Single Crystal ◽  
Photorefractive Effect ◽  
Relaxor Ferroelectric

scholarly journals Dielectric behaviour of (Ba0.77Ca0.23)(Ti0.98Dy0.02)O3 ceramics

2015 ◽  
Vol 9 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Abdul Moquim ◽  
Manas Panigrahi
Keyword(s):  
Single Phase ◽  
Structural Parameters ◽  
Main Idea ◽  
Ferroelectric Material ◽  
Calcium Titanate ◽  
Relaxor Ferroelectric ◽  
Dielectric Study ◽  
Secondary Phases ◽  
Multifunctional Material ◽  
Titanate Ceramics

In this study, BaTiO3 is modified with Ca2+ and in addition doped with Dy3+ at the B site lattice. The main idea is to search for new lead-free ferroelectric material and improve their properties. For this purpose, the barium calcium titanate (BCT) as a host and the rare earth element Dy3+ as an activator were used to fabricate a multifunctional material. The obtained ceramics was found to be homogeneous, dense and a single phase material with no evidence of secondary phases. The dielectric study showed that TC increases with the addition of dopants and the obtained ceramics behaves like a relaxor ferroelectric. Some important structural parameters and dielectric properties of dysprosium modified barium (calcium) titanate ceramics are presented.

Correlation Between Large Electrostrictive Strain and Relaxor Behavior with Structural Changes Induced in P(VDF-TrFE) Copolymer by Electron Irradiation

1998 ◽  
Vol 541 ◽  
Author(s):  
Vivek Bharti ◽  
Yaohong Ye ◽  
T.-B. Xu ◽  
Q. M. Zhang
Keyword(s):  
Electron Irradiation ◽  
Structural Changes ◽  
High Energy ◽  
Ferroelectric Material ◽  
Relaxor Ferroelectric ◽  
Polymer Materials ◽  
Irradiation Condition ◽  
Polar Regions ◽  
Relaxor Behavior ◽  
High Dielectric

AbstractThe effect of high energy electron irradiation is investigated on poly(vinylidene fluoridetrifluoroethylene), P(VDF-TrFE), copolymers in the broad range of irradiation doses and temperature. It was found that after a suitable electron irradiation condition, ferroelectric polymer materials show exceptionally high electrostrictive response (> 4%), high dielectric constant (>60) with low dielectric loss over a broad temperature range. In addition, the material after irradiation exhibits many features resembling those of a relaxor ferroelectric, suggesting that the electron irradiation breaks up the coherent polarization domain in a normal ferroelectric material into micro-polar regions that transform the material into a relaxor ferroelectric. These distinct features make this material very attractive for a broad range of applications. In this paper we will review the experimental results on various characteristics of material properties including the dielectric and electrostrictive strain response induced at different temperatures under different electron irradiation conditions and their relation with structural changes observed by X-ray and DSC.

Electron microscopy studies of PZT ferroelectric film capacitor structures

1992 ◽  
Vol 50 (2) ◽  
pp. 1364-1365
Author(s):  
V. Kaushik ◽  
P. Maniar ◽  
J. Olowolafe ◽  
R. Jones ◽  
A. Campbell ◽  
...  
Keyword(s):  
Electric Fields ◽  
Sol Gel ◽  
Ferroelectric Material ◽  
Dielectric Constants ◽  
Dielectric Films ◽  
Lead Zirconium Titanate ◽  
Si Substrate ◽  
Film Capacitor ◽  
Pzt Films ◽  
High Dielectric

Lead zirconium titanate films (Pb (Zr,Ti) O3 or PZT) are being considered for potential application as dielectric films in memory technology due to their high dielectric constants. PZT is a ferroelectric material which shows spontaneous polarizability, reversible under applied electric fields. We report herein some results of TEM studies on thin film capacitor structures containing PZT films with platinum-titanium electrodes.The wafers had a stacked structure consisting of PZT/Pt/Ti/SiO2/Si substrate as shown in Figure 1. Platinum acts as electrode material and titanium is used to overcome the problem of platinum adhesion to the oxide layer. The PZT (0/20/80) films were deposited using a sol-gel method and the structure was annealed at 650°C and 800°C for 30 min in an oxygen ambient. XTEM imaging was done at 200KV with the electron beam parallel to <110> zone axis of silicon.Figure 2 shows the PZT and Pt layers only, since the structure had a tendency to peel off at the Ti-Pt interface during TEM sample preparation.

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.

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