Room Temperature Ferroelectric Terpolymers with Large Spontaneous Polarization

1995 ◽  
Vol 28 (15) ◽  
pp. 5274-5279 ◽  
Author(s):  
J. Naciri ◽  
B. R. Ratna ◽  
S. Baral-Tosh ◽  
P. Keller ◽  
R. Shashidhar
Keyword(s):  
Spontaneous Polarization ◽  
Room Temperature

EFFECT OF YTTRIUM ON DIELECTRIC, PYROELECTRIC AND PIEZOELECTRIC PROPERTIES OF PBN FERROELECTRICS

2006 ◽  
Vol 20 (21) ◽  
pp. 3081-3091 ◽  
Author(s):  
K. SAMBASIVA RAO ◽  
N. VALLIS NATH ◽  
P. MURALI KRISHNA ◽  
D. MADHAVA PRASAD ◽  
JOON HYUNG LEE
Keyword(s):  
Transition Temperature ◽  
Spontaneous Polarization ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Pyroelectric Coefficient ◽  
Tetragonal Symmetry ◽  
Maximum Volume ◽  
Stiffness Constant ◽  
Method Substitution ◽  
Sintering Method

Materials with batch formula Pb (1-x-3y/2) R y Ba x Nb 2 O 6, where R=Y, (1-x)=0.73, 0.63, 0.53 and y=0.00, 0.02 have been prepared by the double sintering method. Substitution of yttrium (Y) restored tetragonal symmetry of PBN but reduced lattice parameters, cell volume and enhanced the density. Transition temperature of PBN has decreased due to the substitution of Y3+. Enhanced room temperature spontaneous polarization (Ps)=149.97 μ C/sq. cm has been observed in PBN53, which is above MPB, whereas enhanced value of Ps=112.74 μ C/sq. cm is found in Y: PBN63 at MPB region. The room temperature Pyroelectric coefficient (PRT=1.07) has been observed in the composition where maximum volume of Ps is obtained. Similarly, enhanced values of piezoelectric coefficients Kp=0.244, Kt=0.353, K31=0.131, d31=60, d33=159 and g31=3.65 have also been found in the same material PBN53. Substitution of Yttrium enhanced the stiffness constant 13.59 in PBN 73 to 14.27 of Y: PBN73.

Large Spontaneous Polarization and Clear Hysteresis Loop of a Room-Temperature Hybrid Ferroelectric Based on Mixed-Halide [BiI3Cl2] Polar Chains and Methylviologen Dication

2011 ◽  
Vol 133 (38) ◽  
pp. 14924-14927 ◽  
Author(s):  
Nicolas Leblanc ◽  
Nicolas Mercier ◽  
Leokadiya Zorina ◽  
Sergey Simonov ◽  
Pascale Auban-Senzier ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Spontaneous Polarization ◽  
Room Temperature

Electrooptic study of antiferroelectric mixtures for display application

2006 ◽  
Vol 14 (4) ◽  
Author(s):  
A. Mikułko ◽  
M. Marzec ◽  
S. Wróbel ◽  
R. Dąbrowski
Keyword(s):  
Field Theory ◽  
Phase Transitions ◽  
Electric Field ◽  
Tilt Angle ◽  
Spontaneous Polarization ◽  
Room Temperature ◽  
Mean Field Theory ◽  
Mean Field ◽  
Current Method ◽  
Range Measurements

AbstractThe aim of this paper is to study the influence of electric field on alignment of para-, ferro- and antiferroelectric phases in the vicinity of SmA* — SmC* or SmC* — SmCA* phase transitions as to obtain mono-domain cells. Four mixtures studied (W-193B, W-193B-1, W-201, W-204D) show the SmCA* phase in a wide room temperature range. Measurements of the spontaneous polarization versus temperature by using reversal current method give an answer to the question, what kind of the transitions take place between para-, ferro- or antiferroelectric phases using the Landau mean field theory. Optimal electrooptic parameters for different compositions of the mixtures such as tilt angle, spontaneous polarization and saturation voltage have been measured to compare parameters of the mixtures studied.

Induction of a room temperature ferroelectric SmC* phase in binary mixtures with moderate spontaneous polarization and sub-millisecond switching time

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 84369-84378 ◽  
Author(s):  
A. Debnath ◽  
P. K. Mandal ◽  
D. Węglowska ◽  
R. Dąbrowski
Keyword(s):  
Binary Mixture ◽  
Binary Mixtures ◽  
Spontaneous Polarization ◽  
Room Temperature ◽  
Switching Time

Induction of room temperature SmC* phase in binary mixture.

A Molecular Ferroelectric Showing Room-Temperature Record-Fast Switching of Spontaneous Polarization

2018 ◽  
Vol 130 (31) ◽  
pp. 9981-9985 ◽  
Author(s):  
Zhihua Sun ◽  
Xianfeng Yi ◽  
Kewen Tao ◽  
Chengmin Ji ◽  
Xitao Liu ◽  
...  
Keyword(s):  
Spontaneous Polarization ◽  
Room Temperature ◽  
Temperature Record ◽  
Fast Switching

scholarly journals Spontaneous Polarization Buildup in a Room-Temperature Polariton Laser

2008 ◽  
Vol 101 (13) ◽  
Author(s):  
J. J. Baumberg ◽  
A. V. Kavokin ◽  
S. Christopoulos ◽  
A. J. D. Grundy ◽  
R. Butté ◽  
...  
Keyword(s):  
Spontaneous Polarization ◽  
Room Temperature

Ba6CoNb9O30 and Ba6FeNb9O30: Two New Tungsten-Bronze-Type Ferroelectrics. Centrosymmetry of Ba5.2K0.8U2.4Nb7.6O30 at 300 K

1997 ◽  
Vol 30 (4) ◽  
pp. 495-501 ◽  
Author(s):  
M. C. Foster ◽  
G. R. Brown ◽  
R. M. Nielson ◽  
S. C. Abrahams
Keyword(s):  
Phase Transition ◽  
Spontaneous Polarization ◽  
Diffuse Phase Transition ◽  
Room Temperature ◽  
Tungsten Bronze ◽  
Dielectric Anomaly ◽  
Structural Refinement ◽  
Space Group ◽  
Atomic Displacements ◽  
Diffuse Phase

Ba6CoNb9O30 and Ba6FeNb9O30 in space group P4bm are shown to satisfy the structural criteria for ferroelectricity. Ba6CoNb9O30 undergoes a diffuse phase transition at 660 (11) K, as observed calorimetrically, in addition to a dielectric permittivity anomaly with an onset temperature of 685 (10) K. The demonstration of dielectric hysteresis at room temperature under the application of a varied DC field reaching a maximum of ± 300 kV m−1, corresponding to a spontaneous polarization of 1.2 (5) × 10−2C m−2, provides unambiguous verification that it is a new ferroelectric. Ba6FeNb9O30 also undergoes a diffuse phase transition at 605 (16) K, with a dielectric anomaly at 583 (5) K, and exhibits dielectric hysteresis at room temperature under a varied DC field ranging to ± 310 kV m−1 corresponding to a spontaneous polarization of 2.2(5) × 10−2Cm−2; it too is demonstrably a new ferroelectric. Although Ba5.2K0.8U2.4Nb7.6O30 has also been reported in space group P4bm, all atomic displacements from the corresponding centrosymmetric positions are less than their refined root-mean-square thermal or static amplitudes. Such an arrangement is likely to be thermodynamically unstable. Either its space group has been incorrectly assigned, and reinvestigation will show the space group is P4/mbm, or the structural refinement is incomplete.

A Molecular Ferroelectric Showing Room-Temperature Record-Fast Switching of Spontaneous Polarization

2018 ◽  
Vol 57 (31) ◽  
pp. 9833-9837 ◽  
Author(s):  
Zhihua Sun ◽  
Xianfeng Yi ◽  
Kewen Tao ◽  
Chengmin Ji ◽  
Xitao Liu ◽  
...  
Keyword(s):  
Spontaneous Polarization ◽  
Room Temperature ◽  
Temperature Record ◽  
Fast Switching

Investigation of new chiral fluorosubstituted compound exhibiting room temperature antiferroelectric phase

2011 ◽  
Vol 19 (3) ◽  
Author(s):  
J. Czerwiec ◽  
M. Żurowska ◽  
K. Garbat ◽  
R. Dąbrowski ◽  
M. Marzec ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Field ◽  
External Electric Field ◽  
Spontaneous Polarization ◽  
Room Temperature ◽  
Relaxation Processes ◽  
Antiferroelectric Phase

AbstractInfluence of the electric field upon alignment of molecules in ferro- and antiferroelectric phases has been studied for two fluoro-substituted compounds exhibiting antiferroelectric phase at room temperature. Two different relaxation processes have been revealed in the ferroelectric as well as antiferroelectric phase. Low temperature value of spontaneous polarization is ca. 130 nC/cm2 for both substances studied. The substances align very well in the external electric field — a mono-domain of the ferroelectric SmC* phase can be obtained in about 3.5 hours.

The growth mechanism and ferroelectric domains of diisopropylammonium bromide films synthesized via 12-crown-4 addition at room temperature

2016 ◽  
Vol 18 (11) ◽  
pp. 7626-7631 ◽  
Author(s):  
Kaige Gao ◽  
Cong Xu ◽  
Zepeng Cui ◽  
Chuang Liu ◽  
Linsong Gao ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Growth Mechanism ◽  
Spontaneous Polarization ◽  
Room Temperature ◽  
High Curie Temperature ◽  
Ferroelectric Domains

Diisopropylammonium bromide (DIPAB) has attracted great attention as a molecular ferroelectric with large spontaneous polarization and high Curie temperature.

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