The delay time of phase transition to the polar phase in relaxor ferroelectrics

2021 ◽  
Vol 575 (1) ◽  
pp. 50-55
Author(s):  
S. A. Migachev ◽  
T. S. Shaposhnikova ◽  
R. F. Mamin
Keyword(s):  
Phase Transition ◽  
Delay Time ◽  
Relaxor Ferroelectrics ◽  
Polar Phase

EVIDENCES OF A STRUCTURAL PHASE TRANSITION IN THE NEW Pb(ZryTi1 - y)O3 MODIFIED TELLURITE GLASS-CERAMIC COMPOSITE

2011 ◽  
Vol 01 (02) ◽  
pp. 185-190 ◽  
Author(s):  
J. D. S. GUERRA ◽  
C. R. HATHENHER
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Glass Ceramic ◽  
Ferroelectric Properties ◽  
Structural Phase ◽  
Polar Phase ◽  
X Ray Diffraction ◽  
System A ◽  
Glass Ceramic Composite ◽  
Quench Method

The physical properties of the new TeO 2 – B2O3 – PbO2 (TBP)-based glass system, obtained from the usual melt-quench method, have been investigated taking into account the influence of the Pb ( Zr y Ti 1 - y) O 3 (PZT) ferroelectric system. A crystalline-like structure, which characterizes a glass-ceramic-like state, promoted by the ferroelectric phase, has been revealed from the X-ray diffraction results for the sample with higher PZT concentration. On the other hand, results on the dielectric response revealed noticeable dielectric anomalies, which until now have not been reported. In fact, the dielectric and ferroelectric properties suggest the existence of a structural phase transition induced by the PZT crystalline phase, which indeed have been related to the ferroelectric polar-phase regions embedded into the glass matrix.

Phase transition in relaxor ferroelectrics studied by mechanical measurements

2003 ◽  
Vol 83 (21) ◽  
pp. 4384-4386 ◽  
Author(s):  
Feng Yan ◽  
Peng Bao ◽  
Yening Wang
Keyword(s):  
Phase Transition ◽  
Relaxor Ferroelectrics ◽  
Mechanical Measurements

LARGE ELECTROCALORIC EFFECT IN RELAXOR FERROELECTRICS

2012 ◽  
Vol 02 (03) ◽  
pp. 1230011 ◽  
Author(s):  
SHENG-GUO LU ◽  
QIMING ZHANG
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Electric Field ◽  
Vinylidene Fluoride ◽  
High Energy ◽  
Relaxor Ferroelectrics ◽  
Temperature Phase ◽  
Electrocaloric Effect ◽  
Heating And Cooling ◽  
Temperature Phase Transition

Organic and inorganic relaxor ferroelectrics used for electrocaloric effect (ECE) applications are introduced. Relaxor ferroelectrics offer several advantages for ECE devices, e.g., infinite states without applying electric field, field-induced large polarization, no-hysteresis of heating and cooling, small-hysteresis polarization loss, room temperature phase transition, and broad temperature range. The ECE in relaxor ferroelectrics under a high electric field can be described using a theory similar to that for first-order phase transition materials. Large ECE was observed directly in high-energy electron irradiated poly(vinylidene fluoride–trifluoroethylene) (P(VDF–TrFE)) 68/32 mol% copolymers, P(VDF–TrFE–CFE) (CFE-chlorofluoroethylene) 59.2/33.6/7.2 mol% terpolymers, P(VDF–TrFE–CFE)–P(VDF–CTFE) (CTFE-chlorotrifluoroethylene) 95/5 wt% terpolymer blended films, and (PbLa)(ZrTi)O3 (PLZT) ceramic thin films. ECE reported in Pb(Sc1/2Ta1/2)O3 (PST), Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) thin films is also summarized. Finally, the perspective of ECE devices is illustrated.

Evolution of Property and Microstructure of P(VDF-TrFE) Copolymers Modified by Irradiation Introduced Defects

2002 ◽  
Vol 734 ◽  
Author(s):  
Z.-Y. Cheng ◽  
Zhimin Li ◽  
Yanyun Ma ◽  
Q. M. Zhang ◽  
Fred B. Bateman
Keyword(s):  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Ferroelectric Phase ◽  
Critical Size ◽  
High Energy ◽  
Relaxor Ferroelectrics ◽  
Polar Phase ◽  
X Ray ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

ABSTRACTThe effect of defects introduced by high-energy electron irradiation on microstructure and properties in poly(vinylidene fluoride- trifluoroethylene) [P(VDF-TrFE)] is reported. In studies of the copolymers, it is found that as defect concentration increases, the material can be changed from a normal ferroelectrics to a relaxor ferroelectrics (RFE) and then to a simple relaxor. Correspondingly, the crystalline morphology changes from a coexistence of polar and non-polar phases to a macroscopically uniform non- polar phase, as revealed by x -ray data. It was observed that the dielectric property in the copolymers with a different amount of defects was well described by the Vogel-Fulcher (V-F) relationship. Based on the experimental data, a critical size, which is the smallest size of crystal with ferroelectric phase, of about 5 nm was obtained for the copolymer. The RFE developed here exhibits a massive electrostrictive strain which is very attractive for many actuator and transducer applications and a high dielectric constant which is attractive for development of high- density energy storage capacitors and electronic packaging.

scholarly journals Индуцированный фазовый переход в монокристаллических твердых растворах PbMg-=SUB=-1/3-=/SUB=-Nb-=SUB=-2/3-=/SUB=-O-=SUB=-3-=/SUB=--29PbTiO-=SUB=-3-=/SUB=- и PbZn-=SUB=-1/3-=/SUB=-Nb-=SUB=-2/3-=/SUB=-O-=SUB=-3-=/SUB=--9PbTiO-=SUB=-3-=/SUB=-: сходство и различие

2021 ◽  
Vol 63 (11) ◽  
pp. 1880
Author(s):  
Л.С. Камзина
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Low Temperature ◽  
Electric Fields ◽  
Delay Time ◽  
Optical Transmission ◽  
Ferroelectric Phase ◽  
Morphotropic Phase Transition ◽  
Macroscopic Polarization ◽  
Kinetics Of

The kinetics of the induced phase transition in single-crystal relaxor solid solutions PbMg1 / 3Nb2 / 3O3-29PbTiO3 and PbZn1 / 3Nb2 / 3O3-9PbTiO3 is studied when an electric field is applied along the [001] direction. At temperatures below the temperature of the morphotropic phase transition, the changes in the dielectric constant and optical transmission in electric fields are studied. It is shown that the decrease in optical transmission with time is associated only with a change in the sizes of nanoregions during the phase transition. It was found that the induced phase transition proceeds differently in these crystals. In PMN-29PT crystals, the formation of ferroelectric phases and the rapid establishment of macroscopic polarization are preceded by a certain delay time, while in PZN-9PT crystals, the ferroelectric phase is induced immediately after the application of the field without a delay time. The results obtained are explained by the different structures of the low-temperature phases in these compounds. Key words: ferroelectricity, relaxors, induced phase transition.

Mechanism of Diffuse Phase Transition in Relaxor Ferroelectrics

1994 ◽  
Vol 33 (Part 1, No. 4A) ◽  
pp. 1959-1964 ◽  
Author(s):  
Takaaki Tsurumi ◽  
Kouji Soejima ◽  
Toshio Kamiya ◽  
Masaki Daimon
Keyword(s):  
Phase Transition ◽  
Diffuse Phase Transition ◽  
Relaxor Ferroelectrics ◽  
Diffuse Phase

scholarly journals Observation of generalized Kibble-Zurek mechanism across a first-order quantum phase transition in a spinor condensate

2020 ◽  
Vol 6 (21) ◽  
pp. eaba7292
Author(s):  
L.-Y. Qiu ◽  
H.-Y. Liang ◽  
Y.-B. Yang ◽  
H.-X. Yang ◽  
T. Tian ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Power Law ◽  
Quantum Phase Transition ◽  
Scaling Laws ◽  
Quantum Phase Transitions ◽  
Quantum Phase ◽  
Polar Phase ◽  
First Order ◽  
Spin Excitations

The Kibble-Zurek mechanism provides a unified theory to describe the universal scaling laws in the dynamics when a system is driven through a second-order quantum phase transition. However, for first-order quantum phase transitions, the Kibble-Zurek mechanism is usually not applicable. Here, we experimentally demonstrate and theoretically analyze a power-law scaling in the dynamics of a spin-1 condensate across a first-order quantum phase transition when a system is slowly driven from a polar phase to an antiferromagnetic phase. We show that this power-law scaling can be described by a generalized Kibble-Zurek mechanism. Furthermore, by experimentally measuring the spin population, we show the power-law scaling of the temporal onset of spin excitations with respect to the quench rate, which agrees well with our numerical simulation results. Our results open the door for further exploring the generalized Kibble-Zurek mechanism to understand the dynamics across first-order quantum phase transitions.

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