Relaxation dynamics of interphase FE-AFE boundaries

Ishchuk, V. M.

doi:10.1080/00150190108215007

Cited by 8 publications

(27 citation statements)

References 5 publications

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“…3, 9 and 10 in [16]). The discussed phenomenon is completely identical to the one in X/65/35 PLZT series when the La-content increases, and corresponds to the model Downloaded by [Bibliothèques de l'Université de Montréal] at 11:30 03 December 2014 diagram in Fig.7 in [2]. But in this case the ion substitution takes place in B-sites of perovskite crystal lattice.…”

Section: Phase States and Phase Transitions In Pmnsupporting

confidence: 59%

“…1a and is analogous to the model diagram in Fig. 7 in [2] (for systems with FE-AFE phase transitions). Therefore, one may state that at temperatures T < T c , PNM belongs to the AFE region of Y-T phase diagram and at temperatures below 220 K it belongs to the hysteresis region of FE-AFE states.…”

Section: Phase States and Phase Transitions In Pmnmentioning

confidence: 90%

“…Similarly to PLLZT and PLZT solid solutions, which relaxor properties are caused by weak energy difference of FE and AFE states and the coexisting of the said states domains in the volume of samples [2][3][4], the relaxor properties of PMN and related materials are defined by the same mechanism, too. The corresponding data can be found in the literature.…”

Section: Phase States and Phase Transitions In Pmnmentioning

confidence: 94%

“…The main result achieved in the frame of this approach is the expression which describes the dispersion of permittivity in the vicinity of the temperature corresponding to the maximum of the dependence ε(T). As shown in our paper [2], the whole set of physical phenomena observed in the substances such as (Pb,Li 1/2 -La 1/2 )(Zr,Ti)O 3 The applicability of the developed model conception for analysis of the behavior of real substances is demonstrated in [3] while analyzing the phase diagrams of PZT-based solid solutions and the experimental data on the behavior of the said substances under the action of external effects (temperature, hydrostatic pressure, electric field or any combination of these factors). The goal of the present paper is to show the suitability of the ideas of FE-AFE PT for explaining the whole of the complex of peculiarities in the behavior of PMN, PIN and their related substances.…”

Section: Introductionmentioning

confidence: 90%

“…The goal of the present paper is to show the suitability of the ideas of FE-AFE PT for explaining the whole of the complex of peculiarities in the behavior of PMN, PIN and their related substances. It seems expedient to read this paper after having acquainted oneself with the ideas considered in [2,3].…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

The Problem of Phase Transitions in PZT Based Solid Solutions, Pb(Mg 1/3 Nb 2/3 )O 3, Pb(In 1/2 Nb 1/2 )O 3 and "Relaxor Ferroelectricity." 2. Analysis of Experimental Results and Phase Diagrams for Pb(Mg 1/3 Nb 2/3 )O 3, Pb(B′ 1/2 B′′ 1/2 )O 3

Ishchuk

2003

Ferroelectrics

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Section: Phase States and Phase Transitions In Pmnsupporting

confidence: 59%

Section: Phase States and Phase Transitions In Pmnmentioning

confidence: 90%

Section: Phase States and Phase Transitions In Pmnmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

The Problem of Phase Transitions in PZT Based Solid Solutions, Pb(Mg 1/3 Nb 2/3 )O 3, Pb(In 1/2 Nb 1/2 )O 3 and "Relaxor Ferroelectricity." 2. Analysis of Experimental Results and Phase Diagrams for Pb(Mg 1/3 Nb 2/3 )O 3, Pb(B′ 1/2 B′′ 1/2 )O 3

Ishchuk

2003

Ferroelectrics

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Direct Visualization of Anti‐Ferroelectric Switching Dynamics via Electrocaloric Imaging

Vales-Castro

Vellvehı́

Perpiñà

et al. 2021

Adv Elect Materials

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or even the standard gas cooling cycle (50%). [1] First theorized in 1878 by William Thomson, [2] the high-temperature changes (ΔT = 12 K) calculated for ferroelectric (FE) thin films [3] and the discovery of an anomalous electrocaloric effect in anti-ferroelectrics (AFE) [3] have renewed its interest, with an eye put on its potential application as a solid-state cooling solution in integrated circuits.FE materials display what is regarded as the "conventional" electrocaloric effect (or positive electrocaloric effect), whereby the material increases temperature (ΔT > 0) when a voltage step is applied and decreases temperature (ΔT < 0) when it is removed. In contrast, AFE display the opposite response; they decrease temperature (ΔT < 0) when an electric field E is applied, and increase (ΔT > 0) when it is removed. The ability of anti-ferroelectrics to cool down despite electrostatic energy being pumped into them is intriguing, and different underlying mechanisms have been proposed for the negative electrocaloric effect. [4,5] Recent experimental evidence indicates that, in the archetypal anti-ferroelectric PbZrO 3 (PZO), the so-called giant negative electrocaloric effect is due to the latent heat absorbed during the adiabatic-field-induced AFE-FE transition, which is endothermic. [6] In PbZrO 3 , the direct link between the anomalous electrocaloric effect and the first-order anti-ferroelectric-ferroelectric switching implies that the field-induced nucleation and motion of the AFE-FE phase boundary will dictate the dynamics of the large negative ECE and, ultimately, the dynamics of electrocaloric devices based on first-order transitions. In ferroelectrics, the study of domain wall dynamics [7][8][9][10][11][12][13][14][15][16] has been examined in detail on account of their relevance for ferroelectric memories. In contrast, there are far fewer works regarding the dynamics of the ferroelectric-paraelectric phase boundaries in FE [17,18] or the anti-ferroelectric-ferroelectric ones in anti-ferroelectrics. [19][20][21][22][23] Yet, a priori, one cannot assume that the dynamics of domain walls will be the same as the dynamics of phase boundaries, while the former separate different domains within the same ferroelectric phase, the latter separate different phases-in antiferroelectrics, an antipolar phase from a field-induced polar one. Domain switching dynamics is defined by a nucleationpropagation process. On the one hand, nucleation refers to the appearance of "hotspots," where nanoscopic nuclei of switched domains appear and rapidly expand forward across the thickness The large electrocaloric coupling in PbZrO 3 allows using high-speed infrared imaging for visualizing anti-ferroelectric switching dynamics via the associated temperature change. It is found that in ceramic samples of homogeneous temperature and thickness, switching is fast due to the generation of multiple nucleation sites, with devices responding in the millisecond range. By introducing gradients of thickness, however, it is possible to change the dyn...

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Peculiarities of Ferro-Antiferroelectric Phase Transitions 9. Can the Substances with Coexisting Ferroelectric and Antiferroelectric Phases Mimic the Dipole-Glass Behavior?

Ishchuk¹,

Sobolev

2011

Ferroelectrics

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We demonstrate that the substances with coexisting ferroelectric and antiferroelectric phases possess properties characteristic for the "dipole glasses". Possible phase diagrams of such substances are discussed. Main attention is paid to the long-time relaxation of physical characteristics of these compounds after their thermodynamic equilibrium was disturbed by external influences. The long-time relaxation and the pronounced frequency dependence of parameters (for example, dependence of characteristics on the frequency of measuring field) are the main features due to which these systems are classified as dipole glasses. Our main purpose is to call attention to the fact that one has to be cautious during the interpretation of experimental results in substances with inhomogeneous states of coexisting domains of ferroelectric and antiferroelectric phases.

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Relaxation dynamics of interphase FE-AFE boundaries

Cited by 8 publications

References 5 publications

The Problem of Phase Transitions in PZT Based Solid Solutions, Pb(Mg 1/3 Nb 2/3 )O 3, Pb(In 1/2 Nb 1/2 )O 3 and "Relaxor Ferroelectricity." 2. Analysis of Experimental Results and Phase Diagrams for Pb(Mg 1/3 Nb 2/3 )O 3, Pb(B′ 1/2 B′′ 1/2 )O 3

The Problem of Phase Transitions in PZT Based Solid Solutions, Pb(Mg 1/3 Nb 2/3 )O 3, Pb(In 1/2 Nb 1/2 )O 3 and "Relaxor Ferroelectricity." 2. Analysis of Experimental Results and Phase Diagrams for Pb(Mg 1/3 Nb 2/3 )O 3, Pb(B′ 1/2 B′′ 1/2 )O 3

Direct Visualization of Anti‐Ferroelectric Switching Dynamics via Electrocaloric Imaging

Peculiarities of Ferro-Antiferroelectric Phase Transitions 9. Can the Substances with Coexisting Ferroelectric and Antiferroelectric Phases Mimic the Dipole-Glass Behavior?

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