Strain-Gradient-Controlled Disorder Dynamics in Chemically Substituted Ferroelectrics

Tan, Ping‐Heng; Tian, Hao; Huang, Fei; Meng, Xiangda; Wang, Yu; Cao, Xilong; Li, Li; Zhou, Zhongxiang

doi:10.1103/physrevapplied.11.024037

Cited by 33 publications

(17 citation statements)

References 64 publications

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“…where s ¼ s(T) is the Fröhlich entropy for the unitary volume and field. 8,43,44 Equation ( 1) shows that the application of E increases the entropy if s(T) . 0 and decreases the entropy if s(T) , 0.…”

Section: B Dielectric Measurementsmentioning

confidence: 99%

Evidence of double-loop hysteresis in disordered ferroelectric crystal

Parravicini

Fornasari

DelRe

et al. 2020

Journal of Applied Physics

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Double-loop electric-field vs polarization hysteresis is investigated in a depoled compositionally disordered lithium-enriched potassium tantalate niobate crystal. Comparing electro-optic response and dielectric spectroscopy indicates that the anomalous response occurs for those temperatures in which the sample also manifests a temperature hysteresis in the low-frequency dielectric function. An electric-field hysteresis at concurrent temperatures suggests an underlying role of reorienting mesoscopic polar regions that accompany the nonergodic phase.

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Section: B Dielectric Measurementsmentioning

confidence: 99%

Evidence of double-loop hysteresis in disordered ferroelectric crystal

Parravicini

Fornasari

DelRe

et al. 2020

Journal of Applied Physics

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“…[25]. The coexistence of flexo-and ferro-electric effects have been discussed in many papers [34][35][36][37][38][39][40][41][42][43][44]. Catalan et al [34] showed, by numerical calculations of the Landau-Ginzburg-Devonshire free energy, that the maximum dielectric constant of ferroelectric thin films decreases by the flexoelectric effect and that the polarization at room temperature increases by the flexoelectric effect.…”

Section: Introductionmentioning

confidence: 99%

Coexistence of Flexo- and Ferro-Electric Effects in an Ordered Assembly of BaTiO3 Nanocubes

et al. 2022

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It has been reported that the flexoelectric effect could be dominant in the nanoscale. The discrepancy between theory and experiments on the frequency dependence of the dielectric constant of an ordered assembly of BaTiO3 nanocubes is nearly resolved by assuming the coexistence of flexo- and ferro-electric effects. Although flexoelectric polarizations perpendicular to the applied alternating electric field contribute to the dielectric constant, those parallel to the electric field do not contribute because the magnitude of the flexoelectric polarization does not change due to the mismatch of strain at the interface of the nanocubes. On the other hand, some dielectric response is possible for the ferroelectric component of the polarization parallel to the electric field.

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“…Specifically, Fröhlich considered an ideal dielectric undergone to an electric field. He was able to provide equations correlating the induced internal total energy, the entropy variation, the Helmholtz free energy with the dielectric quantities of the given material; they are called, respectively, Fröhlich total energy, Fröhlich entropy (FE), and Fröhlich free energy [35][36][37]. The most important result of these, however, is the estimation of the entropy induced by the application of a static electric field.…”

Section: Introduction and Landscapementioning

confidence: 99%

“…ferroelectric and glassy perovskites [35,37,[48][49][50][51], polar glasses [52], polar and glass-forming liquids [27,[53][54][55][56], polymeric films [57], enzymes [58]. The use of Fröhlich's theory in describing so different systems demonstrates that employing its approach represents a powerful technique which, through the description of the order state, may give specific information on the temperature evolution of mesoscopic and microscopic physical systems.…”

Section: Introduction and Landscapementioning

confidence: 99%

Comprehensive review on Froehlich entropy estimation: a technique to investigate the state of order in condensed matter

Parravicini¹,

Parravicini²

2021

Preprint

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The so-called Fröhlich entropy is the entropy variation of a material under the application of an electric field. This quantity can be calculated, under suitable hypotheses, directly from the measured real part of the dielectric function. Although Fröhlich entropy is defined for a biased sample, a straightforward physical interpretation correlates it to the state of order of the considered physical system in absence of field. When Fröhlich entropy is calculated from experimental results, its trend is able to give several information about the evolution in temperature of the explored compound, especially of its phase transition features. We here provide a comprehensive review of the physical systems (dipolar liquids and nematicons, organic molecular crystals, metallic nanoparticles, inorganic disordered ferroelectrics, etc.) where this approach has been exploited with the aim of evaluating their state of order. The variety of compounds where this method has been applied demonstrates that the estimation of the Fröhlich entropy can be considered

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Strain-Gradient-Controlled Disorder Dynamics in Chemically Substituted Ferroelectrics

Cited by 33 publications

References 64 publications

Evidence of double-loop hysteresis in disordered ferroelectric crystal

Evidence of double-loop hysteresis in disordered ferroelectric crystal

Coexistence of Flexo- and Ferro-Electric Effects in an Ordered Assembly of BaTiO3 Nanocubes

Comprehensive review on Froehlich entropy estimation: a technique to investigate the state of order in condensed matter

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