Identification of defect distribution at ferroelectric domain walls from evolution of nonlinear dielectric response during the aging process

Mokrý, Pavel; Sluka, Tomáš

doi:10.1103/physrevb.93.064114

Cited by 16 publications

(13 citation statements)

References 41 publications

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“…Actually, the elastic interaction of the adjacent domain under the application of the external electric field results in "smearing" the sharp interface between domains, which is of a sub-nanometer scale in BT single crystal. Nevertheless, the numerical phase-field simulations of the similar system 26 indicates that the stray elastic fields in the domain wall regions does not affect the DHM result.…”

Section: Discussionmentioning

confidence: 93%

Ferroelectric domain pattern in barium titanate single crystals studied by means of digital holographic microscopy

Mokrý¹,

Psota²,

Steiger³

et al. 2016

J. Phys. D: Appl. Phys.

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In this Article, we report on the observation of ferroelectric domain pattern in the whole volume of the ferroelectric barium titanate single crystal by means of the digital holographic microscopy (DHM). Our particular implementation of DHM is based on the Mach-Zehnder interferometer and the numerical processing of data employs the angular spectrum method. A modification of the DHM technique, which allows a fast and accurate determination of the domain walls, i.e. narrow regions separating the antiparallel domains, is presented. Accuracy and sensitivity of the method are discussed. Using this approach, the determination of important geometric parameters of the ferroelectric domain patterns (such as domain spacing or the volume fraction of the anti-parallel domains) is possible. In addition to the earlier DHM studies of domain patterns in lithium niobate and lithium tantalate, our results indicate that the DHM is a convenient method to study a dynamic evolution of ferroelectric domain patterns in all perovskite single crystals.

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Section: Discussionmentioning

confidence: 93%

Ferroelectric domain pattern in barium titanate single crystals studied by means of digital holographic microscopy

Mokrý¹,

Psota²,

Steiger³

et al. 2016

J. Phys. D: Appl. Phys.

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“…While for nonlinear dielectric behavior of samples with defect dipoles, traditional Rayleigh law is not suitable for fitting. A complex model has been proposed to study the relation between dielectric nonlinearity and defect‐induced aging effect, 23 but only 180° DW is taken into account, the case of which is far from reality. A phenomenological thermodynamic model has been proposed to explain the nonlinear response of PZT thin films, 24 but the nonlinearity at small electric field region has not been concerned.…”

Section: Resultsmentioning

confidence: 99%

Effects of defect dipoles on tunable dielectric response in relaxor ferroelectric ceramics

Wang

Yang

et al. 2020

J Am Ceram Soc

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Tunable dielectric materials have drawn much attention due to their wide applications including capacitors and microwave tunable devices. Ferroelectrics materials have special spontaneous polarization which can be reversibly switched by an external electric field. Therefore, tunable dielectric constant can be easily achieved in ferroelectrics. However, the study of nonlinear dielectric response induced by defect dipoles is rarely concerned. Here, we report the effects of defect dipoles on tunable dielectric response under alternative current (AC) and direct current (DC) electric field in defect dipoles introduced Pb(Lu1/2Nb1/2)O3–PbTiO3 ceramics. A modified Rayleigh model is proposed to successfully characterize dielectric nonlinearity and reveals the interaction between domain walls and defect dipoles. The defect dipoles had more sensitive effect on dielectric response under AC field than that of defect dipoles‐free samples. The drop of intrinsic dielectric contribution under AC field results from the detriment effect of defect dipoles. The irreversible contribution is altered by the movements of defect dipoles under AC field, subsequently inducing the nonlinearity of dielectric response. Samples with defect dipoles have larger tunable scope of dielectric properties than that of defect dipoles‐free samples. The present work discovers the potential of application of defect dipoles‐tuned dielectric response ferroelectrics in devices which requires both high AC and DC biases, and help to better understand the complex dielectric response of ferroelectrics.

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“…Here,

is the electric potential and

[ 20 ] is the background dielectric constant due to nonpolar ions. The free energy functional describing the ferroelectric phase transition in a strained PTO has the form of the Ginzburg–Landau functional for a ferroelectric layer subjected to an electric field [ 21 ], and is written in the form [ 22 ] (the gradient and electrostatic terms are included):

where F is the free energy density; each of the indices i , j , k , l cyclically takes values of 1, 2 or 3 (or x , y , z ).…”

Section: Methodsmentioning

confidence: 99%

Temperature Dependence of Dielectric Properties of Ferroelectric Heterostructures with Domain-Provided Negative Capacitance

et al. 2021

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It is well known that the ferroelectric layers in dielectric/ferroelectric/dielectric heterostructures harbor polarization domains resulting in the negative capacitance crucial for manufacturing energy-efficient field-effect transistors. However, the temperature behavior of the characteristic dielectric properties, and, hence, the corresponding behavior of the negative capacitance, are still poorly understood, restraining the technological progress thereof. Here we investigate the temperature-dependent properties of domain structures in the SrTiO3/PbTiO3/SrTiO3 heterostructures and demonstrate that the temperature–thickness phase diagram of the system includes the ferroelectric and paraelectric regions, which exhibit different responses to the applied electric field. Using phase-field modeling and analytical calculations we find the temperature dependence of the dielectric constant of ferroelectric layers and identify the regions of the phase diagram wherein the system demonstrates negative capacitance. We further discuss the optimal routes for implementing negative capacitance in energy-efficient ferroelectric field-effect transistors.

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Identification of defect distribution at ferroelectric domain walls from evolution of nonlinear dielectric response during the aging process

Cited by 16 publications

References 41 publications

Ferroelectric domain pattern in barium titanate single crystals studied by means of digital holographic microscopy

Ferroelectric domain pattern in barium titanate single crystals studied by means of digital holographic microscopy

Effects of defect dipoles on tunable dielectric response in relaxor ferroelectric ceramics

Temperature Dependence of Dielectric Properties of Ferroelectric Heterostructures with Domain-Provided Negative Capacitance

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