Role of point defects in the formation of relaxor ferroelectrics

Hong, Zhengkai; Ke, Xiaoqin; Wang, Dong; Yang, Shengchun; Ren, Xiaobing

doi:10.1016/j.actamat.2021.117558

Cited by 32 publications

(14 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The c̅ = 0.6 sample shows the highest W rec value, and the relatively low P r value may attribute to the fact that most of the PNRs reverse back to the initial orientation when the electric field is removed, as exhibited in Figure S1. The emergency of PNDs with the increase of c̅ is related to the local ferroelectric transition, and the variation tendency is exhibited in Figure c . It can be concluded that a good balance between W rec and η should be achieved simultaneously in the sample with the coexistence of PNRs and PNDs, where the PNRs dominate the system and a small number of PNDs promote the polarization value.…”

Section: Resultsmentioning

confidence: 92%

“…The emergency of PNDs with the increase of c ̅ is related to the local ferroelectric transition, and the variation tendency is exhibited in Figure 1c. 36 It can be concluded that a good balance between W rec and η should be achieved simultaneously in the sample with the coexistence of PNRs and PNDs, where the PNRs dominate the system and a small number of PNDs promote the polarization value. The above methodology provides a good guidance for the following experimental conduction.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr_0.7Bi_0.2TiO₃-Based Relaxors via Polarization Behavior Modulation

Wang

Kang

Hong

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Dielectric capacitors possessing the inherent superiorities of high power density and ultrafast charge–discharge speed make their utilization in energy-storage devices extremely propitious, although the relatively low recoverable energy-storage density (W rec) may impede their applications. In this work, unlike the mainstream approach of destroying long-range ferroelectric/antiferroelectric order and inducing relaxor properties to achieve a high W rec value, we have selected end members with a high polarization gene to promote the polarization behavior of the typical relaxor Sr0.7Bi0.2TiO3. Therefore, an ultrahigh W rec ∼ 8 J/cm3 and a superior efficiency (η) ∼ 91% are accomplished in the 0.98[0.56(Sr0.7Bi0.2)TiO3-0.44(Bi0.5Na0.5)TiO3]-0.02 Bi(Mg0.5Ti0.5)O3 sample. The achieved W rec value is record high in Sr0.7Bi0.2TiO3-based systems as far as we know. The polarization-enhancement behavior can be explained by the phase field simulation results, phase content variance in X-ray diffraction Rietveld refinement, hardening trend in Raman spectroscopy, domain morphology, and local symmetry in transmission electron microscope analysis. Meanwhile, the ceramic possesses excellent thermal stability (ΔW rec < 12.7% and Δη < 10.4%, −50–200 °C), frequency (ΔW rec < 2.69% and Δη < 2.06%, 0.5–500 Hz), and fatigue-resistant stability (ΔW rec < 0.08% and Δη < 0.2%, up to 1 × 105 cycles). Accordingly, this work proposes a design idea to tailor the polarization behavior and energy-storage properties of typical relaxors.

show abstract

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr_0.7Bi_0.2TiO₃-Based Relaxors via Polarization Behavior Modulation

Wang

Kang

Hong

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…Notably, the variable of c ̅ mimics SBT content variation to simplify simulations and thus corresponds to polarity evolution. 38 Figure S8b represents the electrostrictive strain with different c ̅ . As c ̅ decreases (increase in polarity), the electrostrictive strain increases and reaches the maximum value for c ̅ = 0.5.…”

Section: Resultsmentioning

confidence: 99%

“…The S – E loop with different defect concentrations ( c ̅) is calculated and shown in Figure S8a. Notably, the variable of c ̅ mimics SBT content variation to simplify simulations and thus corresponds to polarity evolution Figure S8b represents the electrostrictive strain with different c ̅.…”

Section: Resultsmentioning

confidence: 99%

Polarity Modulation Induced High Electrostrain Performance with Near-Zero Hysteresis in a (Sr_0.7Bi_0.2□0.1)TiO₃-Based System

Hong

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

High-precision piezo actuators necessitate dielectrics with high electrostrain performance with low hysteresis. Polarity-modulated (Sr 0.7 Bi 0.2□0.1 )-TiO 3 -based ceramics exhibit extraordinarily discrete multiphase coexistence regions: (i) the relaxor phase coexistence (RPC) region with local weakly polar tetragonal (T) and pseudocubic (Pc) short-range polar nanodomains and (ii) the ferroelectric phase coexistence (FPC) region with T long-range domains and Pc nanodomains. The RPC composition features a specially high and pure electrostrain performance with nearzero hysteresis (S ∼ 0.185%, Q 33 ∼ 0.038 m 4 •C −2 ), which is double those of conventional Pb(Mg 1/3 Nb 2/3 )O 3 -based ceramics. Particular interest is paid to the RPC and FPC with multiscale characterization to unravel local structure−performance relationships. Guided by piezoelectric force microscopy, scanning transmission electron microscopy, and phase-field simulations, the RPC composition with multiphase low-angle weakly polar nanodomains shows local structural heterogeneity and contributes to a flat local free energy profile and thus to nanodomain switching and superior electrostrain performance, in contrast to the FPC composition with a macroscopic domain that shows stark hysteresis. This work provides a paradigm to design high-precision actuator materials with large electrostrain and ultralow hysteresis, extending our knowledge of multiphase coexistence species in ferroelectrics.

show abstract

“…that domain morphology cannot be well discriminated by PFM [3,4,9,30]. The local random field enhanced by high entropy greatly destroys the long-range ordered ferroelectric state, driving the evolution of domain structure from largescale domains to small-scale domains and even PNRs, which results in a large improvement of W rec and η owing to the enhanced activity and response speed under external electric field [3,4,31]. Furthermore, on the basis of PFM amplitude results, the maximum amplitude shows a downward trend on the whole, indicating reduced ferroelectric activity and enhanced relaxation behavior by increasing entropy.…”

Section: Evolution Of Domain Structure Versus Configuration Entropymentioning

confidence: 99%

Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics

Chen

et al. 2023

Nano-Micro Lett.

111

View full text Add to dashboard Cite

Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market. Here, an ultrahigh energy storage density of ~ 13.8 J cm−3 and a large efficiency of ~ 82.4% are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy, named high-entropy strategy, realizing nearly ten times growth of energy storage density compared with low-entropy material. Evolution of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first time. The achievement of excellent energy storage properties should be attributed to the enhanced random field, decreased nanodomain size, strong multiple local distortions, and improved breakdown field. Furthermore, the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also realized. The significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics, promoting the development of advanced capacitors "Image missing".

show abstract

Role of point defects in the formation of relaxor ferroelectrics

Cited by 32 publications

References 42 publications

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr_0.7Bi_0.2TiO₃-Based Relaxors via Polarization Behavior Modulation

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr_0.7Bi_0.2TiO₃-Based Relaxors via Polarization Behavior Modulation

Polarity Modulation Induced High Electrostrain Performance with Near-Zero Hysteresis in a (Sr_0.7Bi_0.2□0.1)TiO₃-Based System

Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics

Contact Info

Product

Resources

About

Role of point defects in the formation of relaxor ferroelectrics

Cited by 32 publications

References 42 publications

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr0.7Bi0.2TiO3-Based Relaxors via Polarization Behavior Modulation

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr0.7Bi0.2TiO3-Based Relaxors via Polarization Behavior Modulation

Polarity Modulation Induced High Electrostrain Performance with Near-Zero Hysteresis in a (Sr0.7Bi0.2□0.1)TiO3-Based System

Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics

Contact Info

Product

Resources

About

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr_0.7Bi_0.2TiO₃-Based Relaxors via Polarization Behavior Modulation

Achieving Ultrahigh Energy-Storage Density with Excellent Thermal Stability in Sr_0.7Bi_0.2TiO₃-Based Relaxors via Polarization Behavior Modulation

Polarity Modulation Induced High Electrostrain Performance with Near-Zero Hysteresis in a (Sr_0.7Bi_0.2□0.1)TiO₃-Based System