A5045006059- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Dielectric materials and actuators
- Dielectric properties of ceramics
- Acoustic Wave Resonator Technologies
- Advanced ceramic materials synthesis
- Semiconductor materials and devices
- Energy and Environmental Systems
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Hydrogen Storage and Materials
- Semiconductor materials and interfaces
- Magnetic and transport properties of perovskites and related materials
- Perovskite Materials and Applications
- Synthesis and properties of polymers
- Intermetallics and Advanced Alloy Properties
- Advancements in Semiconductor Devices and Circuit Design
Tsinghua University
2012-2025
State Key Laboratory of New Ceramics and Fine Processing
2022-2025
University of Wollongong
2018-2021
We report a large and nonvolatile bipolar-electric-field-controlled magnetization at room temperature in Co(40)Fe(40)B(20)/Pb(Mg(1/3)Nb(2/3))(0.7)Ti(0.3)O(3) structure, which exhibits an electric-field-controlled looplike magnetization. Investigations on the ferroelectric domains crystal structures with situ electric fields reveal that effect is related to combined action of 109° ferroelastic domain switching absence magnetocrystalline anisotropy Co(40)Fe(40)B(20). This work provides route...
A strategy of mitigating polarization saturation is applied to enhance the energy storage properties Sn-modified NBT–ST relaxor ceramics.
Ceramic capacitors with ultrahigh power density are crucial in modern electrical applications, especially under high-temperature conditions. However, the relatively low energy limits their application scope and hinders device miniaturization integration. In this work, we present a high-entropy BaTiO3-based relaxor ceramic outstanding storage properties, achieving substantial recoverable of 10.9 J/cm3 superior efficiency 93% at applied electric field 720 kV/cm. Of particular importance is...
Abstract Dielectric capacitors with high energy storage performance are in great demand for emerging advanced applications. Relaxor ferroelectrics one type dielectric materials possessing density and efficiency simultaneously. In this study, 0.9(Sr 0.7 Bi 0.2 )TiO 3 –0.1Bi(Mg 0.5 Me )O (Me = Ti, Zr, Hf) relaxors designed the corresponding properties investigated. The excellent recoverable of 3.1 J/cm a 93% is achieved at applied electric field 360 kV/cm Hf (0.9SBT–0.1BMH) ceramic. High...
Sodium niobate (NaNbO3)-based lead-free ceramics have been actively studied for energy storage applications because of their antiferroelectric and/or relaxor features achieved in modified systems. The P-E loops NaNbO3-based are usually hysteretic the existence a metastable ferroelectric phase at room temperature. In this study, by introducing aliovalent cations and A-site vacancies, characteristics greatly enhanced (Na1-2xBix)(Nb1-xZrx)O3 ceramics, leading to high efficiency above 90%....
The market-dominating material BaTiO3 is highly crucial in advanced electronics and electric power systems owing to its fast charging/discharging speed superior cycle life. However, the low energy storage efficiency breakdown strength hinder further device miniaturization for applications. Herein, we design a high configurational entropy (HCE) BaTiO3-BiFeO3-CaTiO3 with rational microstructural engineering that demonstrates an ultrahigh density of 7.2 J cm−3. HCE leads increased solubility...
Lead-free relaxor ferroelectric ceramics are potential for energy storage applications due to their comprehensive properties. However, the efficiency of many is not high enough, leading Joule heat during charge–discharge cycles, thus lowering performance. In this work, tantalum (Ta) dopants were introduced into sodium niobate-based improve resistivity and efficiency. The leakage current was reduced by Ta doping, especially at electric field. enhanced attributed increased bandgap induced...
Due to the enhanced demand for numerous electrical energy storage applications, including applications at elevated temperatures, dielectric capacitors with optimized properties have attracted extensive attention. In this study, a series of lead-free strontium bismuth titanate based relaxor ferroelectric ceramics been successfully synthesized by high temperature solid-state reaction. The ultrahigh recoverable density 4.2 J/cm3 under 380 kV/cm, efficiency 88%, was obtained in sample x = 0.06....
The improvement in energy storage performance of ferroelectric (FE) materials requires both high electric breakdown strength and significant polarization change. phase-field method can couple the multi-physics-field factors. It realize simulation evolution. is widely used to reveal modification mechanism guide experimental design. Starting with models evolution, this work reviews latest theoretical progress on FE performance. Firstly, enhancement mechanisms are analyzed. Subsequently,...
Dielectric capacitors with high energy storage performance have been actively studied for emerging applications. In this work, a series of environmental friendly lead-free relaxor ferroelectric ceramics, (1 – x)(Ba0.75Sr0.25)TiO3–xBi(Mg0.5Hf0.5)O3 0 ≤ x 0.5 [abbreviated as x)BST–xBMH], were synthesized by high-temperature solid-state reaction method. The perovskite structure without any secondary phase can be obtained in samples 0.4. As the BMH content increases, polarization–electric field...
Abstract Electrostatic energy storage capacitors based on dielectrics have attracted much attention due to their wide applications in advanced electrical technology and electronic devices. Generally, high density is achieved at a electric field, while conduction loss becomes nonnegligible, which harms practical applications. Here distinctly suppressed leakage current BaZr 0.5 Ti O 3 ‐based films by entropy engineering realized. With increased entropy, the decreases two orders of magnitude...
Ceramic capacitors are ubiquitously used in high power and pulse applications, but their low energy density, especially at temperatures (>150 °C), limits fields of application. One the reasons is efficiency under electric and/or temperatures. In this work, equimolar Sm3+ Ti4+ cations were doped NaNbO3 to increase relaxor characteristics storage properties. The optimal recoverable density Wrec 6.5 J/cm3 η 96% attained ceramics with 10% (Sm, Ti) concentration (SmT10). Dense...
Abstract NaNbO 3 ‐based antiferroelectric ceramics are promising candidates for high‐performance energy storage capacitors due to their environmental friendliness and low cost despite current properties being inferior those of lead‐based AgNbO counterparts. Typically, the phase in is not stable characteristic double hysteresis loops seldom observed. In this work, antiferroelectricity was improved by reducing polarizability, resulting well‐developed 0.94NaNbO –0.06(K 0.5 Bi )SnO ceramics. To...
Herein, the (1 − x )(Sr 0.7 Bi 0.2 )TiO 3 – Bi(Mg 0.5 Hf )O (SBT–100 BMH, = 0.04–0.10) relaxor ferroelectric ceramics are fabricated via high‐temperature solid‐state reaction method. Dielectric and measurements reveal a typical characteristic with diffused frequency‐dependent dielectric peaks. The Weibull breakdown strength (BDS) of 470 kV cm −1 satisfied reliability is obtained by DC measurement. A maximum recoverable energy density 3.5 J −3 corresponding efficiency 92% simultaneously...
Dielectric ceramics with high polarization and low sintering temperature are important for high-performance low-cost multilayer ceramic capacitors (MLCCs). Herein, BiFeO3 was added to a lead-free composition 0.48BaTiO3-0.4Bi(Mg0.5Hf0.5)O3-0.12SrTiO3 lower the increase simultaneously. As result, of 950 °C comprehensive energy storage properties recoverable density Wrec 5.7 J/cm3 an efficiency η 92% at 450 kV/cm were achieved. Together good stability cycling η, exhibit great potential in MLCCs...
Polar topologies in ferroelectric/paraelectric superlattices have been an important substance to explore exotic physical properties. Although enormous efforts paid this field, the universality of formation polar various and their electric field dynamics is still unknown. Herein, we employ a phase-field model construct three types with tetragonal, rhombohedral, orthorhombic symmetries investigate static structures dynamic responses as function epitaxial strain. It found that all undergo...
Lead-free potassium sodium niobate (KNN)-based transparent ceramics are highly desirable owing to their excellent piezoelectricity, and recoverable energy storage density (Wrec) especially for optoelectronic devices. However, it is challenging achieve all parameters such as efficient light transmittance piezoelectricity or performance in a single device. Herein, we report facile fabrication of ceramic composed (1 – x)[(Na0.57K0.43)0.94Li0.06][(Nb0.94Sb0.06)0.95Ta0.05]O3-xCaZrO3 (x = 0, 0.01,...