The Experts below are selected from a list of 49644 Experts worldwide ranked by ideXlab platform
Jiwei Zhai - One of the best experts on this subject based on the ideXlab platform.
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significantly enhanced Energy Storage Density and efficiency of bnt based perovskite ceramics via a site defect engineering
Energy Storage Materials, 2020Co-Authors: Fei Yan, Bo Shen, Kaiwei Huang, Tao Jiang, Xiaofeng Zhou, Yunjing Shi, Jiwei ZhaiAbstract:Abstract In recent years, sodium bismuth titanate (Bi0.5Na0.5TiO3, BNT) -based relaxor ferroelectrics have attracted more and more attention for Energy Storage applications owing to their high power Density, large saturated polarization (PS)/maximum polarization (Pmax) as well as meeting the needs of environment-friendly society. However, the recoverable Energy Storage Density (Wrec) and Energy Storage efficiency (η) of most BNT-based relaxor ferroelectric ceramics are lower than 3.5 J cm−3 and/or 80%, respectively, in recently. In this work, the relaxor ferroelectric ceramics of 0.75Bi(0.5+x)Na(0.5-x)TiO3-0.25SrTiO3 (BNST-x) were constructed via A-site defect engineering and prepared by tape-casting method. It is worth noting that an ultrahigh Wrec of 5.63 J cm−3 together with outstanding η of 94% can be achieved simultaneously at a relative high electric field of 535 kV cm−1 with the composition of BNST-0.08, Meanwhile, for BNST-0.08 ceramic, the η is higher than 90% and the variation of Wrec is less than ±2% and ±5% within the frequency range of 1–100 Hz and temperature range of 30–130 °C, respectively. The Wrec is always higher than 3 J cm−3 and did not deteriorate significantly after 104 fatigue cycles. In addition, the BNST-0.08 ceramic also possesses ultrafast discharge speed (t0.9, less than 125 ns) and ultrahigh power Density (PD, higher than 147 MW cm−3) within the temperature range of 30–130 °C at 300 kV cm−1. Therefore, the BNST-0.08 ceramic is promising candidate environment-friendly materials for advanced pulsed power capacitor applications and the Energy Storage properties of BNT-based relaxor ferroelectrics can be enhanced significantly via A-site defect engineering.
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multifunctionality of lead free bifeo3 based ergodic relaxor ferroelectric ceramics high Energy Storage performance and electrocaloric effect
Journal of Alloys and Compounds, 2019Co-Authors: Jiwei Zhai, Bo Shen, Huarong Zeng, Xiaodong JianAbstract:Abstract With industrializations speeding up, the need for materials with multiple functions are growing because of ever-increasing complexity of electronic devices. The BiFeO3- based ferroelectric relaxor ceramic as a multifunctional material has been ignored thus far. This work innovatively investigates the multifunctionality in a novel lead-free BiFeO3-BaTiO3-(Sr0.7Bi0.2)TiO3 relaxor ferroelectric ceramics since a high Energy Storage performance and electrocaloric effect are simultaneously obtained. Results show that a large adiabatic temperature change ΔT∼1.44 K is achieved. The total Energy Storage Density (WS) reaches to ∼2.34 J/cm3, recoverable Energy Storage Density (WR) are ∼1.74 J/cm3, accompanied by a high efficiency η∼74%. The charge- discharge characterizations indicate that this ceramic possesses an ultrahigh current Density of 1184.7 A/cm2 and power Density of 59.2 MW/cm3. In particular, the discharging speed is ultra-fast and the discharging period τ is in range of 25–30 ns at room temperature. This work strongly indicates that the studied ceramic is a promising candidate in multifunctional applications such as cooling devices and pulsed power electronics and also enrich the species of the lead-free materials in multifunctionality.
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structure design strategy of 0 3 type bi0 32sr0 42na0 20 tio3 mgo composite to boost Energy Storage Density efficiency and charge discharge performance
Journal of The European Ceramic Society, 2019Co-Authors: Huarong Zeng, Bo Shen, Feng Li, Jie Wang, Jiwei ZhaiAbstract:Abstract A novel 0–3 type (Bi0.32Sr0.42Na0.20)TiO3/MgO composite is investigated in this work, which possesses a high stored Energy Storage Density ws˜2.50 J/cm3, recoverable Energy Storage Density WR˜2.09 J/cm3 with high efficiency η˜84% under low electric field (20 kV/mm). The excellent performance is owning to the increase of breakdown strength (BDS) value and the intrinsic mechanism for enhanced BDS value by MgO incorporation is disclosed by numerical simulations (COMSOL). Moreover, the studied composite exhibits excellent charge-discharge performance, the current Density (CD) and power Density (PD) are 1671 A/cm2 and 150 MW/cm3, respectively, which are much superior to that of other ceramics. Besides, most of the stored Energy is discharged within ˜0.15 μs via charge-discharge tests. This work not only provides a novel technique to designing bismuth-based ceramic capacitors with simultaneously high Wd, η and excellent charge-discharge performance, but also deepens the understandings of the role for the metallic oxide in the composite.
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antiferroelectric thick film grown on metal foils with fast discharge speed and excellent Energy Storage properties
Journal of Materials Science: Materials in Electronics, 2019Co-Authors: Ying Zhang, Xihong Hao, Ningning Sun, Haitao Jiang, Jiwei ZhaiAbstract:Antiferroelectric (AFE) Pb0.94La0.04Zr0.97Ti0.03O3 (PLZT) thick film was successfully fabricated on nickel foils by using sol–gel method. The film exhibits dense microstructure with low surface roughness and pure perovskite phase. It displays high dielectric constant of 433 at 100 kHz and room temperature, which is 28% larger than that on traditional silicon substrate. Calculated by polarization-field (P–E) hysteresis loop, the recoverable Energy-Storage Density (Wrec) of 18.4 J/cm3 and the efficiency (Ƞ) value of 54% at 1400 kV/cm are obtained in the thick film. Measured by resistance–inductance–capacitance (RLC) circuit, the maximum pulsed discharge Energy-Storage Density (Wdis) of 12.4 J/cm3 is found at the same electric field of 1400 kV/cm. Moreover, 90% of the Energy is released in a short time of about 84 ns, displaying super-fast discharging characteristic. The AFE film with high discharge Energy-Storage Density and fast discharge time provides strong potential for the application in modern electronics and electrical power systems.
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Achieving high discharge Energy Density and efficiency with NBT-based ceramics for application in capacitors
Journal of Materials Chemistry C, 2019Co-Authors: Di Hu, Bo Shen, Yang Zhang, Jiwei ZhaiAbstract:High-performance capacitors, which have high Energy Storage Density as well as high discharge efficiency, are desired. In this study, we have designed and prepared novel and high quality (1 − x)(0.65Bi0.5Na0.5TiO3–0.35Bi0.1Sr0.85TiO3)–x(K0.5Na0.5NbO3) [(1 − x)(BNT–BST)–xKNN, x = 0, 0.04, 0.06, 0.08, and 0.10] ceramics that demonstrated a remarkable Energy Storage capability, high efficiency, and ultrafast discharge speed. Particularly, the 0.94(BNT–BST)–0.06KNN ceramic possessed an excellent stored Energy Storage Density (Ws = ∼3.13 J cm−3) and recoverable Energy Storage Density (Wr = ∼2.65 J cm−3), and maintained a relatively high efficiency (η = ∼84.6%) at a relatively low electric field of 180 MV m−1, which is superior to those of the lead-free BNT-based Energy-Storage materials. Moreover, excellent temperature (20–120 °C) and frequency (1–100 Hz) stabilities of the 0.94(BNT–BST)–0.06KNN ceramic were also achieved. More importantly, the 0.94(BNT–BST)–0.06KNN ceramic exhibited an ultrafast discharge rate (τ0.9 = ∼1.01 μs), a high level of discharge Energy Density (Wd −1.21 J cm−3), and excellent reliability in Energy Storage performance by consecutive cycling. Moreover, this study also provides an effective approach to attain large Energy-Storage capability along with high efficiency in BNT-based ceramics for application in pulsed power capacitors.
Xianlin Dong - One of the best experts on this subject based on the ideXlab platform.
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a novel lead free and high performance barium strontium titanate based thin film capacitor with ultrahigh Energy Storage Density and giant power Density
Journal of Materials Chemistry C, 2020Co-Authors: Yuzhu Fan, Zhiyong Zhou, Ying Chen, Wei Huang, Xianlin DongAbstract:High-performance lead-free film capacitors with simultaneously large Energy Storage Density and high power Density are strongly demanded in applications. Here, a novel relaxor-ferroelectric 0.88Ba0.55Sr0.45TiO3–0.12BiMg2/3Nb1/3O3 (BST–BMN) thin film capacitor was obtained with an ultrahigh recoverable Energy Storage Density (Wrec) of ∼86 J cm−3 and high efficiency of ∼73% under the dielectric breakdown strength of 5 MV cm−1. In addition, the investigated thin film capacitor exhibited an excellent fatigue resistance property with the Wrec variation less than ∼2% after 107 cycles. More importantly, a considerable power Density of ∼208 MW cm−3 was obtained in BST–BMN thin film capacitors, which is superior to many other thin film capacitors. These remarkable performances should be attributed to the simultaneously enhanced BDS and relaxor behavior through the incorporation of non-isovalent ions. These results qualify the environment-benign BST–BMN thin films as promising candidates for Energy Storage applications and promote the development of BST-based film capacitors with enhanced Wrec in the future.
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designing novel lead free nanbo3 based ceramic with superior comprehensive Energy Storage and discharge properties for dielectric capacitor applications via relaxor strategy
Journal of The European Ceramic Society, 2019Co-Authors: Yuzhu Fan, Zhiyong Zhou, Ruihong Liang, Xianlin DongAbstract:Abstract There are urgent demands for high performance capacitors with superior Energy Storage Density and discharge performances. In this work, novel NaNbO3-based lead-free ceramics (0.91NaNbO3-0.09Bi(Zn0.5Ti0.5)O3) with high Energy Storage capability, high power Density and fast discharge speed were designed and prepared. Bi(Zn0.5Ti0.5)O3 was chosen for the purpose to reduce the remnant polarization and improve the induced polarization. Consequently, a large stored Energy Storage Density (Ws˜ 3.51 J/cm3) and high recoverable Energy Storage Density (Wrec˜ 2.20 J/cm3) were obtained in 0.91NaNbO3-0.09Bi(Zn0.5Ti0.5)O3 ceramic under a high breakdown strength of 250 kV/cm, with excellent thermal stability in the range of 20–120 °C. More importantly, the investigated ceramics exhibited high power Density (PD˜ 20 MW/cm3) and ultrafast discharge rate (t0.9˜ 0.25 μs), demonstrating potential application in pulse powehr systems. This work provides an effective means of achieving excellent Energy Storage and discharge performances in NaNbO3-based ceramics for application in dielectric capacitors.
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enhanced Energy Storage properties in sodium bismuth titanate based ceramics for dielectric capacitor applications
Journal of Materials Chemistry C, 2019Co-Authors: Yuzhu Fan, Xianlin Dong, Mingxing Zhou, Fei Cao, Ningtao Liu, Ping Peng, Shiguang Yan, Genshui WangAbstract:There are imperious demands for developing eco-benign Energy Storage materials with high-performance in a sustainable society. In this paper, we introduce Sr0.85Bi0.1□0.05TiO3 (SBT) and NaNbO3 (NN) into Bi0.5Na0.5TiO3 (BNT) ceramics through compositional design. The introduction of Sr2+ ions and vacancies at the A-sites constructs relaxor ferroelectrics according to order–disorder theory. The introduction of Nb5+ ions at the B-sites is confirmed to have two major implications. In one way, it boosts a higher induced polarization due to its intrinsic larger polarizability and overall stronger degree of diffuseness. In another, it contributes to forming a core–shell microstructure, as proven using transmission electron microscopy, promoting the breakdown strength (BDS) to a higher level. With the above strategies, our BNT–SBT–4NN ceramics demonstrate excellent Energy Storage performances with simultaneously ultrahigh Energy Storage Density (W ∼ 3.78 J cm−3), recoverable Energy Storage Density (Wrec ∼ 3.08 J cm−3) and efficiency (81.4%). Furthermore, the ceramics possess excellent discharge Energy Density (Wd = 0.854 J cm−3) and rapid discharge speed (t0.9 ∼ 100 ns) in a wide temperature range, proving their high application potential. Our results break through the bottleneck of BNT-based ferroelectrics with a general recoverable Energy Storage Density of lower than 3 J cm−3, making the BNT–SBT–4NN ceramic a powerful candidate material for use in Energy Storage applications.
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novel batio3 based lead free ceramic capacitors featuring high Energy Storage Density high power Density and excellent stability
Journal of Materials Chemistry C, 2018Co-Authors: Mingxing Zhou, Zhiyong Zhou, Ruihong Liang, Xianlin DongAbstract:The development of Energy Storage devices with a high Energy Storage Density, high power Density, and excellent stability has always been a long-cherished goal for many researchers as they tackle issues concerning Energy conservation and environmental protection. In this work, we report a novel BaTiO3-based lead-free composition (0.85BaTiO3–0.15Bi(Zn1/2Sn1/2)O3) with an ultrahigh Energy Storage Density (2.41 J cm−3) and a high Energy Storage efficiency of 91.6%, which is superior to other lead-free systems reported recently. The Energy Storage properties of 0.85BT–0.15BZS ceramic manifest excellent frequency stability (5–1000 Hz) and fatigue endurance (cycle number: 105). The pulsed charging–discharging process is measured to elucidate the actual operation performance in the 0.85BT–0.15BZS ceramic. Delightfully, the 0.85BT–0.15BZS ceramic also possesses an ultrahigh current Density of 551 A cm−2 and a giant power Density of 30.3 MW cm−3, and the stored Energy is released in sub-microseconds. Moreover, the 0.85BT–0.15BZS ceramic exhibits outstanding temperature stability of its dielectric properties, Energy Storage properties, and charging–discharging performance over a broad temperature range (20–160 °C) due to the weakly-coupled relaxor behavior. These results not only indicate the superior potential of environment-friendly BaTiO3-based relaxor ferroelectric ceramics for the design of ceramic capacitors of both high Energy Storage and power applications, but they also show the merit of the weakly-coupled relaxor behavior to improve the thermal stability of Energy Storage properties.
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large Energy Storage Density low Energy loss and highly stable pb0 97la0 02 zr0 66sn0 23ti0 11 o3 antiferroelectric thin film capacitors
Journal of The European Ceramic Society, 2018Co-Authors: Zhengjie Lin, Ying Chen, Zhen Liu, Genshui Wang, D Remiens, Xianlin DongAbstract:Abstract In this work, high performance (Pb0.97La0.02)(Zr0.66Sn0.23Ti0.11)O3 polycrystalline antiferroelectric thin-film was successfully fabricated on (La0.7Sr0.3)MnO3/Al2O3(0001) substrate via a cost-effectively chemical solution method. A large recoverable Energy Storage Density (Wre) of 46.3 J/cm3 and high efficiency (η) of 84% were realized simultaneously under an electric field of 4 MV/cm by taking full advantage of the linear dielectric response after the electric field induced antiferroelectric-ferroelectric transition. Moreover, the PLZST thin-film displayed high temperature stability. With increasing temperature from 300 K to 380 K, the Wre decreased only 1.3%. The film also exhibited good fatigue endurance up to 1 × 105 cycling under an electric field of 2.2 MV/cm. Our work underlines the importance of the interface quality between the film and the substrate and the important role of linear dielectric answer after saturation in the improvement of the Energy Storage Density and efficiency of antiferroelectric materials.
Bo Shen - One of the best experts on this subject based on the ideXlab platform.
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significantly enhanced Energy Storage Density and efficiency of bnt based perovskite ceramics via a site defect engineering
Energy Storage Materials, 2020Co-Authors: Fei Yan, Bo Shen, Kaiwei Huang, Tao Jiang, Xiaofeng Zhou, Yunjing Shi, Jiwei ZhaiAbstract:Abstract In recent years, sodium bismuth titanate (Bi0.5Na0.5TiO3, BNT) -based relaxor ferroelectrics have attracted more and more attention for Energy Storage applications owing to their high power Density, large saturated polarization (PS)/maximum polarization (Pmax) as well as meeting the needs of environment-friendly society. However, the recoverable Energy Storage Density (Wrec) and Energy Storage efficiency (η) of most BNT-based relaxor ferroelectric ceramics are lower than 3.5 J cm−3 and/or 80%, respectively, in recently. In this work, the relaxor ferroelectric ceramics of 0.75Bi(0.5+x)Na(0.5-x)TiO3-0.25SrTiO3 (BNST-x) were constructed via A-site defect engineering and prepared by tape-casting method. It is worth noting that an ultrahigh Wrec of 5.63 J cm−3 together with outstanding η of 94% can be achieved simultaneously at a relative high electric field of 535 kV cm−1 with the composition of BNST-0.08, Meanwhile, for BNST-0.08 ceramic, the η is higher than 90% and the variation of Wrec is less than ±2% and ±5% within the frequency range of 1–100 Hz and temperature range of 30–130 °C, respectively. The Wrec is always higher than 3 J cm−3 and did not deteriorate significantly after 104 fatigue cycles. In addition, the BNST-0.08 ceramic also possesses ultrafast discharge speed (t0.9, less than 125 ns) and ultrahigh power Density (PD, higher than 147 MW cm−3) within the temperature range of 30–130 °C at 300 kV cm−1. Therefore, the BNST-0.08 ceramic is promising candidate environment-friendly materials for advanced pulsed power capacitor applications and the Energy Storage properties of BNT-based relaxor ferroelectrics can be enhanced significantly via A-site defect engineering.
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multifunctionality of lead free bifeo3 based ergodic relaxor ferroelectric ceramics high Energy Storage performance and electrocaloric effect
Journal of Alloys and Compounds, 2019Co-Authors: Jiwei Zhai, Bo Shen, Huarong Zeng, Xiaodong JianAbstract:Abstract With industrializations speeding up, the need for materials with multiple functions are growing because of ever-increasing complexity of electronic devices. The BiFeO3- based ferroelectric relaxor ceramic as a multifunctional material has been ignored thus far. This work innovatively investigates the multifunctionality in a novel lead-free BiFeO3-BaTiO3-(Sr0.7Bi0.2)TiO3 relaxor ferroelectric ceramics since a high Energy Storage performance and electrocaloric effect are simultaneously obtained. Results show that a large adiabatic temperature change ΔT∼1.44 K is achieved. The total Energy Storage Density (WS) reaches to ∼2.34 J/cm3, recoverable Energy Storage Density (WR) are ∼1.74 J/cm3, accompanied by a high efficiency η∼74%. The charge- discharge characterizations indicate that this ceramic possesses an ultrahigh current Density of 1184.7 A/cm2 and power Density of 59.2 MW/cm3. In particular, the discharging speed is ultra-fast and the discharging period τ is in range of 25–30 ns at room temperature. This work strongly indicates that the studied ceramic is a promising candidate in multifunctional applications such as cooling devices and pulsed power electronics and also enrich the species of the lead-free materials in multifunctionality.
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structure design strategy of 0 3 type bi0 32sr0 42na0 20 tio3 mgo composite to boost Energy Storage Density efficiency and charge discharge performance
Journal of The European Ceramic Society, 2019Co-Authors: Huarong Zeng, Bo Shen, Feng Li, Jie Wang, Jiwei ZhaiAbstract:Abstract A novel 0–3 type (Bi0.32Sr0.42Na0.20)TiO3/MgO composite is investigated in this work, which possesses a high stored Energy Storage Density ws˜2.50 J/cm3, recoverable Energy Storage Density WR˜2.09 J/cm3 with high efficiency η˜84% under low electric field (20 kV/mm). The excellent performance is owning to the increase of breakdown strength (BDS) value and the intrinsic mechanism for enhanced BDS value by MgO incorporation is disclosed by numerical simulations (COMSOL). Moreover, the studied composite exhibits excellent charge-discharge performance, the current Density (CD) and power Density (PD) are 1671 A/cm2 and 150 MW/cm3, respectively, which are much superior to that of other ceramics. Besides, most of the stored Energy is discharged within ˜0.15 μs via charge-discharge tests. This work not only provides a novel technique to designing bismuth-based ceramic capacitors with simultaneously high Wd, η and excellent charge-discharge performance, but also deepens the understandings of the role for the metallic oxide in the composite.
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Achieving high discharge Energy Density and efficiency with NBT-based ceramics for application in capacitors
Journal of Materials Chemistry C, 2019Co-Authors: Di Hu, Bo Shen, Yang Zhang, Jiwei ZhaiAbstract:High-performance capacitors, which have high Energy Storage Density as well as high discharge efficiency, are desired. In this study, we have designed and prepared novel and high quality (1 − x)(0.65Bi0.5Na0.5TiO3–0.35Bi0.1Sr0.85TiO3)–x(K0.5Na0.5NbO3) [(1 − x)(BNT–BST)–xKNN, x = 0, 0.04, 0.06, 0.08, and 0.10] ceramics that demonstrated a remarkable Energy Storage capability, high efficiency, and ultrafast discharge speed. Particularly, the 0.94(BNT–BST)–0.06KNN ceramic possessed an excellent stored Energy Storage Density (Ws = ∼3.13 J cm−3) and recoverable Energy Storage Density (Wr = ∼2.65 J cm−3), and maintained a relatively high efficiency (η = ∼84.6%) at a relatively low electric field of 180 MV m−1, which is superior to those of the lead-free BNT-based Energy-Storage materials. Moreover, excellent temperature (20–120 °C) and frequency (1–100 Hz) stabilities of the 0.94(BNT–BST)–0.06KNN ceramic were also achieved. More importantly, the 0.94(BNT–BST)–0.06KNN ceramic exhibited an ultrafast discharge rate (τ0.9 = ∼1.01 μs), a high level of discharge Energy Density (Wd −1.21 J cm−3), and excellent reliability in Energy Storage performance by consecutive cycling. Moreover, this study also provides an effective approach to attain large Energy-Storage capability along with high efficiency in BNT-based ceramics for application in pulsed power capacitors.
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simultaneously high Energy Storage Density and responsivity in quasi hysteresis free mn doped bi0 5na0 5tio3 batio3 sr0 7bi0 2 0 1 tio3 ergodic relaxor ceramics
Materials research letters, 2018Co-Authors: Jiwei Zhai, Bo Shen, Xing Liu, Huarong ZengAbstract:ABSTRACTHigh-Energy Storage Density, responsivity and efficiency, i.e. WR = 1.07 J/cm3, ξ = 119 J/(kV m2) and η = 92%, were simultaneously obtained in Mn-doped 0.62Bi0.5Na0.5TiO3-0.06BaTiO3-0.32(Sr0.7Bi0.2□0.1)TiO3 ergodic relaxor ceramics. Appropriate Mn doping was beneficial to enhance breakdown field strength. Moreover, temperature and different atmosphere-dependent impedance spectroscopy results indicated that oxygen vacancies were the conductivity mechanism for all samples. The valence state of Mn together with the conjugation between Mn ion and oxygen vacancies was confirmed by X-ray photoelectron spectra and electric paramagnetic resonance. The above results indicate that quasi-hysteresis-free loops with high-Energy Storage performances can be obtained by the induced defect complex.IMPACT STATEMENTHigh-Energy Storage Density WR = 1.07 J/cm3, responsivity ξ = 119 J/(kV m2) and efficiency η = 92% were simultaneously obtained in quasi-hysteresis-free ceramics by introducing defect complex.
Xihong Hao - One of the best experts on this subject based on the ideXlab platform.
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antiferroelectric thick film grown on metal foils with fast discharge speed and excellent Energy Storage properties
Journal of Materials Science: Materials in Electronics, 2019Co-Authors: Ying Zhang, Xihong Hao, Ningning Sun, Haitao Jiang, Jiwei ZhaiAbstract:Antiferroelectric (AFE) Pb0.94La0.04Zr0.97Ti0.03O3 (PLZT) thick film was successfully fabricated on nickel foils by using sol–gel method. The film exhibits dense microstructure with low surface roughness and pure perovskite phase. It displays high dielectric constant of 433 at 100 kHz and room temperature, which is 28% larger than that on traditional silicon substrate. Calculated by polarization-field (P–E) hysteresis loop, the recoverable Energy-Storage Density (Wrec) of 18.4 J/cm3 and the efficiency (Ƞ) value of 54% at 1400 kV/cm are obtained in the thick film. Measured by resistance–inductance–capacitance (RLC) circuit, the maximum pulsed discharge Energy-Storage Density (Wdis) of 12.4 J/cm3 is found at the same electric field of 1400 kV/cm. Moreover, 90% of the Energy is released in a short time of about 84 ns, displaying super-fast discharging characteristic. The AFE film with high discharge Energy-Storage Density and fast discharge time provides strong potential for the application in modern electronics and electrical power systems.
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ultra high Energy Storage Density and fast discharge speed of pb ₓla srₓ zr sn o antiferroelectric ceramics prepared via the tape casting method
Journal of Materials Chemistry, 2019Co-Authors: Xiaohui Liu, Xihong HaoAbstract:Inspired by the increasing demand for high Energy-Storage capacitors in electronic and electrical systems, the development of dielectrics with high Energy-Storage performance has attracted much attention recently. Here, a record-high recoverable Energy-Storage Density of 11.18 J cm⁻³ and a high Energy efficiency of 82.2% are realized in (Pb₀.₉₈–ₓLa₀.₀₂Srₓ)(Zr₀.₉Sn₀.₁)₀.₉₉₅O₃ (PLSZS) antiferroelectric ceramics prepared using the tape-casting method. Sr²⁺-doping and the tape-casting method give rise to a colossal increase in breakdown strength and switching of the electric field between the antiferroelectric and ferroelectric phase, which are responsible for the excellent Energy-Storage properties. Furthermore, with respect to the discharge performance, the antiferroelectric PLSZS ceramics exhibit a high discharge Energy Density of 8.6 J cm⁻³, and fast discharge speed where 90% of the stored Energy could be released in 185 ns. This study opens up a promising and feasible route for designing high Energy-Storage materials via an appropriate element doping and fabricating method, and more importantly, gives PLSZS antiferroelectric ceramics an unexpected role with potential for application in high-power pulsed capacitors.
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giant Energy Storage Density and high efficiency achieved in bi0 5na0 5 tio3 bi ni0 5zr0 5 o3 thick films with polar nanoregions
Journal of Materials Chemistry C, 2018Co-Authors: Ningning Sun, Qiwei Zhang, Xihong HaoAbstract:The development of electronic devices towards integration, miniaturization and environmental friendliness has propelled much recent research on lead-free dielectric capacitors for Energy Storage, however, high Energy-Storage Density is still an extremely challenging objective for lead-free dielectric materials. Here, a novel lead-free relaxor ferroelectric (1 − x)(Bi0.5 Na0.5)TiO3–xBi(Ni0.5Zr0.5)O3 (BNT–xBNZ, x = 0–0.5) thick film (1 μm) was fabricated by a water-based sol–gel method. Doping of BNZ into the BNT host promoted the formation of polar nanoregions (PNRs), whose domain switching became easier, leading to an improved Energy-Storage performance. Surprisingly, an ultrahigh recoverable Energy Density of 50.1 J cm−3 and a high Energy-Storage efficiency of 63.9% under 2200 kV cm−1 were achieved simultaneously with x = 0.4, which are both more than 100% higher than those of the pure BNT sample. This excellent Energy-Storage performance can be perfectly comparable with that of lead-based films. Furthermore, the BNT–0.4BNZ thick film showed strong fatigue endurance after 6 × 107 cycles, and it possessed good thermal and frequency stability. The pulsed discharge current waveform demonstrated that the BNT–0.4BNZ thick film showed a very fast discharge speed (210 ns). This study shows that BNT-based materials have an unexpected role as a lead-free family in the field of Energy Storage and could stimulate the design and fabrication of BNT-based dielectrics with ultrahigh Energy-Storage performance.
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Energy Storage properties and electrocaloric effect of pb 1 3x 2 laxzr0 85ti0 15o3 antiferroelectric thick films
ACS Applied Materials & Interfaces, 2014Co-Authors: Ye Zhao, Xihong Hao, Qi ZhangAbstract:Antiferroelectric (AFE) thick (1 μm) films of Pb(1–3x/2)LaxZr0.85Ti0.15O3 (PLZT) with x = 0.08, 0.10, 0.12, and 0.14 were deposited on LaNiO3/Si (100) substrates by a sol–gel method. The dielectric properties, Energy-Storage performance, electrocaloric effect, and leakage current behavior were investigated in detail. With increasing La content, dielectric constant and saturated polarizations of the thick films were gradually decreased. A maximum recoverable Energy-Storage Density of 38 J/cm3 and efficiency of 71% were achieved in the thick films with x = 0.12 at room temperature. A large reversible adiabatic temperature change of ΔT = 25.0 °C was presented in the thick films with x = 0.08 at 127 °C at 990 kV/cm. Moreover, all the samples had a lower leakage current Density below 10–6 A/cm2 at room temperature. These results indicated that the PLZT AFE thick films could be a potential candidate for applications in high Energy-Storage Density capacitors and cooling devices.
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composition dependent dielectric and Energy Storage properties of pb la zr sn ti o3 antiferroelectric thick films
Applied Physics Letters, 2013Co-Authors: Xihong Hao, Ying Wang, Le Zhang, Liwen ZhangAbstract:1.8 -μm-(Pb0.97La0.02)(Zr0.95−xSnxTi0.05)O3 antiferroelectric thick films with orthorhombic (x = 0.05 and 0.25) and tetragonal (x = 0.40) structure were deposited on platinum-buffered silicon substrates by using a chemical solution way. All the films had a uniform microstructure with pure perovskite phase. With increasing x value, dielectric constant and critical electric breakdown field of the thick films were gradually increased, while their saturated polarizations were decreased. As a result, their maximum recoverable Energy-Storage Density was increased for the thick films with larger x values. A huge recoverable Energy-Storage Density of 56 J/cm3 was obtained in antiferroelectric thick films with x = 0.40. Moreover, a good temperature-dependent stability of the Energy Storage was obtained in the all films from 20 to 120 °C.
Genshui Wang - One of the best experts on this subject based on the ideXlab platform.
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enhanced Energy Storage properties in sodium bismuth titanate based ceramics for dielectric capacitor applications
Journal of Materials Chemistry C, 2019Co-Authors: Yuzhu Fan, Xianlin Dong, Mingxing Zhou, Fei Cao, Ningtao Liu, Ping Peng, Shiguang Yan, Genshui WangAbstract:There are imperious demands for developing eco-benign Energy Storage materials with high-performance in a sustainable society. In this paper, we introduce Sr0.85Bi0.1□0.05TiO3 (SBT) and NaNbO3 (NN) into Bi0.5Na0.5TiO3 (BNT) ceramics through compositional design. The introduction of Sr2+ ions and vacancies at the A-sites constructs relaxor ferroelectrics according to order–disorder theory. The introduction of Nb5+ ions at the B-sites is confirmed to have two major implications. In one way, it boosts a higher induced polarization due to its intrinsic larger polarizability and overall stronger degree of diffuseness. In another, it contributes to forming a core–shell microstructure, as proven using transmission electron microscopy, promoting the breakdown strength (BDS) to a higher level. With the above strategies, our BNT–SBT–4NN ceramics demonstrate excellent Energy Storage performances with simultaneously ultrahigh Energy Storage Density (W ∼ 3.78 J cm−3), recoverable Energy Storage Density (Wrec ∼ 3.08 J cm−3) and efficiency (81.4%). Furthermore, the ceramics possess excellent discharge Energy Density (Wd = 0.854 J cm−3) and rapid discharge speed (t0.9 ∼ 100 ns) in a wide temperature range, proving their high application potential. Our results break through the bottleneck of BNT-based ferroelectrics with a general recoverable Energy Storage Density of lower than 3 J cm−3, making the BNT–SBT–4NN ceramic a powerful candidate material for use in Energy Storage applications.
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large Energy Storage Density low Energy loss and highly stable pb0 97la0 02 zr0 66sn0 23ti0 11 o3 antiferroelectric thin film capacitors
Journal of The European Ceramic Society, 2018Co-Authors: Zhengjie Lin, Ying Chen, Zhen Liu, Genshui Wang, D Remiens, Xianlin DongAbstract:Abstract In this work, high performance (Pb0.97La0.02)(Zr0.66Sn0.23Ti0.11)O3 polycrystalline antiferroelectric thin-film was successfully fabricated on (La0.7Sr0.3)MnO3/Al2O3(0001) substrate via a cost-effectively chemical solution method. A large recoverable Energy Storage Density (Wre) of 46.3 J/cm3 and high efficiency (η) of 84% were realized simultaneously under an electric field of 4 MV/cm by taking full advantage of the linear dielectric response after the electric field induced antiferroelectric-ferroelectric transition. Moreover, the PLZST thin-film displayed high temperature stability. With increasing temperature from 300 K to 380 K, the Wre decreased only 1.3%. The film also exhibited good fatigue endurance up to 1 × 105 cycling under an electric field of 2.2 MV/cm. Our work underlines the importance of the interface quality between the film and the substrate and the important role of linear dielectric answer after saturation in the improvement of the Energy Storage Density and efficiency of antiferroelectric materials.
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c a ratio dependent Energy Storage Density in 0 9 x bi0 5na0 5tio3 xbatio3 0 1k0 5na0 5nbo3 ceramics
Journal of the American Ceramic Society, 2011Co-Authors: Feng Gao, Xianlin Dong, Chaoliang Mao, Fei Cao, Genshui WangAbstract:The (0.9−x)Bi0.5Na0.5TiO3–xBaTiO3–0.1K0.5Na0.5NbO3 [BNBKN(x), x = 0.060, 0.063, 0.066, and 0.069] ceramics were fabricated by the conventional sintering technique. The P–E hysteresis loops measured under 5 kV/mm at room temperature show that the BNBKN(0.063) ceramics obtain the maximum (Ps−Pr) value of 20.6 μC/cm2 and the largest Energy-Storage Density W of 0.424 J/cm3. In addition, calculation from the X-ray diffraction results shows that the BNBKN(0.063) ceramics are featured with the largest c/a ratio of 0.70887. The W is observed to increase with the increase of the c/a ratio in the BNBKN(x) ceramics. The c/a ratio can be regarded as a significant factor for W in the BNBKN(x) ceramics.