JOURNAL OF APPLIED PHYSICS
·
2021
·Vol. 130
·期 14
·
IF 2.546
Peng Xiao-Yan,Tang Yu-Cheng,Zhang Bo-Ping,Zhu Li-Feng,Xun Bo-Wei,Yu Jing-Ru
BiFeO 3 -BaTiO 3 is a promising high-temperature lead-free piezo-ceramics due to its high Curie temperature ( T C > 500 °C) and excellent piezoelectric properties. However, a high leakage current was often detected in this system, which severely affects its applications. In this work, the 0.7BiFe (1− x ) Ga x O 3 -0.3BaTiO 3 (BFGa x -BT, 0.00 ≤ x ≤ 0.10) system was designed to reveal the reason of leakage-current density decreased by their leakage mechanism. Because of the suppression of generation of Fe 2+ and oxygen vacancy ( V O ∙ ∙ ), the leakage mechanism from space charge limited conduction mechanism found in Ga-free BF-BT ceramics turns into Ohmic conduction and Schottky emission mechanism as Fe 3+ was replaced with Ga 3+ . A good combination of piezoelectric properties ( d 33 = 174 pC N −1 and k p = 29%) and high Curie temperature ( T C = 497 °C) was achieved in the BFGa0.06-BT ceramic owning the lowest leakage-current density. This work will provide the clues for preparing the high insulation and high piezoelectric performance BF-BT-based ceramics by suppressing the valence change of Fe 3+ and V O ∙ ∙ appearance.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 58
·36473-36481
·
IF 3.108
Lujun Yu,Yaofeng Zhu,Yaqin Fu
A rational structure design is always an attractive approach for high-performance microwave absorbers. Accordingly, flexible BaTiO3@Ni–P/polyvinylidene fluoride/polyaniline (BaTiO3@Ni–P/PVDF/PANI) composite films were fabricated by growing aligned PANI on the surface of a BaTiO3@Ni–P/PVDF composite film. Morphology and structure characterization showed that uniform core–shell BaTiO3@Ni–P microspheres and the unique conelike shapes of aligned PANI were innovatively fabricated. The effect of the special structure on microwave absorption properties was investigated within the 2–18 GHz frequency range. The prepared absorbents displayed exceptional microwave absorption performances. The minimum reflection of BaTiO3@Ni–P/PVDF/PANI reached −22.56 dB at 12.72 GHz with a thickness of 2 mm, and the bandwidth that corresponded to reflection loss below −10 dB reached 4.33 GHz (11.12–15.45 GHz). The possible absorption mechanism of BaTiO3@Ni–P/PVDF/PANI was also studied in detail. Results offer an effective means to develop microwave absorbers via rational microstructure design.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 4
·1302-1312
·
IF 8.067
Hui Tang,Xiang Niu,Peng-Fei Zhao,Xin-Gui Tang,Xiao-Dong Jian,Xian-Yi Chen,Xiao-Cao Peng,Zhi-Peng Yang,Sheng-Guo Lu
xBiFeO3–(1 − x)BaTiO3 relaxor ferroelectric ceramics were synthesized via the high-temperature solid-state reaction process. The X-ray diffraction patterns of xBiFeO3–(1 − x)BaTiO3 showed that the structure of samples was transformed from the tetragonal phase to the pseudo-cubic phase when x ≥ 0.025. The calculated universal Curie–Weiss constants and slim shape of the polarization-electric field hysteresis loops indicated that xBiFeO3–(1 − x)BaTiO3 ceramic was converted from a normal ferroelectric to a relaxor ferroelectric. The energy-storage properties of 0.1BiFeO3–0.9BaTiO3 were also measured at room temperature. The maximum discharged energy density and efficiency procured were 1.22 J cm−3 and 85.98%, respectively. The electric field-dependent energy-storage density was fitted using an exponential function of En, and it was found that n < 2. It was worth noting that the positive electrocaloric effect (ECE) was observed in xBiFeO3–(1 − x)BaTiO3 bulk ceramics, no matter when directly measured using a thermocouple or indirectly calculated using the Maxwell relation. Also, a ΔTmax of 1.55 K was indirectly calculated from the temperature-dependent P–E hysteresis loops for 0.05BiFeO3–0.95BaTiO3; while a ΔTmax of 2.20 K was directly obtained using the thermocouple. The positive ECE means that the xBiFeO3–(1 − x)BaTiO3 is a conventional ferroelectric or relaxor ferroelectric. Finally, the electrocaloric strengths measured were considered with the equation dT/dE obtained by Lu et al.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Hongcheng Gao,Shunlian Ning,Jiasui Zou,Shuang Men,Yuan Zhou,Xiujun Wang,Xiongwu Kang
The slow redox dynamics and dissolution of polysulfides in lithium–sulfur (Li–S) batteries result in poor rate performance and rapid decay of battery capacity, thus limiting their practical application. Ferroelectric barium titanate (BT) nanoparticles have been reported to effectively improve the electrochemical performance of Li–S batteries due to the inherent self-polarization and high adsorption capacity of the BT nanoparticles towards polysulfides. Here in this paper, BT nanoparticles, behave as highly efficient electrocatalyst and demonstrate much higher redox dynamics towards the conversion reaction of polysulfides and Li 2 S than TiO 2 , as shown by both electrochemical measurements and density functional theory calculation. The coupling of the sulfur host of the hollow and graphitic carbon flakes (HGCF) and the BT nanoparticles (HGCF/S-BT) enable excellent electrochemical performance of Li–S batteries, delivering a 0.047% capacity decay per cycle in 1000 cycles at 1 C, 788 mAh g –1 at 2 C and a reversible capacity of 613 mAh g −1 after 300 cycles at a current density of 0.5 C at a S loading of 3.4 mg cm –2 . HGCF/S-BT also shows great promise for practical application in flexible devices as demonstrated on the soft-packaged Li–S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2014
·
IF 0.687
Jijiao Li,Bo Li,Hongya Wu,Ji Zhou
Barium titanate ( BaTiO 3 ) woodpile structures with designed, three-dimensional (3D) geometry have been fabricated by direct-writing assembly techniques. Concentrated BaTiO 3 inks with suitable rheological properties were prepared to enable the fabrication of the complex 3D structures. It was demonstrated that BaTiO 3 inks with a total solids volume fraction of 0.41 are shear thinning and have a high storage modulus 1 × 10 5 Pa with a yield stress of 300 Pa. Additionally, the woodpile lattice structures exhibited an excellent self-supporting feature.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 23
·20017-20032
·
IF 2.324
Chen Gang,Peng Xiaodong,Fu Chunlin,Cai Wei,Gao Rongli,Fan Peigeng,Zhang Xiaoya,Yi Xin,Ji Cong,Yang Hongqi,Yong Hualei
(1− x ) BaTiO 3 – x BiYbO 3 (abbreviated as (1− x ) BT− x BY, x = 0, 0.03, 0.06 and 0.09) ferroelectric ceramics have been fabricated by conventional sintering (CS) and microwave sintering (MWS) methods. The microstructure, dielectric and ferroelectric properties of (1− x ) BT– x BY ceramics have been investigated systematically. X-ray diffraction patterns indicate all samples possess single perovskite phase and the crystal structure transforms from tetragonal to pseudo-cubic phase with increasing x . It can be also found that denser microstructure and finer grains can be obtained by MWS compared to CS as indicated by scanning electron microscopy. Dielectric measurements reveal that the addition of BY can lead to an obvious relaxation behavior in all samples, and the relaxation characteristics of MWS samples are stronger than those of CS samples. Moreover, the dielectric constant decreases with increasing BY content and the temperature stability and frequency stability of dielectric properties can be enhanced by using MWS method and addition of BY. P – E hysteresis loops become slimmer with the increase of BY content, and the ferroelectric properties of MWS samples are similar to those of CS samples. The leakage current of MWS sample is smaller than that of CS sample from J – E curve. The energy storage efficiency ( η ) increases with increasing BY content, while the energy storage density ( U ) increases and then decreases, U max is obtained at x = 0.06. These results demonstrate that MWS technique and moderate BY content are effective methods to prepare materials for energy storage application.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Gao Yuan,Yu Pi-Hang,Zhang Jun,Zhang Guo-Dong,Guo Chuan-Hui,Zhou Yi-Qian,Long Yun-Ze,Wu Hui
Lead-free barium titanate (BaTiO 3 ) nanofiber material is an attractive functional material. However, as a ceramic material, its inherent brittleness significantly limits its widespread application. Herein, we optimized the solution blow spinning process using aerodynamic simulations, enabling the efficient fabrication of layered barium titanate/aluminum oxide (BaTiO 3 /Al 2 O 3 ) ceramic nanofiber aerogels. The incorporation of amorphous Al 2 O 3 repaired the defects in the nanofibers, providing aerogels with outstanding mechanical properties. For example, these aerogels can support nearly 1000 times their own weight, exhibit a tensile strain of 11%, and demonstrate exceptional compressive resilience and fatigue resistance. Additionally, the aerogels demonstrated superior performance in flexible electronics, thermal protection, sound absorption, and high-temperature filtration. This research paves the way for the large-scale production and extensive application of flexible piezoelectric ceramic aerogels. Graphical abstract
研究领域:
材料科学
·
纳米技术
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Tingyu Zhao,Ruirui Cui,Kaixin Guo,Min Zhang,Xu Wang,Jun Zhang,Chaoyong Deng
In this work, by doping the B-site of BaTiO 3 with Mg elements, we have prepared BaMg x Ti 1- x O 3- x (BM x T) films with superparaelectric behaviors. The microstructures, polarization behaviors, breakdown strength, leakage current density, and energy storage performance are investigated systematically of the BM x T films. The breakdown strength of the film reaches 7.5 MV/cm when x = 0.18, at the same time, excellent energy storage density (67.7 J/cm 3 ) and energy storage efficiency (94.9 %) are obtained, which is attributed to the doping of the acceptor element Mg. By doping Mg with a lower chemical valence state to form defect dipoles in the lattice, the breakdown strength and polarization properties of the film are improved while reducing the crystallinity of the film, forming a hysteresis loop with superparaelectric properties. This work provides a feasible route to design superparaelectric materials with simple compositions for high-performance capacitive energy-storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Junchuan Wang,Yunchen Long,Ying Sun,Xueqin Zhang,Hong Yang,Baoping Lin
High energy density polymer nanocomposites with high-temperature resistance are quite desirable for film capacitors and many other power electronics. In this study, polyimide-based (PI) nanocomposite films containing the core-shell structured barium titanate@silicon dioxide (BT@SiO 2 ) nanofibers have been successfully synthesized by the solution casting method. In the BT@SiO 2 /PI nanocomposite films, the dielectric permittivity as well as the breakdown strength increase significantly. The SiO 2 shell layers with moderate dielectric permittivity could effectively mitigate the local field concentration induced by the large mismatch between the dielectric permittivity of BT and PI, which contributes to the enhancement of the breakdown strength of the PI nanocomposite films. As a result, the PI nanocomposite film filled with 3 vol% BT@SiO 2 nanofibers exhibits a maximal energy density of 2.31 J cm −3 under the field of 346 kV/mm, which is 62% over the pristine PI (1.42 J cm −3 at 308 kV/mm) and about 200% greater than the best commercial polymer, i.e. biaxially oriented polypropylenes (BOPP) (≈1.2 J cm −3 ). The thermogravimetric analysis results indicate that the BT@SiO 2 /PI nanocomposite films have good thermal stability below 500 °C.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiaoteng Chen,Jinxing Sun,Binbin Guo,Yue Wang,Shixiang Yu,Wei Wang,Jiaming Bai
The fabrication of barium titanate (BaTiO 3 ) lead-free piezoelectric ceramics using additive manufacturing technology, especially digital light processing (DLP), has been gaining a growing interest for electrical applications. The particle size of the ceramic powders plays a key factor on the performance of sintered ceramic components. In this paper, BaTiO 3 ceramic components were fabricated by adopting different suspensions filled with the submicron powder particle size of 200 nm, 500 nm and 600 nm, respectively. Subsequently, the effects of particle size on the rheological properties and photopolymerization behaviors of the suspensions, as well as the density, grain size, piezoelectric and dielectric properties of the ceramic components, were investigated. The result indicated that the suspensions with the coarsest powder showed the lowest viscosity and the highest cure depth; when the grain size distributed in submicron range, the piezoelectric constant ( d 33 ) and relative permittivity ( ε r ) of sintered BaTiO 3 ceramic are direct positively correlated to the grain size. The value of ε r and d 33 were related with domain structure affected by grain size. This work can provide a potential valuable guidance for researchers in selecting suitable BaTiO 3 powders to obtain high-performance piezoelectric ceramic components when using the DLP process.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Li Jin,Renjie Huo,Runping Guo,Fei Li,Dawei Wang,Ye Tian,Qingyuan Hu,Xiaoyong Wei,Zhanbing He,Yan Yan,Gang Liu
The electrostrictive effect has some advantages over the piezoelectric effect, including temperature stability and hysteresis-free character. In the present work, we report the diffuse phase transitions and electrostrictive properties in lead-free Fe3+-doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BZT-0.5BCT) ferroelectric ceramics. The doping concentration was set from 0.25 to 2 mol %. It is found that by introducing Fe3+ ion into BZT-0.5BCT, the temperature corresponding to permittivity maximum Tm was shifted toward lower temperature monotonically by 37 °C per mol % Fe3+ ion. Simultaneously, the phase transitions gradually changed from classical ferroelectric-to-paraelectric phase transitions into diffuse phase transitions with a weak relaxor characteristic. Purely electrostrictive responses with giant electrostrictive coefficient Q33 between 0.04 and 0.05 m4/C2 are observed from 25 to 100 °C for the compositions doped with 1–2 mol % Fe3+ ion. The Q33 of Fe3+-doped BZT-0.5BCT ceramics is almost twice the Q33 of other ferroelectric ceramics. These observations suggest that the present system can be considered as a potential lead-free material for the applications in electrostrictive area and that BT-based ferroelectric ceramics would have giant electrostrictive coefficient over other ferroelectric systems.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yixing Cai,Yangyang Zhang,Shuaibing Gao,Jian Chen,Meilin Wan,Yongming Hu,Yunbin He,Qingfeng Zhang
Currently semiconductor-based near ultraviolet and ultraviolet self-powered photodetectors usually display low detectivity and responsivity due to weak photogenerated electron and hole separation ability and not suitable electrode. BaTiO 3 possesses a high depolarization electric field throughout the bulk and wide band gap (> 3 eV), and hence is a good candidate for fabricating near-ultraviolet and ultraviolet self-powered photodetectors. Cu nanowires (NWs) have been regarded as promising transparent electrode for photodetectors because they have not only equivalent optical transparency and electrical conductivity relative to Ag NWs currently in use, but also far lower cost. But, weak resistance to oxidation in the environment of light and electricity prevents large-scale use of Cu NWs in photodetectors. Herein, an organic corrosion inhibitor , benzotriazole (BTA), is used to passivate Cu NWs, and interestingly, the passivated NW networks exhibit significantly increased resistance to oxidation. At zero field, the BaTiO 3 photodetector coated with Cu@BTA NWs exhibits stable photocurrent, high responsibility of 6.45 × 10 −7 A/W, large detectivity of 1.97 × 10 8 Jones, and fast response rate (rise and decay time being 28.8 ms and 37.2 ms, respectively) at the wavelength of 405 nm, which is far better than indium-tin-oxide electrode-coated BaTiO 3 photodetector. This work provides a strong guideline for large-scale fabrication of low-cost and high-stability transparent electrodes applicable in near-ultraviolet and ultraviolet photoelectric devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）