PHYSICA B-CONDENSED MATTER
·
2019
·
IF 1.874
Lei Zhang,Jiaxin Wen,Zixi Zhang,Jun Yang,Hao Huang,Qiaoyu Hu,Hourong Zhuang,Hongyu Yu
As high-performance dielectric material , small sizes of barium titanate (BaTiO 3 ) are desirable for the application of multilayer ceramic capacitors . Herein, we synthesized ultrafine BaTiO 3 powders with mean particle size of ( d av. ) 156 nm, tetragonality ( c/a ) of 1.0092 and specific surface area ( S BET ) of 6.09 m 2 /g by two-step sintering process. Kinetic analysis of solid-state reaction reveals that the phase-boundary-controlled mechanism dominated the reaction process in two-step sintering process compared with one-step sintering process dominated by the first-order mechanism. It is also shown that enhanced nucleation in two-step calcination is beneficial for improving the tetragonality. In particular, the dielectric constant and dielectric loss of BaTiO 3 ceramics at the Curie temperature are found to be about 12800 and 0.003. This work demonstrates a strategy to trigger a method which can effectively improve the dielectric properties of BaTiO 3 ceramic.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
Barium zirconate titanate (Ba(Zr x Ti 1-x )O 3 ) thick film ceramics were prepared using a tape-casting method. Their structures, morphologies, and electric properties were characterized using XRD , SEM and impedance analysis approaches, respectively. The electrocaloric effects (ECE), i.e., isothermal entropy changes and adiabatic temperature changes, were calculated using a Maxwell relation. It was confirmed by XRD and SEM that the obtained thick film ceramics are pure and dense perovskite structures. The dielectric analyses indicate that the Ba(Zr x Ti 1-x )O 3 thick film ceramics show characteristics of transition from normal to relaxor ferroelectrics with the increasing Zr 4+ ionic content. The polarization – electric field (P-E) hysteresis loops reveal larger polarizations and the ceramics can withstand an electric field as high as 12 MV/m. The adiabatic temperature changes ΔT calculated via the Maxwell relation and the polarization as a function of temperature, which is extracted from the P-E hysteresis loops measured at 12 MV m −1 are from 3.7 to 0.28 K with the increasing Zr 4+ ionic content.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Wang Peng,Zhou Xiaosong,Lv Caili,Wang Yu,Wang Zongliang,Wang Liqiang,Zhu Yongzhan,Guo Min,Zhang Peibiao
The endogenous electrical potential generated by native bone and periosteum plays a key role in maintaining bone mass and quality. Inspired by the electrical properties of bone, different negative surface potentials are built on microspheres to restore electric microenvironment for powerful bone regeneration, which was prepared by the combination of strontium-doped barium titanate (Sr-BTO) nanoparticles and poly (lactic-co-glycolic acid) (PLGA) with high electrostatic voltage field (HEV). The surface potential was modulated through regulating the phase composition of nanoparticles in microspheres by the doping amount of strontium ion (Sr2+). As a result, the 0.1Sr-BTO/PLGA group shows the lowest surface potential and its relative permittivity is closer to natural bone. As expected, the 0.1Sr-BTO/PLGA microspheres performed cytocompatibility, osteogenic activity in vitro and enhance bone regeneration in vivo. Furthermore, the potential mechanism of Sr-BTO/PLGA microspheres to promote osteogenic differentiation was further explored. The lower surface potential generated on Sr-BTO/PLGA microspheres regulates cell membrane potential and leads to an increase in the intracellular calcium ion (Ca2+) concentration, which could activate the Calcineurin (CaN)/Nuclear factor of activated T-cells (NFAT) signaling pathway to promote osteogenic differentiation. This study established an effective method to modulate the surface potential, which provides a prospective exploration for electrical stimulation therapy. The 0.1Sr-BTO/PLGA microsphere with lower surface potential and bone-matched dielectric constant is expected to have great potential in the field of bone regeneration.
研究领域:
生物材料学
·
骨组织工程
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Pei Xu,Zhaopei Cui,Hanyang Chen,Yunsheng Ding
To investigate the synergies of graphene and BaTiO 3 on the morphology and dielectric behavior of poly(vinylidene fluoride) (PVDF), γ-oxo-pyrenebutyric acid-modified graphene (GPA) and BaTiO 3 were incorporated into PVDF matrix by using solution-cast and hot-pressing method. π-π interaction between graphene (Gra) and γ-oxo-pyrenebutyric acid (PA), and the hydrogen bonding effect between hydroxy groups on BaTiO 3 and PVDF can improve the dispersity of Gra and BaTiO 3 in PVDF matrix. The addition of BaTiO 3 improved further the dielectric permittivity that originates from high dielectric BaTiO 3 , and remarkable interfacial polarization effect between PVDF and fillers, and the non-conducting organic groups of PA can support the low loss and conductivity in PVDF/GPA/BT composites that shows potential application as high dielectric material over a broad temperature range.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Jin-Hong Guo,Yi-Jiang Zeng,Jia-Le Chen,Sheng-Guo Lu
Barium zirconate titanate (BZT) (Ba(ZrxTi1–x)O3) ceramics with Zr4+ contents of x = 5, 10, 15, 20, 25, and 30 mol % were prepared using a solid-state reaction approach. The microstructures, morphologies, and electric properties were characterized using X-ray diffraction, scanning electron microscopy, and impedance analysis methods, respectively. The dielectric analyses indicate that the BZT bulk ceramics show characteristics of phase transition from a normal ferroelectric to a relaxor ferroelectric with the increasing Zr4+ ionic content. The electrocaloric effect adiabatic temperature change decreases with the increasing Zr4+ content. The highest adiabatic temperature change obtained is 2.4 K for BZT ceramics with a 5 mol % of Zr4+ ionic content.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Kanghou Ma,Caiyue Sun,Yitao He,Xinyue Zhao,Sunfa Wang,Ge Zhang,Chen Wang,Fangshuo Zhou,Zhiguo Liu,Zhe Lü,Xiqiang Huang,Ningning Wu,Yaohui Zhang
This study presents a novel approach to enhance silicon anode performance through barium titanate (BTO) incorporation, with the establishment of a force-electric coupling model. By introducing piezoelectric BTO into silicon matrices, we successfully improved both the mechanical stability and electrochemical kinetics of the anode. The developed force-electric coupling model explains how BTO mitigates stress accumulation during lithiation while optimizing the kinetics of Li + and electron transfer. Experimental verification and multiphysical simulation indicate that Si@BTO effectively eliminates structural degradation during the cycling process and significantly reduces the charge transfer resistance. The force-electric coupling mechanism further facilitates stable solid electrolyte interphase (SEI) formation. When paired with LiFePO 4 cathodes, Si@BTO maintains 76% capacity retention after 500 cycles at a 10 C rate. This work establishes a basic force-electric coupling model framework and offers insights into the development of advanced silicon anode batteries with exceptional performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yanli Deng,Lutong Li,Long Wang,Na Wu,Huihui Jin,Feng Gao,Zhihui Zeng
W-type ferrites possessing low cost and high chemical stability, show high potential in electromagnetic wave (EMW) absorption field. However, due to the low dielectric loss, developing high EMW absorption performance of W-type ferrites remains desired. Here, rare earth (RE) cerium (Ce)-doped W-type barium ferrites (Ba 1-y Ce y Ni 2 Fe 15.4 O 27 , y=0.1, 0.2, 0.3, 0.4, 0.5, 0.6) are prepared by a sol-gel approach. The influences of Ce doping are detailed analyzed. Ce ions with unpaired 4f electrons and strong spin-orbit coupling of angular momentum enhance the dielectric and magnetic properties of ferrites. Ba 0.7 Ce 0.3 Ni 2 Fe 15.4 O 27 achieves the minimum reflection loss (RL min ) value of -52 dB while Ba 0.6 Ce 0.4 Ni 2 Fe 15.4 O 27 showcases the widest effective absorption bandwidth (EAB) of 1.36 GHz associated with the RL min reaching -38 dB, significantly outperforming the undoped ferrites. This work thus demonstrates a high-efficiency utilization of Ce for enhancing the EMW absorption performance of widely employed W-type barium ferrites, efficiently advancing the application field of RE elements.
研究领域:
材料科学
·
电磁学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2025
·Vol. 33
·期 4
·8043-8054
·
IF 3.3
Mengjiao Li,Xiaoshuai Zhang,Xiaoyi Ma,Jia Li,Jie Gong,Panlai Li,Panlai Li,Xiaoyan Yu,Zixuan Wang,Chengrun Liu,Guodong Zhang,Guodong Zhang,Zhijun Wang,Zhijun Wang
To facilitate the development of near-infrared light sources for photovoltaic and night-vision lighting applications, it is crucial to obtain novel near-infrared emitting phosphors. Herein, a novel Eu2+-activated broadband near-infrared emitting phosphor CaScBO4: Eu2+ is reported. Under 558 nm light excitation, CaScBO4: Eu2+ exhibits broadband near-infrared emission centered at 780 nm with a full width at half maxima of 147 nm. The luminescence intensity is significantly enhanced by 7-fold through a cation modulation strategy using Ba2+ for Ca2+ substitution. The mechanism of the increase of the luminescence intensity is explained in detail by the change in the symmetric stretching force of the B-O bond before and after the substitution. Finally, the Ca0.85Ba0.15ScBO4: Eu2+ phosphor was encapsulated in a 558 nm chip to form a phosphor-converted light-emitting diode device, and exploratory experiments were performed to explore the applications in night vision lighting. The results show that the phosphor has great potential for application in the field of night vision lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Manting Zeng,Xingzhong Liu,Hua Hao,Zhonghua Yao,Hanxing Liu
BaTiO 3 -1.6MnO 2 - x Er 2 O 3 ceramics (abbreviated as BMT- x Er) and BaTiO 3 -1.6MnO 2 -3Er 2 O 3 - x MgO ceramics (abbreviated as BEMT- x Mg) were prepared under a reducing atmosphere by solid-state synthesis method in this work. The effects of Er/Mg co-doping on phase transformation, microstructure, dielectric properties, and defect were systematically investigated. Research shows that Er-doping reduces the Curie temperature and increases the dielectric constant of BaTiO 3 ceramics at low temperatures. Mg-doping refines the grain size and makes the grain size distribution more uniform, which is an important reason for the enhanced bias stability. The substitution of Mg at the B-site generates additional oxygen vacancies which capture free electrons and simultaneously forms defect dipoles. The anti-reducing properties are improved by reducing the carrier concentration. The synergistic effect of co-doping forms defect dipoles such as [ Mg Ti ″ ‐ 2 Er Ba ∙ ] , [ Mg Ti ″ ‐ V O ∙ ∙ ] and [ 2 Er Ti ′ ‐ V O ∙ ∙ ] to enhance dielectric relaxation behavior which is considered to be the reason for the improved dielectric temperature stability. When x = 0.4, optimized dielectric ceramics are obtained with ε 25°C = 1820, tanδ = 0.009, resistivity of 1.0 × 10 11 Ω·cm, which meets the EIA X7R standard (−55 °C - 125 °C, TCC ≤ ± 15 %).
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2012
·Vol. 95
·期 11
·3525-3531
·
IF 2.272
Guofeng Yao,Xiaohui Wang,Yichi Zhang,Zhengbo Shen,Longtu Li
0.9BaTiO 3 –0.1Bi 0.5 Na 0.5 TiO 3 -based (0.9BT–0.1BNT) ceramics with T c = 180°C were prepared using a novel chemical coating method. The relationships among compositions, microstructures, and properties were investigated. TEM morphologies displayed the Nb-coated powders, which were confirmed by energy dispersive spectroscopy (EDS). Temperature-dependence of permittivity for Nb-modified 0.9BT–0.1BNT ceramics measured at different frequencies showed no relaxor characteristic at high temperature, but frequency dispersion at low temperature. The microstructures were characterized by two types of grains: Nb-rich grains and Nb-free grains, which were responsible for temperature-stable dielectric properties. The sample with 5 mol% Nb addition satisfied the X9R specification. The permittivity was 1934 and the dissipation factor was 1.53% at room temperature.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junyu Wang,Jiangnan Guo,Qinggang Zhou,Yuejin Zhu,Qizhi Liu,Shuozhen Hu,Xinsheng Zhang
Formic acid is a desirable liquid hydrogen storage compound for solving transport and storage problems of hydrogen for onboard fuel cells. Optimizing adsorption/desorption energy of intermediates can directly modulate the performance of Pd catalysts in formic acid dehydrogenation (FAD). Herein, we introduce internal electric field with controllable strength to regulate the adsorption/desorption of intermediates on Pd. Non-ferroelectric cubic-phase barium titanate (CBT) is heat-treated at high temperature to obtain ferroelectric tetragonal-phase barium titanate (TBT(C)), which exhibits internal electric field. The strength of the internal electric field is successfully adjusted by heat treatment at different temperatures. The size of Pd nanoparticles is restricted between 2.2 and 2.7 nm, and the electronic effect of Pd is effectively eliminated by coating TBT(C) with mesoporous carbon shell (TBT(C)@SC). Experimental results prove that the internal electric field promotes the desorption of hydrogen on Pd. Pd/TBT(C)@SC-800 obtained by heat treatment at 800 °C, with the optimal internal electric field strength, exhibits high activity and hydrogen selectivity for FAD. This work provides a new strategy for designing FAD catalysts.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Kangkang Yuan,Chen Shu,Kexin Meng,Wenjun Zhao,Guosheng Sun,Jien Zhu,Jin Chen,Yunlong Huang,Chengshun Li,Xiaotong Jin
Calcium zirconate (CaZrO 3 )-based fibrous membrane is a promising candidate in high-temperature areas for its high melting point, good phase stability up to 1900°C, low thermal conductivity, and low cost. To further enhance the high temperature flexibility of CaZrO 3 -based fibrous membrane without sacrificing stability, modification methods should be conducted. In the present work, a CaZrO 3 -BaZrO 3 dual-phasic structure was proposed to modify the high-temperature properties from the standpoint of phase competition. CaZrO 3 -BaZrO 3 fibrous membranes were prepared with the combination of the electrospinning method and pyrolysis process. The decomposition process, phase transformation, crystallize size, and microstructure evolution of CaZrO 3 -BaZrO 3 precursor fibrous membrane were characterized. The grain size, particle size, NIR reflectivity, high-temperature stability, fire retardancy, and high-temperature flexibility were also characterized and compared with other CaZrO 3 -based fibrous membranes. The higher thermal stability and flexibility of the CaZrO 3 -BaZrO 3 fibrous membrane at 1200°C would make it a good candidate for high-temperature insulating, high-temperature supporting, and high-temperature filtration.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）