MATERIALS & DESIGN
·
2017
·
IF 4.364
Fangwei Qi,Ning Chen,Qi Wang
The polyamide11 (PA11)/BaTiO 3 nanocomposite powders for use in selective laser sintering (SLS) were successfully prepared through a novel method combining the techniques of solid state shear milling, melt blending and cryogenic grinding . This provided a method for the large scale and non-solvent production of functional nanocomposite powders. The related mechanism, structure and properties of the obtained composites were investigated. The results indicated that the solid state shear milling technique could efficiently realize better dispersion of BaTiO 3 nanoparticles in the PA11 matrix and improve their interfacial compatibilities, endowing the composites with better processability and electrical performance. The sintering windows (between the initial temperature of melting and crystallization) of the PA11/BaTiO 3 nanocomposites were greatly enhanced by the solid state shear milling technique, especially for the composites containing 40 wt% BaTiO 3 particles, for which the sintering window increased from 10.1 °C to 14.6 °C, providing a wide sintering window for SLS. Meanwhile, the dielectric constant (ε r ), piezoelectric strain coefficient (d 33 ) and piezoelectric voltage coefficient (g 33 ) of the SLS printed PA11/BaTiO 3 nanocomposite parts increased after the milling treatment. Finally, the complex PA11/BaTiO 3 nanocomposite parts with high dimensional accuracy and good mechanical properties were fabricated by the SLS machine.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Song Liu,Faqiang Zhang,Yan Gu,Jin Luo,Zhifu Liu
Core-shell structured fine grain dielectrics, featured with high dielectric constant and wide temperature stability, are essential for the production of high-end MLCCs. In this work, the core-shell structured 100BaTiO 3 - x BaO-2.4MgO-1.0ZrO 2 -0.03MoO 3 -2.25Y 2 O 3 -0.3MnO 2 -2.0SiO 2 ( x = 0.5, 1.0, 1.5, 2.0, 3.0, 4.0) ceramics were prepared and the effects of BaO additions on the microstructure and dielectric properties were studied. The resulting ceramics exhibited fine grains (average size 280–300 nm) and demonstrated a high dielectric constant (>1780). Notably, the core-shell structure of the ceramics was affected by the BaO content, with the core volume gradually increasing as the BaO addition grew. This adjustment in composition was found to enhance the temperature stability and reliability of the materials. When the BaO addition reaches 4.0 mol%, the values of Δ C 150 / C 25 °C were effectively suppressed from −22 % to −10.3 % to meet the X8R specification, and the insulation resistivity increased by more than an order of magnitude, reaching a maximum of 11.6 × 10 12 Ω m. Our findings highlight the potential of BaO as an effective additive for enhancing the dielectric properties of core-shell structured fine grain dielectrics for high-end MLCCs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-12
·
IF 2.8
Tang Lanxin,Li Shuangchi,Wang Fang,Chen Yu
The binary perovskite-type compound (1 − x )BiFeO 3 – x BaTiO 3 (BF-BT) is considered as a promising high-temperature lead-free piezoelectric material due to its high Curie temperature ( T C > 400 °C) and better electromechanical properties. In this work, ternary lead-free piezoelectric ceramics with a chemical formula of (0.67 − x )BiFeO3–0.33BaTiO3– x Bi(Zn0.5Ti0.5)O 3 + 1 mol% MnO 2 (where x = 0–0.05) were prepared by the conventional solid-state reaction route. The effects of Bi(Zn 0.5 Ti 0.5 )O 3 introduction on the phase structures and microstructures, piezoelectric and dielectric properties, as well as impedance characteristics of BF-BT ceramics were investigated in detail. Firstly, all the samples synthesized exhibit a pure perovskite structure with the coexistence of rhombohedral ( R ) and tetragonal ( T ) phases, and the T phase content increases with increase in x . A small amount of Bi(Zn 0.5 Ti 0.5 )O 3 ( x ≤ 0.03) that were incorporated into the perovskite lattice of BF-BT can promote the grain growth of ceramics. Secondly, all samples were found with a notable relaxed phase transition behavior, T C of the system decreases with increase in x . The AC impedance spectra of the samples were fitted and analyzed according to the R-CPE equivalent circuit model, the electric impedance of the ceramics at high temperatures was mainly contributed by grain boundaries. Moreover, the dielectric relaxation activation energy of the samples firstly decreases and then increases with increase in x . Finally, the composition with x = 0.02 shows the optimized electrical properties among these samples, including T C = 454 °C, d 33 = 117 pC/N, k p = 23%, tan δ = 0.11, which are mainly benefited from the bismuth content compensation and the substitution of (Zn 0.5 Ti 0.5 ) 3+ for Fe 3+ at B-site reducing the valence change of Fe 3+ in BF-BT.
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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 %).
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 8
·569
·
IF 4.3
Jin Hu,Fangfang Liu
The low energy density (Ud) of polymeric dielectrics is unfavorable for the integration and miniaturization of electronics, thus limiting their application prospects. Introducing high-εr(dielectric constant) ceramic nanofillers to polymer matrices is the most common strategy to enhance theirεr,and hence theirUd. By comparison, enhancing breakdown strength (Eb) is a more effective strategy to enhanceUd. Herein, 0.6BaTiO3-0.4Bi(Mg0.5Ti0.5)O3and 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3nanofibers coated with SiO2were utilized as fillers in PVDF-based nanocomposites. The combination of experimental and simulation results suggests that the intrinsic properties of nanofillers are the determining factor of theEbof polymer-based nanocomposites, and SiO2coating and film structure design are effective strategies to enhance theirEb, and consequently theirUd. As a result, the sandwich-structured PVDF/6 wt% 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3@SiO2nanofiber within PVDF/PVDF nanocomposite films achieved a maximumUdof 11.1 J/cm3at anEbof 458 MV/m, which are 2.15 and 1.40 times those of pristine PVDF, respectively.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 28
·56185-56193
·
IF 5.6
Jinxin Fu,Changrong Zhou,Jun Chen,Huihui Liu,Hao Yang,Qingning Li,Changlai Yuan,Jiwen Xu,Guanghui Rao
The incomplete preferred orientation polarization and partially back-switching reoriented domains during/after poling with electrical loading and unloading were ubiquitous and suppressed both piezoelectric constant ( d 33 ) and depolarization temperature ( T d ) of piezoelectric ceramics. In this work, a simple poling strategy with multi-cycles of AC electric field is proposed to realize polarization wake-up in unmodified 0.92Bi 0.5 Na 0.5 TiO 3 -0.08BaTiO 3 (BNT-8BT) with significantly enhanced d 33 from 65 pC/N to 161 pC/N and high T d of 200 °C simultaneously. Through comprehensive analysis on the polarization wake-up and polarization switching process, it is demonstrated that remarkably improved d 33 originates from AC cycles poling induced coexistence of P 4 bm and P 4 mm phases, depinned domains and defect dipoles orientation polarization. The internal bias field (E i ) resulted from defect dipoles orientation aids the d 33 and its high temperature stability. Our work provides a convenient and inexpensive method that there need not commonly delicate compositions control in lead-free piezoceramics on advancing to alleviate the trade-off between d 33 and T d .
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 6
·6382-6388
·
IF 1.798
Wang Yuxuan,Liang Weizheng,Huang Wen,Gao Min,Zhang Yin,Lin Yuan
Fe-doped BaTiO 3 thin films were grown on (001) oriented LaAlO 3 substrates using a polymer-assisted deposition technique. The microstructural and chemical state characters of the films with the Fe doping range from 1 to 10 at% were systematically investigated by X-ray diffraction and X-ray photoelectron spectroscopy. Evolution of the preferred orientation and strain status of BaTiO 3 films could be observed with increasing doping amount of Fe. Meanwhile, UV–Vis spectra of doped BaTiO 3 thin films showed that the band gap could be strongly affected by the doping amount of Fe with the smallest value at the Fe doping rate of 3 at%, which is proposed to be associated with the inevitable oxygen vacancies and the substitution of Ti ions by the Fe dopants.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xinyu Wang,Rui Yang,Peng Lu,Jiabao Wang,Chunhua Lu,Kai Guo,Ning Zhu,Xin Hu
To meet the growing requirement for highly integrated electronic systems, nanocomposites comprised high dielectric constant ( ε ) ceramic nanofillers and large dielectric breakdown strength ( E b ) polymer has been widely investigated for high energy density capacitor. However, the poor interfacial compatibility arising from the great difference of surface energies and ε values usually resulted to the sacrifice of the dielectric properties and thus the capacitive performance. In this work, a series of core-shell structured barium titanate (BaTiO 3 ) nanofillers were designed and prepared to address this challenge via surface-initiated atom transfer radical polymerization (SI-ATRP) of methyl methacrylate (MMA), ethyl methacrylate (EMA) and glycidyl methacrylate (GMA). BaTiO 3 @PMMA (BT@M), BaTiO 3 @PEMA (BT@E), BaTiO 3 @PGMA (BT@G) were fabricated and incorporated into poly (vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP), PVH), respectively. Enhanced dielectric properties, E b , and energy storage density were observed in these nanocomposites comparing with nanocomposites of BT/PVH. It should be ascribed to the polymer shell layer alleviated the great surface energy and ε value disparity between BT filler and PVH matrix, which was responsible for the enhancement of the interfacial compatibility and homogenous distribution of electric fields. Among these three types of nanocomposites, PVH/BT@G exhibited superior dielectric properties and capacitive performance. Extraordinary advances in charge carrier suppression at elevating temperature and electric field were also witnessed in PVH/BT@G. It should be attributed to the polar PGMA layer served as the deep traps, which block the charge motion in the filler-matrix interfaces. At optimal conditions, energy density of 10.61 J cm −3 and efficiency of 65.7 % at 360 MV m −1 was achieved. This work may provide insight into the rational design of the shell layer of the fillers for polymer nanocomposites dielectrics.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Pengwei Jia,Yuanliang Li,Zhanshen Zheng,Yun Liu,Yan Wang,Tong Liu
The improved separation efficiency of photogenerated electrons and holes is an effective way to improve photocatalytic performance. Herein, the high efficiency sheet/fiber g-C 3 N 4 /BaTiO 3 photocatalysts with built-in electric field are successfully synthesized by electrospinning and simple calcination method. Compared with pure g-C 3 N 4 and BaTiO 3 , g-C 3 N 4 /BaTiO 3 heterojunction possesses higher photogenerated electron-hole pairs separation efficiency and larger specific surface area, thus improving the photocatalytic activity of g-C 3 N 4 /BaTiO 3 catalysts. Besides, the ferroelectric polarization produced by external electric field significantly promotes the CO 2 reduction performance of CNBT20 [the component with mass fractions BT / (CN/BT) = 20 %], whose reduction rates of CH 3 OH and CH 3 CH 2 OH are 1.44 and 1.50 times that of unpolarized CNBT20, accompanied with remarkable cyclic stability. The coupling effect of heterojunction and ferroelectric polarization improves the separation efficiency of photoexcited carriers in g-C 3 N 4 /BaTiO 3 significantly, hence providing broad prospects for the combination of traditional semiconductors and ferroelectric materials to improve photocatalytic performance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Pu Mao,Qinzhao Sun,Lixue Zhang,Zepeng Wang,Liqiang He,Ruirui Kang,Gang Lu,Bing Xie,Zhiyong Liu,Jiping Wang
The development of excellent performances polymer-based nanocomposite films with high discharge energy density and high discharge efficiency are eagerly desirable for promoting their electric energy storage applications. However, the high discharge energy density and efficiency of polymer-based nanocomposite films are usually not compatible above intermediate electric fields. To address this issue, here we propose a newly designed multilayer-structured nanocomposite film with a combination of introducing the BaTiO 3 /CaCu 3 Ti 4 O 12 @SiO 2 (BT/CCTO@SO) hybrid nanoparticles with core–shell structure in middle layer and the poly(methyl methacrylate) (PMMA) linear polymer with low loss in outer layers. These motivations of introducing the core–shell structured hybrid nanoparticles with high dielectric constant and designing the multilayered structure give rise to an enhancement of maximum electric displacement while maintaining a relatively high breakdown strength. Also importantly, bring the PMMA polymer into top and bottom layers results in the low energy loss of whole nanocomposite film. Benefiting from these merits, a larger maximum electric displacement of 11.7 μC/cm 2 and a higher discharge energy density of 18.84 J/cm 3 accompanied with an ultrahigh discharge efficiency of 79.81% under an intermediate electric field of 418.13 MV/m are achieved in multilayer-structured nanocomposite film even at a very low filler loading of 2 wt% BT/CCTO@SO hybrid nanoparticles in middle layer, and these enhanced values are far higher than that of the monolayer nanocomposite films. This work validates the advantages of multilayered structure to integrate multiple components and presents outstanding overall performances of nanocomposite films in further applications of the dielectric capacitors with miniaturization and integration.
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高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2020
·Vol. 22
·期 4
·044003
·
IF 1.358
Chenyuan TENG,Wenjun ZHOU,Yuanxiang ZHOU,Ling ZHANG,Yunxiao ZHANG,Zhongliu ZHOU,Wenpeng LI
The DC electrical resistivity-temperature characteristic is an important property for insulating materials to operate at a high stress level. In order to improve the DC electrical resistivity at elevated temperature in a targeted way, a positive temperature coefficient (PTC) material (BaTiO3-based compound (BT60)) was selected as the filler in this paper, whose electrical resistivity has a PTC effect when the temperature exceeds its Curie temperature. The BT60 was treated with hydrogen peroxide and (3-Aminopropyl) triethoxysilane. Epoxy composites with different loadings of BT60 fillers (0 wt%, 0.5 wt%, and 2 wt% of epoxy) were prepared, denoted as EP-0, EP-0.5, and EP-2. It was shown that BT60 was able to maintain the DC breakdown strength when its loading was less than 2 wt% of epoxy. As the temperature exceeds 60 °C, BT60 will compensate for the negative temperature coefficient effect of epoxy resin to some extent. The electrical resistivity of EP-2 was improved by 55% compared with that of neat epoxy at 90 °C. It was found that the potential barrier at the grain boundary of BT60 and the deep traps in the interface between BT60 and the epoxy resin hinder the migration of carriers and thus increase the electrical resistivity of epoxy composite.
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高影响因子
Nano Energy
·
2019
·
IF 15.548
Xianwen Liang,Xuecheng Yu,Lulu Lv,Tao Zhao,Suibin Luo,Shuhui Yu,Rong Sun,Ching-Ping Wong,Pengli Zhu
Polymer-based materials with superb dielectric properties and energy storage performance are of essential significance in today's numerous electronic and electrical power systems. Herein, BaTiO 3 internally decorated hollow porous carbon (BT@HPC) hybrids are prepared via a unique combination of surfactant-free method and sol-gel, which are utilized as the fillers in the two outer layers of a sandwich-structured polymer composite with neat polyvinylidene fluoride (PVDF) as the central layer. Significantly improved permittivity approaches 39 (1 kHz) for the sandwich-structured composite with a low filler content of 7 wt% (~6.02 vol%) attributing to plentiful interfacial space charge polarizations (SCPs) and sophisticated microcapacitor networks constructed by BT@HPCs, while the dielectric loss still retains a low value of 0.03 owing to suppressed carrier transportation by the interfacial obstruction between adjacent layers in this hierarchical architecture. Also, enhanced energy storage density of 10.2 J/cm 3 with a high charge-discharge efficiency of 77% is achieved in the sandwich-structured composite with 1 wt% (~0.85 vol%) BT@HPC under a relative low applied electric field of 360 MV/m, to which interfacial barrier effect and redistribution of local electric field in the multilayer configuration make vital contributions. This work broadens the avenue to reinforce performance of polymer dielectrics for capacitive energy storage applications by designing specific structured particles as fillers in hierarchical architecture composite.
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高影响因子
危险品化学品经营许可证（带存储）