CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Mengna Feng,Chunting Li,Meng He,Yumin Huang,Juhua Luo
Flexible, high- k and thermostability polymer-based dielectric composites are the core components in electrostatic capacitors and embedded devices. Herein, the dielectric polymer matrix composites are developed by embedding polydopamine (PDA)-encapsulated hydroxylated barium titanate (BTH) and molybdenum disulfide (MoS 2 ) into poly(arylene ether nitrile) (PEN) matrix. The MoS 2 /PDA@BTH-1 particles served as fillers are prepared by polydopamine deposition technology assisted with hydrogen bonding interactions. The introduction of PDA intermediate layer contributes to the construction of multiple interfaces and nanocapacitor networks, enhancing interfacial polarization. Based on this, the resulted dielectric composite with 15 wt% MoS 2 /PDA@BTH-1 loading exhibits the dielectric constant of 17.3 at 1 kHz, higher than that of 4.2 of PEN, while can maintain relatively low dielectric loss simultaneously. The possible mechanisms and synergistic enhancement effect of MoS 2 /PDA@BTH-1 particles on the dielectric properties of composites are also proposed. The results of permittivity-temperature stability show that the dielectric constant of PEN-based dielectric composites is stable when reaches 158 °C, indicating that the film can be used in capacitor at temperatures up to 150 °C, higher than that of most polymer capacitors. All in all, a feasible pathway is provided to design PEN-based dielectric composites with high- k to adopt the high-temperature environment in electrostatic capacitors and embedded devices.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Wangchuan Zhu,Chuantao Wang,Wenhao Hui,Xin Huang,Chunming Yang,Yucang Liang
Developing a convenient, efficient and eco-friendly approach for the recovery of U(VI) ion is a key measure to solve the environmental problems arising from the utilization of nuclear energy. Herein, the high efficiency of uranium extraction is realized by the piezo property of perovskite BaTiO 3 , revealing the intrinsically morphological engineering effect on the piezocatalytic performance. Especially, BaTiO 3 nanowires (BTO NWs) exhibit not only an excellent piezocatalytic activity with U(VI) extraction rate of 96.8% in a UO 2 (NO 3 ) 2 aqueous solution compared to 71.3% of BaTiO 3 nanoparticles (BTO NPs), but also a promising piezocatalyst for U extraction in a real U-mining wastewater with various pH ranges. Piezo response force microscopy and finite elemental simulation show that the piezo response of BTO NWs is much higher than BTO NPs. Additionally, some factors (pH, various ions, different powers) are explored on piezocatalytic efficiency for U(VI) extraction. The results from electron spin resonance and the charge/radical capture experiments confirm that the active species (e - , •O 2- , •OH) stemmed from the piezo induction of BTO NWs and BTO NPs in the piezocatalytic U(VI) reduction process. The present work reveals the structure-performance correlation during piezocatalysis and highlights the crucial role of piezocatalysis in dealing with environmental problems.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 5
·2757-2765
·
IF 5.2
Linyu Pu,Yu Li,Jingyuan Tang,Yiting Long,Wei Wang,Yatang Dai,Xu Huang
Firstly, the BaTiO 3 nanoparticles were coated with a layer of paraffin, forming a core shell structure. Then, as-prepared paraffin@BaTiO 3 nanofillers were directly blended with polyimide (PI) prepolymer to fabricate paraffin@BaTiO 3 /PI composite films. The microstructure, thermal, and dielectric properties were investigated in detail. The surface-modified paraffin@BaTiO 3 nanoparticles exhibited a typical core shell structure with uniform and complete coverage. The char yield of the composite film with 10 wt% paraffin@BaTiO 3 increased from 56.40% to 70.73%. It is obvious that the paraffin@BaTiO 3 nanofillers have a positive effect on ablative performance of the composite film. Compared with pure PI, the ε r of paraffin@BaTiO 3 /PI composites with 40% mass fraction increased from 3.41 to 9.35 (1 kHz). The tanδ of paraffin@BaTiO 3 /PI composites was just 0.0065 (1 kHz) when the filler loading was 40 wt%. Temperature dependency of the permittivity of the composites reveals a zero-temperature-coefficient from 80°C to 180°C.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Gang Chen,Chun Wei Gong,Chun Lin Fu,Xiao Dong Peng,Wei Cai,Rong Li Gao,Xiao Ling Deng
(Sr1-xBax) 2(Nb0.9Ta0.1) 2O7 (SBNT) ceramics were prepared by solid state reaction. The crystal structure of SBNT ceramics, surface morphology and dielectric properties were studied using XRD, SEM and LCR instrument analyzer, respectively. The results show that the grain size decreases with increasing Ba concentration, and all samples show single phase, no second phase can been observed. Addition of Ba ion can improve the dielectric properties of SBN ceramics. The dielectric constant increases first, then decreases; the maximum value (εr=97) can be obtained at x=0.1, the dielectric constant changes slightly with increasing wide frequency.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Yifan Wang,Xinyu Zhang,Luyao Wang,Yu Chen,Yi Yu,Enrico Traversa,Nan Yang
Yttrium-doped barium zirconate (BZY) thin films are widely used in the field of hydrogen energy because of their excellent proton conductivity and chemical stability. However, the existence of barium defects in BZY thin films fabricated by pulsed laser deposition (PLD) significantly hinders their intrinsic conductivity. In this regard, regulating the A-site nonstoichiometry for Ba-containing proton conductor oxides could control the proton transport properties. Herein, we used a target compensation strategy to compensate for the Ba loss in BZY thin films. We synthesized a series of nonstoichiometry graded Ba1+xZr0.8Y0.2O3-δ (Ba1+xZrY, 0.0 ≤ x ≤ 0.3) targets for growing Ba1+xZrY (0.0 ≤ x ≤ 0.3) thin films on MgO (100) substrates by PLD. The results show that the conductivity of the Ba1.3ZrY thin films is 1 order of magnitude larger than that of the Ba1·0ZrY thin films, exhibiting also lower activation energy. The structural characterization shows that the target compensation strategy can effectively fill the Ba vacancy and promote the proton transport of the Ba1+xZrY films, mainly attributed to the prolonged Zr–O bond length and increased Y dopant effective concentration.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ping Gong,Yan Li,Chenxing Xin,Qiaoyu Chen,Liang Hao,Qinglei Sun,Zheng Li
An effective method to fabricate barium titanate (BTO)/carbonyl iron powder (CIP) composites with enhanced microwave absorption (MA) performance was prepared via multimaterial digital optical processing (DLP) 3D printing technique. The bilayer-gradient honeycomb structural absorber (BGHSA) with adjustable broadband can be obtained by leveraging of varying compositional and structural design (layered thickness ratios , and gradient structures). The optimal reflection loss ( R L ) value and effective bandwidth of BGHSA can reach −51 dB and 15.4 GHz, respectively, exhibiting a distinct improvement ( R L increased by 32.4% and effective bandwidth by 42.9%) compared with the reference. The highly improved performances especially in the broadband absorption (15.4 GHz) were mainly attributed to the better impedance matching and waves multi-reflections. This work provides a promising strategy to fabricate functionally graded materials for potential application in the absorption of electromagnetic waves .
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·221-229
·
IF 2.324
Hu Linqing,Zhong Jiachun,Tian Yuhan,Zheng Xiaoyi,Cheng Jie,Pu Zejun
Composite materials applied to capacitors with high dielectric constant, low dielectric loss and outstanding thermal stability are concerned widely in the field of dielectrics. So committed to the development of dielectric materials with excellent performance is the key factor. In this work, the barium titanate/polyether sulfone (BaTiO 3 /PES) composite films were prepared by a physical dispersion technology, which utilized a ball milling machine by high-speed circulation, scattered the PES solution contained BaTiO 3 in deionized water with the aid of a surfactant. Then, the BaTiO 3 /PES composite films were obtained through a series of operations, containing reclaimed organic solvent, washed with deionized water, filtered, dried and hot pressed. The morphology of the BaTiO 3 /PES emulsion was investigated by TEM and SEM. The results showed that the BaTiO 3 particles were covered in the PES resin matrix homogeneously. For 50 wt% BaTiO 3 reinforced PES composite film. The dielectric constant increased by ~ 227% compared with pure PES resin (4.1 at 1 kHz) and the dielectric loss maintained around 10 −2 magnitude, which performed better dielectric properties. The tensile strength of 10 wt% BaTiO 3 /PES composite films (72 MPa) reached the highest value in comparison with those of pure PES (58 MPa) due to the strengthened interaction between particles and matrix. Further increase of BaTiO 3 content, the tensile strength and elongation at break decreased slightly but remained an excellent flexibility from the PES matrix. The temperature at weight loss 5% ( T 5% ) of composite film with 40 wt% of BaTiO 3 content reached up to 503 °C in N 2 atmosphere. All the BaTiO 3 /PES composite films performed the concentrated glass transition temperature ( T g ) around 229 °C. In sum, excellent thermal stability and dielectric properties would make the BaTiO 3 /PES composite films become the fine potential candidates for dielectric composites in the capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Dan Chen,Yanling Jin,Wenxuan Zhu,Qingqing Huang,Yaping Li,Minfeng Lü
Three new fluoride phosphates and fluorophosphates, Ba 3 Fe(PO 4 )F 6 , Ba 3 Ga(PO 3.5 F 0.5 )O 0.5 F 5.5 and Ba 3 Fe(PO 3 F)F 7 , have been synthesized through fluoride-rich hydrothermal reactions . Isostructural Ba 3 Fe(PO 4 )F 6 and Ba 3 Ga(PO 3.5 F 0.5 )O 0.5 F 5.5 revealed a three-dimensional structure comprised of [M(PO 4-x )F 4 ] 4−x chains and two-dimensional [Ba 3 F 2-x O x ] 4+x layers [M = Fe,Ga; x = 0,0.5], while Ba 3 Fe(PO 3 F)F 7 contained distorted two-dimensional [Ba 3 F 2 ] 4+ layers and [Fe(PO 3 F)F 5 ] 4- dimers. Two-dimensional [Ba 3 F 2 ] 4+ layers are formed by fluorine-centred tetrahedra. Close examinations of bond length and bond strength in fluorine-centred tetrahedron complexes suggested that fluorine-centred tetrahedra are indeed reasonable structural subunits.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·
IF 2.8
Jun Chen,Xue Li,Xiaohong Yang,Yutong Wang,Zongsheng Zhan,Dawei Teng,Mingxia Du,Dong Lv,Kaiqi Yao,Chunnian Da,Mengqiu Xu
BACKGROUND Piezoelectric catalysis using perovskite-type barium titanate (BaTiO 3 ) has been applied to the decomposition of refractory organic pollutants through piezoelectric catalytic persulfate (PS). Nevertheless, challenges such as a limited specific surface area, poor electrical conductivity and a tendency towards agglomeration in BaTiO 3 necessitate the exploration of novel methods to enhance its piezoelectric efficiency. RESULTS Sludge carbon (SC) from sewage treatment and BaTiO 3 was utilized to develop a novel piezoelectric catalytic material (BaTiO 3 /SC). The specific surface area of BaTiO 3 /SC reached 67.92 m 2 g −1 , which is nine times larger than that of BaTiO 3 alone. The inclusion of SC in the composite enhanced the number of active sites and contributed to a higher degree of graphitization, improved electrical conductivity, and provided a more stable structure for BaTiO 3 /SC. This material was capable of harvesting mechanical vibration energy from ultrasound, thereby generating piezoelectric catalytic properties and activating PS to achieve a 93% decomposition ratio of enrofloxacin (ENR) in water within 80 min. The activation of PS by BaTiO 3 /SC piezocatalysis led to the production of reactive oxygen species (ROS), such as • OH and SO 4 −• . These ROS attack the quinolone ring of ENR, which is susceptible to cleavage, resulting in the decomposition of ENR into intermediates of lower toxicity. CONCLUSION The incorporation of SC has enhanced the piezoelectric performance of BaTiO 3 , rendering BaTiO 3 /SC a novel perovskite-type piezoelectric catalytic material that improves piezoelectric efficiency. The BaTiO 3 /SC system, through its piezoelectric catalytic activation of PS, demonstrates potential for decomposition of refractory organic pollutants in water treatment. © 2024 Society of Chemical Industry (SCI).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS OF THE SOLID STATE
·
2024
·Vol. 66
·期 9
·318-326
·
IF 0.9
Hui Jizhen,Hushur Anwar,Hasan Amat
Abstract Raman scattering experiments were performed on barium carbonate at ambient temperature and high pressure within a hydrostatic environment, employing liquid nitrogen as the pressure-transmitting medium. This approach allowed for the investigation of hydrostatic pressure effects on the barium carbonate structure. Previous studies suggest that the stability threshold of the orthorhombic barium carbonate structure lies around 8 GPa. At pressures ranging from 8 to 10 GPa, the material exhibited a mixed phase. Upon reaching 10 GPa, the orthorhombic structure of barium carbonate vanished, giving way to a transformation into the trigonal phase. The phase transition significantly impacted the intensity of the Raman spectra, in-dicating an influence on the electronic structure, notably causing the electron cloud to rearrange and the bond character to alter. The re-emergence of the orthorhombic phase at a reduced pressure of 5.3 GPa und-erscored the pronounced hysteresis phenomena associated with the phase transition of barium carbonate. We determined that, while this phase transition is reversible upon pressure release, it is accompanied by persistent characteristic peaks of the trigonal phase, suggesting incomplete transformation back to the orthorhombic phase during decompression, with the residual proportion of the trigonal phase constituting approximately 12%.
研究领域:
材料科学
·
高压物理
·
晶体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mingcheng Ye,Jiaming Ye,Dandan Ma,Zhiyao Zhang,Zuyong Feng,Deping Xiong,Miao He
SnO 2 is considered a promising anode material for lithium-ion batteries (LIBs) due to its significant theoretical capacity derived from alloying and conversion reactions for lithium storage. However, its development is hindered by considerable volume changes, sluggish kinetics, and limited reversibility of the conversion reaction. In this study, carbon-encapsulated graphite nanosheets-hosted SnO 2 -BaTiO 3 composites (C@SnO 2 -BaTiO 3 -G) with heterojunction structure were synthesized by simple ball milling and calcination, and the material as anode for LIBs exhibits a high specific capacity of 1367.7 mAh g −1 after 200 charge-discharge cycles at a current density of 0.1 A g −1 . Even at a high current density of 5 A g −1 , after 2500 long-cycle tests, its specific capacity can still remain at 401.7 mAh g −1 . The addition of BaTiO 3 can effectively enhance the conversion reactions of SnO 2 . The outer carbon layer and graphite nanosheets serve to protect the structure of the composite material during cycling, preventing agglomeration and coarsening. The C@SnO 2 -BaTiO 3 -G composite material effectively addresses the shortcomings of SnO 2 , making it an excellent anode material for high-performance LIBs.
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
MATERIALS CHARACTERIZATION
·
2020
·
IF 3.562
Yuping Wang,Shuying Shi,Qing Dong,Chonghe Xu,Silun Zhu,Xiaoqian Zhang,Yuk Tak Chow,Xinqiang Wang,Guanghui Zhang,Luyi Zhu,Dong Xu
As the pillar material of the electronic ceramic industry, BaTiO 3 (BTO) has superior dielectric and piezoelectric properties . In this present work, pure phase BTO and lanthanum-doped Ba (1–x) La x TiO 3 (BL x T) fibers (x=0.003, 0.006, 0.009 and 0.012) were prepared by electrospinning method with polyacetylacetonatotitanate (PAT). All the fibers after heat-treatment were tetragonal phase with good crystallinity; additionally, the tetragonal phase BTO ceramics have better dielectric properties than the cubic ones. BTO fiber (BTOF) and powder (BTOP) were pressed and sintered into ceramic sheets with BTOF having better formability. Compared with BTOP ceramics, BTOF ceramics had obvious micro-capacitance effect, so they had higher dielectric constants at low frequencies (f < 3000 Hz). Therefore, BTOF ceramics were excellent low frequency capacitor materials which could be applied to low frequency filters. The BTOFs were doped with La 3+ to further improve the dielectric properties. When the doping concentration was 0.9%, the dielectric constant of BL x T fiber ceramics reached the maximum value of 5100 (25 °C, f = 100 Hz). The downward trend of Curie temperature was more uniform with the increase of La 3+ doping amount, pointing to obvious advantages in the manufacturing of temperature-controlled capacitors.
研究领域:
电子陶瓷
·
材料科学
·
介电材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）