Microstructures
·
2026
·Vol. 6
·期 2
·N
·
IF 8.5
Zichen He\u003Csup\u003E1,\u003C\u002Fsup\u003E,Xingyu Chen\u003Csup\u003E1,2,\u003C\u002Fsup\u003E,Faqiang Zhang\u003Csup\u003E1\u003C\u002Fsup\u003E,Zhengqian Fu\u003Csup\u003E1\u003C\u002Fsup\u003E,Xiangyu Meng\u003Csup\u003E3\u003C\u002Fsup\u003E,Dongxiao Fan\u003Csup\u003E4\u003C\u002Fsup\u003E,Jiawei Zhang\u003Csup\u003E1\u003C\u002Fsup\u003E,Mingsheng Ma\u003Csup\u003E1\u003C\u002Fsup\u003E,Yongxiang Li\u003Csup\u003E5\u003C\u002Fsup\u003E,Zhifu Liu\u003Csup\u003E1\u003C\u002Fsup\u003E
With the ongoing miniaturization of multilayer ceramic capacitors (MLCCs), there is an increasing demand for dielectric materials that simultaneously exhibit high dielectric constant, excellent DC-bias stability, and high reliability. To address this challenge, B-site Ca doping was employed to regulate the polar structure of BaTiO3-based ceramics. In this study, we systematically investigated the effects of Ca doping on the crystal structure, defects, and microstructure by varying the dopant concentration and occupancy behavior. The B-site Ca-doped BaTiO3 ceramics exhibit a pseudo-cubic structure, characterized by the coexistence of tetragonal and cubic phases. Ca2+ substitution for Ti4+ disrupts the long-range ferroelectric order, leading to the formation of polar nanoregions (PNRs) interconnected and embedded within a non-polar matrix. Defect analysis and studies on reducing atmosphere sintering reveal that oxygen vacancies are effectively localized by cation defects, thereby suppressing long-range conduction. These structural features synergistically result in a high dielectric constant, superior DC-bias stability, enhanced insulation resistance, and strong non-reducibility. This work provides fundamental insights into the microstructural design of BaTiO3-based ceramics and highlights their potential for high-reliability MLCC applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Shixuan He,Dongdong Li,Guizhao Zhu,Xingqing Duan,Jinting Chen,Bogu Liu,Yawei Li,Haixiang Huang,Haoyuan Zheng,Xinhua Wang,Hong Li,Ying Wu
The practical application of LiBH 4 for solid-state hydrogen storage is hindered by its sluggish kinetics and high thermodynamic stability. To address these challenges, we constructed a multiphase catalytic system within LiBH 4 by incorporating nano-BaTiO 3 and carbon nanotubes (CNTs) through ball milling. The composite of LiBH 4 , 20 wt% BaTiO 3 and 20 wt% CNTs exhibits significantly enhanced dehydrogenation properties, with an initial temperature as low as 223 °C and a peak desorption temperature of 353 °C, releasing 8.2 wt% H 2 at 500 °C. The modified composite demonstrates markedly improved reversibility and kinetics, evidenced by a retained capacity of 4.1 wt% after the 6th cycle and a substantially decreased activation energy of 123 kJ mol −1 . During the first dehydrogenation, LiBH 4 reacts in-situ with BaTiO 3 to form Li 3 BO 3 , BaB 6 , and TiO 2 phases. These products, in conjunction with CNTs, form a multifunctional catalytic framework. Among them, BaB 6 serves as the nucleation site, TiO 2 acts as the active catalyst, and Li 3 BO 3 facilitates ion transport, collectively enhancing the reaction kinetics and cycling stability of LiBH 4 . Meanwhile, the CNTs provides dual functions of confinement and excellent thermal conductivity, which suppressing particle aggregation and enhancing thermal diffusion rate. Consequently, the composite exhibits a lower decomposing temperature, rapider kinetics, and enhances reversibility compared with the as-milled LiBH 4 . This work provides an effective strategy of in-situ engineering a multiphase interface to attain high-performance solid-state hydrogen storage materials.
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高影响因子
Materials Today Physics
·
2026
·
IF 9.3
Yaoning Bai,Zhonghang Xia,Mingwei Li,Yiwen Zhang,Huiming Ji
In this study, Ba 0.997 Gd 0.003 TiO 3 @(Ni,Mn)Nb 2 O 6 + x wt% CaZrO 3 (x=0.2, 0.3, 0.4, 0.5, 0.6) (BGT@(N,M)NO-CZO) dielectric ceramics with excellent performance are synthesized by a simple solid-state reaction method. The lattice distortion formed by the substitution of A site in the perovskite structure by rare earth Gd 3+ ions enhances the dielectric constant of BaTiO 3 (BT) -based ceramics, while a single “core-shell” structure formed by niobate-coated (Shell-1) BGT improves the temperature stability in the low-temperature range. The dielectric constant of BGT@(N,M)NO ceramic reaches about 4500, and the temperature stability meets X7R. More importantly, for further optimize the dielectric properties, an isovalent co-dopant CaZrO 3 is added to the BGT@(N,M)NO ceramic to enhance high temperature stability. In different regions of BT matrix, Zr 4+ replaces Ti 4+ at the B site in the region between the Shell-1 and the core phase to form Shell-2, while Ca 2+ replaces Ba 2+ at the A site mainly in the core phase. Moreover, the double “core-shell” structure BGT@(N,M)NO-CZO ceramics generate internal stress and strong interionic interactions in lattice, leading to a shift in the Curie temperature toward higher temperatures, which enhances the temperature stability of BT-based ceramics between 145 °C to 155 °C range. Therefore, BGT@(N,M)NO-CZO (0.3 wt%) ceramic maintains high dielectric constant (ε r =4852) while extending temperature stability to X8R. Additionally, the dielectric loss of BGT@(N,M)NO-CZO (0.3 wt%) ceramic is reduced to 0.98%, and the room temperature resistivity and breakdown strength are reached 10 10 Ω·m and 89.1 kV/cm, respectively. The DFT calculation results further indicate that high dielectric constant and wide temperature stability correspond Gd 3+ -doped BT and (Zr 4+ , Ca 2+ ) isovalent co-doped BT. Ultimately, the double “core-shell” structure BGT@(N,M)NO-CZO ceramics with excellent dielectric properties are obtained via isovalent co-doping effect, rare earth ion doping effect and “core-shell” effect, which further expands the application of BT-based ceramics in the fields of electronic material and device.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 10
·5279-5287
·
IF 11.9
Yange Yu,Wenzhu Shao,Yue Liu,Yang Li,Jing Zhong,Huijian Ye,Liang Zhen
Superior energy storage performance of PVDF-based nanocomposites such as discharged energy density or efficiency is reported, leading to a lower volume, lightweight system, or high reliability for film capacitors. However, researchers often ignore exploring practical ways to simultaneously enhance the discharged energy density (Ue) and energy storage efficiency (η) as well as the physical mechanism that determines the energy storage performance. Herein, the charge transfer path in the PVDF matrix with core–shell nanoparticles under 150 MV m−1 was first analyzed by finite element simulation. Under the guidance of theoretical simulation, core–shell structured BaTiO3 (BTO)@reduced graphene oxide (rGO) nanoparticles (NPs) were introduced into the PVDF matrix, in which rGO played the trapping role. The introduction of rGO reduces the possibility of local electric field failure of composite materials, optimizing the charge transfer path and improving both Ue and η, which are superior to the data in the literature. An effective strategy for creating high-energy storage polymer nanocomposites is presented in this study.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Cuilian Ding,Shiqi Yu,Xinxuan Tang,Zijin Liu,Hang Luo,Yan Zhang,Dou Zhang,Sheng Chen
In consideration of inherent high hysteretic losses resulting in low energy efficiency for ferroelectric polymer, linear dielectric acrylonitrile butadiene styrene (ABS) with low price and good film property is adopted as optimal polymer matrix. Synchronously, representative ferroelectric barium titanate (BT) nanoparticles with high dielectric constant are selected as the nanofiller. To weaken the surface energy of BT nanoparticles and boost the interfacial interaction, polar polymer (poly[bis(4-cyanophenyl) 2-vinylterephthalate] (PBCN)) is employed as organic coatings to regulate interfacial property. Consequently, core–shell structured PBCN@BT nanoparticles were synthesized by means of reversible addition-fragmentation chain transfer polymerization combined with thiol-ene click reaction and the corresponding ABS-based nanocomposites were prepared. In consequence, discharge energy density increased from 3.2 J/cm 3 for the pure ABS film to 4.5 J/cm 3 for the 0.5 vol%-PBCN@BT/ABS nanocomposites. Meantime, a high energy efficiency of 76% was found. This discovery is of great significance for the development of excellent performance ABS-based dielectric composites.
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 43
·15552-15565
·
IF 7.393
Menghan Xu,Tao Wu,Yiheng Song,Ming Jiang,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
As good alternatives to conventional rigid piezoelectric materials, environment-friendly biomass-based piezoelectric nanocomposites comprising piezoelectric ceramic fillers and a natural polymer matrix are highly desirable for flexible piezoelectric nanogenerators (PENGs) with high output performance. In this work, composite piezoelectric films were successfully prepared through uniform assembly of MoS2 nanosheets and tetragonal BaTiO3 nanoparticles in a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) matrix using a facile, cost-effective and scalable method. The TOCN/MoS2/BaTiO3 ternary composite film demonstrated excellent mechanical properties with the highest tensile strength of 335 MPa and outstanding piezoelectric properties with the maximum longitudinal piezoelectric constant (d33) of 45 pC N−1 much higher than that of other cellulose-based piezoelectric materials. Benefiting from the prominent performance of the flexible cellulose-based nanocomposite, the resulting flexible TOCN/MoS2/BaTiO3 composite film-based PENG exhibited very high and stable output piezoelectric signals: namely, a maximum open-circuit voltage of 8.2 V and a maximum short-circuit current of 0.48 μA. Furthermore, the electricity generated by the PENG illuminated a LED directly or charged a 10 μF capacitor up to 3.1 V at 110 s. With high flexibility and sensitivity, the innovative device can work not only as a self-powered motion sensor to detect tiny forces in the environment and in human motion, but also as an electronic skin with good pyroelectric properties to monitor the temperature. Thus, this research provides new insights into the design and preparation of lightweight and simple-structure PENGs with high flexibility and remarkable piezoelectric performance, presenting great potential in the development of efficient mechanical energy harvesters, active sensor networks and wearable electronics.
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高影响因子
Nano Energy
·
2020
·
IF 16.602
Xiaoyang Guan,Bingang Xu,Jianliang Gong
Flexible piezoelectric nanogenerators (FPENGs) have attracted a great attention owing to their promising applications in harvesting mechanical energy and driving portable devices. To develop high-performance FPENGs, the significant relationship among material, structure and performance inspired us a rational design of FPENGs from Pdop-BaTiO 3 @P(VDF-TrFE) nanocomposite fiber mats with a hierarchically architected microstructure. In contrast with previous approaches, the polydopamine (Pdop) modified barium titanate (BaTiO 3 , BT) nanoparticles have been anchored onto the surface of electrospun poly (vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) fibers to fabricate hierarchical micro-structured membrane in this study, which not only effectively avoids the agglomeration of nanofillers but also enhances the density of interfaces in the nanocomposites. As a result, the as-fabricated FPENGs show a significantly enhanced output of 6 V and 1.5 μA as compared to the PENG with only P(VDF-TrFE) membrane (1.25 V and 0.6 μA). Furthermore, output voltage of the new FPENGs is 40%–68% higher than that of composite membranes with nanoparticles at the interior of nanofibers . The improved output of the PENG is attributed to the high density of interfaces in the hierarchical microstructure and the corresponding enhancement of dielectric response. Then, electric performance of FPENGs was investigated in terms of force, frequency and load resistance. Finally, the FPENG was employed to efficiently detect human body movements as self-powered sensors. The hierarchical nanocomposite membrane designed in this study provides an effective approach for developing mechanical energy harvesters , wearable sensor network and self-powered devices.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoyu Pan,Bin Meng,Qingqing Yang,Xinyu Ping,Congcong Fang,Zhiyuan Ma
In order to further improve their dielectric properties of BaTiO 3 -based high-entropy ceramics, three groups of perovskite-structured high-entropy dielectric ceramics with compositions of (Ca 1/3 Sr 1/3 Ba 1/3 )(Ti 1/3 X 1/3 Y 1/3 )O 3 (X and Y chosen from Zr, Hf, and Sn) were fabricated by solid state reaction method and then fast hot-pressing sintering (FHPS) at 1300 °C and 50 MPa. All three groups of samples possess a single-phase perovskite structure with an average grain size of 160–727 nm and a uniform elemental distribution. Among the three groups of samples, (Ca 1/3 Sr 1/3 Ba 1/3 )(Ti 1/3 Sn 1/3 Hf 1/3 )O 3 exhibits the highest dielectric constant of 11,037 at the Curie temperature of 588 °C, while (Ca 1/3 Sr 1/3 Ba 1/3 )(Ti 1/3 Zr 1/3 Hf 1/3 )O 3 shows the highest discharge energy storage density ( W d = 0.702 J/cm 3 ) and the critical electric field ( CEF = 389 kV/cm) corresponding to the saturation polarization intensity. The CEF and energy storage performance of the three samples are significantly higher than those of BaTiO 3 ( W d = 0.08 J/cm 3 , η = 46.09%, CEF = 30 kV/cm) and other reported BaTiO 3 -based high-entropy ceramics.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 34
·1-10
·
IF 2.8
Huang Chu,Meng Yingzhi,Li Chenlin,Wang Dawei,Chen Xue,Sun Lixian,Peng Biaolin,Lei Xiuyun,Shen Yufang,Liu Laijun
High-performance colossal permittivity ( ε′ > 10 4 ) plays an indispensable role in the development of electronic field. In this work, ultra-high dielectric permittivity ( ε′ > 237, 294 @1 kHz) and low dielectric loss (0.012 @1 kHz) were simultaneously achieved in Ta-doped BaTi 0.995 Ta 0.005 O 3 ceramics. Importantly, the dielectric permittivity changes less than 15% between − 55 and 200 °C, and the dielectric loss is less than 0.04. The excellent giant dielectric performance is related to the defect dipoles of electronic pins associated with electrons/oxygen vacancies/Ti 3+ , which are generated by B-site donor. And the thermal-activated short-range hopping of electrons is conformed to be the origin of low dielectric losses and excellent thermal stability. This work provides a strategy for achieving ultra-high dielectric permittivity, low dielectric loss, and excellent temperature stability of Ta-doped BaTiO 3 simultaneously through B-site defect engineering.
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高影响因子
RSC Advances
·
2023
·Vol. 13
·期 15
·10204-10214
·
IF 3.9
Meilin Li,Bei Jiang,Shuoang Cao,Xinyi Song,Yuanqiao Zhang,Lijun Huang,Quanping Yuan
High-performance flexible barium titanate (BaTiO3)-based piezoelectric devices have gained much attention. However, it is still a challenge to prepare flexible polymer/BaTiO3-based composite materials with uniform distribution and high performance due to the high viscosity of polymers. In this study, novel hybrid BaTiO3 particles were synthesized with assistance of TEMPO-oxidized cellulose nanofibrils (CNFs) via a low-temperature hydrothermal method and explored for their application in piezoelectric composites. Specifically, Ba2+ was adsorbed on uniformly dispersed CNFs with a large amount of negative charge on their surface, which nucleated, resulting in the synthesis of evenly dispersed CNF-BaTiO3. The obtained CNF-BaTiO3 possessed a uniform particle size, few impurities, high crystallinity and dispersity, high compatibility with the polymer substrate and surface activity due to the existence of CNFs. Subsequently, both polyvinylidene fluoride (PVDF) and TEMPO-oxidized CNFs were employed as piezoelectric substrates for the fabrication of a CNF/PVDF/CNF-BaTiO3 composite membrane with a compact structure, displaying the tensile strength of 18.61 ± 3.75 MPa and elongation at break of 3.06 ± 1.33%. Finally, a thin piezoelectric generator (PEG) was assembled, which output a considerable open-circuit voltage (4.4 V) and short-circuit current (200 nA), and could also power a light-emitting diode and charge a 1 μF capacitor to 3.66 V in 500 s. Its longitudinal piezoelectric constant (d33) was 5.25 ± 1.04 pC N−1 even with a small thickness. It also exhibited high sensitivity to human movement, outputting a voltage of about 9 V and current of 739 nA for only a footstep. Thus, it exhibited good sensing property and energy harvesting property, presenting practical application prospects. This work provides a new idea for the preparation of hybrid BaTiO3 and cellulose-based piezoelectric composite materials.
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PubMed
高影响因子
ACS Omega
·
2019
·
IF 2.584
Mingzhou Zhao,Qiong Fu,Yafei Hou,Laihui Luo,Weiping Li
To improve the dielectric performance of polyvinylidene fluoride (PVDF), BaTiO3/MWNTs/PVDF ternary composites were prepared by the solution casting method. The percolation threshold (fraction of MWNTs) has dropped greatly below 0.4 vol %, with the enhancement of dielectric constant and breakdown field. For the BaTiO3/MWNTs/PVDF (11.5/0.35/88.15) composite, the dielectric constant is 59, the loss is below 0.055, and the maximum operating electric field is 324 MV/m, so the discharged energy density can be of up to 10.3 J/cm3 with the efficiency of above 77.2%. The reason of improvement was revealed by the scanning electron microscope images and the X-ray diffraction data. It is found that uniform distribution of filler in the composites and the increase of the β phase of polymers result in the enhancement of polarization and improvement of dielectric constant of PVDF. The third-phase spherical inorganic particles prevent the formation of conductive networks and improve the uniformity of local electric field, so the breakdown strength of composites can be enhanced greatly. Here, this paper provides a method to get the composites with high energy storage density for supercapacitors.
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PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Ze-Hui Dai,Ting Li,Yang Gao,Jun Xu,Jinliang He,Yunxuan Weng,Bao-Hua Guo
Polymer nanocomposite dielectrics have drawn increasing attention recent years. However, dispersion of high- ε nanoparticles causes decreased breakdown strength and increased loss tangent . High dielectric permittivity, high breakdown strength , low dielectric loss and high charging-discharging energy efficiency are hard to achieve at the same time. In this research, in order to achieve all these goals, a combination method consists of cross-linking and dispersion of high- ε nanoparticles was carried out. The cross-linking points limit polymer chain mobility in the amorphous phase, providing lower dielectric loss and lower conductivity. Therefore, breakdown strength increased from 402.8 MV/m of PVDF to 517.2 MV/m of cross-linked PVDF. By dispersing coated BaTiO 3 nanoparticles, followed by cross-linking, cross-linked nanocomposites with higher ε , higher breakdown strength and higher efficiency compared with the polymer matrix were prepared. The maximum discharging energy density reached up to 14.1 J/cm 3 , about 70% higher than 8.02 J/cm 3 for pristine PVDF. This research provides us a novel approach to achieve all these goals by a combination of cross-linking and dispersion of coated BT nanoparticles.
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高影响因子
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