JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 4
·117912
·
IF 6.2
Xingzhong Liu,Manting Zeng,Hua Hao,Zhonghua Yao,Hanxing Liu
This study proposes a novel grain-boundary engineering strategy that synergistically enhances both resistance against reduction and dielectric stability in BaTiO 3 -based ceramics sintered under reducing atmosphere. By constructing uniform 2–3 nm Yb 2 O 3 coatings on 100 nm BaTiO 3 particles via chemical co-precipitation, we achieve in situ formation of Yb 2 Ti 2 O 7 pyrochlore phases at grain boundaries during sintering. Unlike conventional solid-state processed counterparts, the grain-boundary-confined Yb 2 Ti 2 O 7 phases exhibit dual functional mechanisms: Zener pinning-induced ultrafine grain refinement, and lattice mismatch-generated compressive stress that stabilizes the pseudocubic phase. These coupled effects synergistically elevate carrier migration activation energies, enabling ultrahigh resistivity (7.91 ×10 10 Ω·cm) and exceptional resistance against reduction. Simultaneously, the synergy between stress and the grain structure refines ferroelectric domains to the nanoscale, thereby activating strong relaxor behavior that enhances dielectric stability. Consequently, the engineered ceramic simultaneously delivers X7R-compliant thermal stability ( ε 25℃ =1623, tanδ =0.76 %) and minimal DC bias dependence (∆ εᵣ/ε 0 = 4.2 % at 0–2 V/µm).
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Materials Today Physics
·
2023
·
IF 11.5
Zhenfei Yang,Xinnian Xia,Ming Fang,Longlu wang,Shuaijun Pan,Yang guo
Efficient spatial separation of photogenerated carriers is the key to achieving photocatalytic oxidation reduction synergistic reactions, and the built-in electric field generated by piezoelectric effects can provide a strong driving force for charge separation. A novel Pt/ZnIn 2 S 4 /BaTiO 3 (PBZIS) piezo-photocatalyst with spatial charge separation was successfully constructed through two-step hydrothermal and photodeposition methods. Due to the special 1D/2D core/shell structure, the inner BaTiO 3 can served as hole-storage layer, while the outer Pt nanoparticles can acted as electron capture center, thus greatly improving the separation of photo generated charge carriers and achieving spatial separation of redox sites. Under the ultrasound, the polarized electric field induced by the piezoelectric effect can further improve the extraction rate of photo generated holes by BaTiO 3 and accelerate surface catalytic reactions . Therefore, the synergism of electron/hole co-extraction and piezoelectric effect construct a directional transmission channel and target active sites for photogenerated electron-holes over PBZIS heterojunctions , reuslting in the highest performance for photocatalytic cooperative H 2 evolution (1335.3 μmol g −1 h −1 ) and HMF oxidation (1070.8 μmol g −1 h −1 ). This work would inspire the development of high-performance piezo-photocatalysts for the cooperative biomass oxidation coupling with high efficient hydrogen evolution .
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Surfaces and Interfaces
·
2022
·
IF 6.137
Yefeng Feng,Li Liu,Peiyao Chen,Maolin Bo,Jimin Xie,Qihuang Deng
Polymer-based composites with high dielectric constant and low filler load are urgently desired for electrostatic energy storage. To increase dielectric constant of composites with low-content filler, in this work, we have employed a novel strategy of hybridization between BaTiO 3 (BTO) and graphitic carbon nitride (g-C 3 N 4 ) to fabricate ternary composites. First, g-C 3 N 4 @BTO hybrid-filler was synthesized. Then, two series of composite films namely poly(vinylidene fluoride-chlorotrifluoroethylene) (P(VDF-CTFE))/BTO binary composites and P(VDF-CTFE)/hybrid ternary composites were fabricated. Later, dielectric, conductive and breakdown properties of all composites were measured. Finally, density functional theory (DFT) calculations on interface of hybrid-filler were performed to verify high contribution of interface to high dielectric constant of ternary composites. Compared with binary composites, the reduced dielectric loss (@ 100 Hz) and breakdown strength of ternary composites are ascribed to low polymer/BTO interface leakage current and bandgap of hybrid-filler respectively. In ternary composite with 15 wt % hybrid, we detected a high dielectric constant of ∼72 at 100 Hz, low dielectric loss of ∼0.065 at 100 Hz and high breakdown strength of ∼215.8 MV m −1 . For the novelty, an excellent synergy between BTO and g-C 3 N 4 for dielectric applications has been found. This work might pave a road for fabricating promising composites for energy storage.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Liu,Ting Chen,Jian Zheng,Zhijia Zhu,Zhangmi Huang,Chunyan Hu,Baojiang Liu
Using piezoelectric materials for advanced oxidation is a green and viable means of water purification and environmental restoration. However, unmodified piezoelectric catalysts exhibited unsatisfactory catalytic performance, which had become a bottleneck for the practical application of piezoelectric catalysis. In this work, piezoelectric responsiveness and exposed active crystal surface area were rationally coordinated by synthesizing one-dimensional BaTiO 3 nanorods (BTO NRs). Enhanced piezo-responsivity enables faster free charge carriers transfer, while the highly exposed area of the (0 0 1) facets provides more active sites for piezo-catalytic reactions. Consequently, BTO NRs degraded RHB (Rhodamine B) and TC (Tetracycline) with first-order rate constants of 0.018 min −1 and 0.012 min −1 , respectively, 5 times higher than BaTiO 3 nanoparticles. The specific active sites on the (0 0 1) crystal plane were further investigated through a combination of DFT calculations, free radical trapping experiments, and XPS analysis. Ti 4+ adsorbs and activates water molecules to generate Ti 3+ and •OH, in the catalytic reaction. Afterward, Ti 3+ is oxidized to Ti 4+ by piezo-holes (holes driven by piezoelectric potential), while •OH is desorbed and involved in the degradation of pollutants. This research not only provides an approach to modify piezoelectric catalysts with high catalytic activity but also presents new insights into the mechanism of piezoelectric catalysis from the viewpoint of the atom level.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jin-Jian Pan,Jia Huang,Yuan-Hang Qin,Zhen Chen,Li Yang,Cun-Wen Wang,Xingmao Jiang
Ba-based perovskite oxides rich in oxygen vacancies (OVs) are anticipated to possess robust electron-donating capabilities and other favourable properties, rendering them a promising support for Ru catalysts in NH 3 synthesis. Herein, a glucose-urea deep eutectic solvent calcinating method was developed to synthesize an OV-rich BaTiO 3 (BTO-H) support for Ru catalysts. The BTO-H-supported Ru (Ru/BTO-H) catalyst achieves an impressive NH 3 synthesis rate of 5133 μmol g cat –1 h −1 (256.7 mmol g R u –1 h −1 ) at 400 °C and 0.1 MPa, surpassing the performance of Ru catalysts supported on OV-poor BTO supports and other supported Ru catalysts. Physical characterizations and kinetic experiments reveal the multifaceted influence of OVs on enhancing the catalytic performance of Ru/BTO-H in NH 3 synthesis. OVs serve as electron donors to Ru catalyst, facilitating the activation and dissociation of N 2 . Simultaneously, OVs act as hydrogen acceptors from the Ru surface, mitigating hydrogen poisoning effects. Additionally, OVs stimulate the formation of surface hydrides, not only providing active sites for N 2 activation but also bestowing an electron-donating effect on the supported Ru catalyst. The combined positive effects of OVs establish BTO-H as an outstanding support for Ru catalysts in NH 3 synthesis.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Shanshan Guan,Hai Li,Shugao Zhao,Laina Guo
In this work, a novel ternary polydimethylsiloxane (PDMS)-based nanocomposite co-filled by carboxyl-functionalized multi-walled nanotube (cMWCNT) and BaTiO3(BT) nanoparticle were developed. The hybrids cMWCNT-BT was realized via the hydrogen bonding (H-bonding) interaction between –COOH groups of cMWCNT and the -OH groups of BT. Compared with the binary composite of BT/PDMS and cMWCNT/PDMS, the results showed that the kind of three-component nanocomposites had high dielectric permittivity and low dielectric loss. Different from cMWCNT, the hybrids cMWCNT-BT have good dispersion in PDMS matrix, forming many micro-capacitors and interfaces, and thus leading to remarkably high dielectric constant . Meanwhile, BT on the surfaces of cMWCNT reduce the direct contact of cMWCNT, resulting in reduced dielectric loss. More important, the BT and cMWCNT had a synergistic effect on dielectric permittivity of the cMWCNT-BT/PDMS composite. Therefore, the dielectric properties of the novel ternary composite can be improved by optimizing the synergistic effects between the charge storage behavior of the ferroelectric phase and the charge transport behavior of the conductive phase.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2018
·
IF 5.018
Bo Xiang,Jun Zhang
Although barium titanate (BaTiO 3 , BT) has been extensively used in manufacturing electronic materials, less attention has been paid to the area of cool material. Herein, BT was first used as solar heat-reflective pigment, aiming to be possibly applied in cool roof for cooling purpose. Specifically, four types of BT with different particle size were added into acrylonitrile-styrene-acrylate copolymer (ASA) matrix to fabricate composite cool materials. The solar reflectance and cooling effect were investigated by ultraviolet-visible-near infrared (UV–Vis–NIR) spectral measurement and temperature test, respectively. The results of the solar spectral measurement suggested that the addition of BT particles significantly improved NIR reflectance of ASA by 2–3 times. Besides, the total solar reflectance firstly increased with the increasing average particle size up to 406 nm and then leveled off. Meanwhile, a significant decrease (about 10 °C) was achieved in the indoor temperature test when BT particles were introduced. As for the outdoor temperature test, the final temperature of ASA/BT (406 nm) and ASA/BT (1068 nm) was different though their solar reflectance values were close, indicating that the temperature test was a great complementary instrument of the solar spectral measurement.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lishun Yang,Fukang Chen,Dezhao Meng,Qin Li,Meng Qi,Xinyu Chen,Kun Yu,Quan Li,Jingang Yang,Chunlin Song,Gang Liu,Lixue Zhang,Li Jin,Yan Yan
In this study, the viscous polymer processing (VPP) technique is implemented to optimize the characteristics of bulk (1- x )BaTiO 3 - x Bi(Mg 0·5 Ti 0.5 )O 3 (BT- x BMT) lead-free relaxor ferroelectric ceramics , with a focus on enhancing the recoverable energy storage density ( W rec ), improving breakdown strength resistance ( E b ), and increasing storage efficiency ( η ). The influence of polyvinyl alcohol (PVA) inclusion in the VPP process on the resulting dielectric ceramics is thoroughly investigated, covering rheological, dielectric, and ferroelectric properties . The results reveal that a gradual increase in PVA quantity during the VPP process effectively improves the density of ceramic blanks. However, an excess of PVA leads to void formation in the ceramic blanks post-debinding, hindering the achievement of a dense structure in the final ceramics and causing performance degradation. The resulting BT-0.405BMT-40 wt% PVA ceramic showed excellent storage performance, with W rec , η , and E b of 6.55 J/cm 3 81.45 %, and 480 kV/cm, respectively. In comparison to bulk BT-0.405BMT ceramics, there is a notable 2.47-fold increase in W rec and a 1.92-fold increase in E b , accompanied by a substantial improvement in η . Moreover, the BT-BMT-40 wt% PVA ceramic exhibits favorable temperature stability (30–150 °C), frequency stability (1–50 Hz), and commendable charge/discharge performance.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Saiwei Luan,Huizhan He,Yifan Zhao,Jie Yu,Xiuhua Cao,Jingxi Wang,Zhenxiao Fu,Lei Zhang,Rong Sun
The microstructural design of BaTiO 3 -based ceramics plays a critical role in achieving high dielectric stability and reliability for advanced multilayer ceramic capacitors (MLCCs). In this work, we systematically investigate the synergistic effects of sintering temperature and initial BaTiO 3 particle size on the formation of core–shell structures and their impact on dielectric performance. By employing commercial BaTiO 3 powders with particle sizes ranging from 100 to 250 nm and optimizing sintering conditions, a well-regulated core–shell architecture is constructed via a combination of solid solution–diffusion and dissolution–precipitation mechanisms. Microstructural and compositional analyses reveal that excessively fine powders or insufficient sintering temperatures disrupt shell formation, while moderate particle sizes and elevated sintering temperatures promote shell uniformity and dopant segregation at grain boundaries. These features result in enhanced dielectric relaxation, stabilized capacitance-temperature characteristics, and suppressed oxygen vacancy migration. The sample exhibited the optimal performance, achieving a dielectric constant of 1850, a dielectric loss of 0.017, and minimal capacitance variation, which satisfies the X8S standard. Impedance spectroscopy indicated a high activation energy for oxygen vacancy migration in grain boundaries, implying superior electrical reliability. This work offers valuable insights into the structure–property relationship of BaTiO 3 ceramics and emphasizes the role of sintering–particle size synergy in designing reliable dielectrics for advanced MLCCs.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 20
·7386-7397
·
IF 5.7
Wei Wu,Xiaohui Sun,Dong Wang,Haining Qian,Bo Wang,Xiangwei Wang,Xianhui Rong,Xuyang Zhang,Guohua Wu
To address the challenge of high switching voltages in polymer dispersed liquid crystal (PDLC) films, BaTiO3 nanoparticles of various dimensions were incorporated into a PDLC matrix. This study utilized a polymerisation-induced phase separation (PIPS) method, employing a UV curable photopolymer (NOA65), nematic liquid crystals (E7), and BaTiO3 (BTO) nanoparticles in zero-dimensional (0-BTO), one-dimensional (1-BTO), and two-dimensional (2-BTO) forms. The integration of different dimensional BTO nanoparticles significantly influenced the dielectric properties of the PDLC films, as demonstrated by the micro-morphology and electro-optical performance analysis. Notably, the incorporation of 1-BTO nanoparticles resulted in the lowest saturation voltage of 17 V, a 58% reduction, attributed to the increased dipole moment. Additionally, the introduction of 1-BTO nanoparticles did not compromise the transmittance and long-term cycling stability of the PDLC films.
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Frontiers of Materials Science
·
2023
·Vol. 17
·期 3
·1-13
·
IF 2.7
Bo Ruitian,Wang Chunfeng,Wang Yongliang,He Peigang,Han Zhidong
The layer-structured composites were built by the dielectric and insulating layers composed of polyvinylidene fluoride (PVDF) and low-density polyethylene (LDPE) composites containing barium titanate (BT) to modulate the dielectric and energy storage properties of the composites. The simulations on the interface models for molecular dynamics and the geometric models for finite element analysis were performed together with the experimental characterization of the morphology, dielectric, and energy storage properties of the composites. The results revealed that polyethylene as an insulating layer played a successful role in modulating dielectric permittivity and breakdown strength while BT particles exerted positive effects in improving the miscibility between the composed layers and redistributing the electric field. The strong interface binding energy and the similar dielectric permittivity between the PVDF layer and the BT20/LDPE layer made for the layer-structured composites with a characteristic breakdown strength ( E b ) of 188.9 kV·mm −1 , a discharge energy density ( U d ) of 1.42 J·cm −3 , and a dielectric loss factor (tan δ ) of 0.017, which were increased by 94%, 141%, and decreased by 54% in comparison with those of the BT20/PVDF composite, respectively.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·469-477
·
IF 5.693
Wang Ziman,Gao Yin,Ma Yu,Xie Xixi,Yang Ming,Zhang Hang
This paper investigates the electrocaloric effect (ECE) in polymer nanocomposite films containing ferroelectric poly (vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE)] terpolymer matrix and lead-free nanopowders. The nanopowders include pure BaTiO 3 and rare-earth substituted Ba 0.94 R 0.04 TiO 3 , where R = La, Nd, Sm, prepared by a modified sol-hydrothermal method. The substitution influences the lattice parameters, but all samples exhibit a perovskite-type tetragonal phase. The dopant enhances the relaxation behavior of the matrix and decreases the current. Using the Maxwell equations, the ECE performance is systematically studied for all samples. As the rare-earth ionic radius decreases, the Curie temperature of the nanocomposite increases and the dielectric constant decreases. The isothermal entropy changes (Δ S ), adiabatic temperature changes (Δ T ), cooling energy densities ( Q ), and electrocaloric strengths versus temperature exhibit different dependences on electric field ( E ). The results demonstrate that rare-earth doping can effectively modify the ECE. Our composites achieve large EC strength values (|Δ T |/|Δ E |) of 7 to 21 μK m kV −1 over a wide temperature range of 25 to 60 °C and electric field range of 750 to 1250 kV cm −1 and provide typical examples of polymer ECE materials containing rare-earth doped nanopowders. Graphical abstract The preparation of the polymer nanocomposites and the adiabatic temperature changes and the corresponding electrocaloric strengths of the samples.
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