Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 37
·12561-12569
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IF 6.4
Chen Xi Li,Xiang Li,Xin Yi Chen,Chen Chen,Lei Zhao,Nan Ma
Ferroelectric materials possess piezoelectric, pyroelectric, and photovoltaic properties simultaneously, making them ideal for use in multi-sensor applications. However, it has been challenging to balance the photovoltaic properties with piezoelectric/pyroelectric properties within a single material due to the narrow bandgap and ferroelectricity being incompatible. In this study, Ti3+ self-doping in BaTiO3 (BTO) ceramic is proposed as a solution to reduce the bandgap while maintaining the ferroelectric properties. The influence of Ti3+ self-doping on the piezoelectric, pyroelectric, and photovoltaic properties was systematically investigated. It was found that Ti3+ self-doping not only reduces the bandgap but also enables good ferroelectric properties in BTO. This results in a piezoelectric coefficient of 75 pC/N, a pyroelectric coefficient of 59 μC m−2 K−1, and a significant increase in photocurrent by 672.7% under 405 nm illumination. Therefore, Ti3+ self-doped BTO exhibits great potential for multisensory applications for detecting contact force, temperature, and light. These findings provide a new approach to expanding the application of multifunctional ferroelectric materials.
研究领域:
材料科学
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铁电材料
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传感器
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光伏
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陶瓷
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Wang,Zhong Yang,Jianyong Jiang,Chaoyong Deng,Kongjun Zhu
Flexible dielectric materials with benign energy storage performance are highly desirable for the miniaturization, portability and integration of modern electronics. However, the limited energy storage density seriously restricts their practical applications. Herein, multilayered composite films composed of the P(VDF-HFP) matrix and Nd doped BaTiO 3 nanofibers with various filling ratios, layer numbers and topological structures were systematically designed and constructed via the layer-by-layer non-equilibrium process. The 3-layered composite films (3.0 wt% filling ratio) with the pure P(VDF-HFP) layer adjacent to the electrodes revealed good mechanical behavior, greatly enhanced captured ions at interfacial regions and suppressed injected charges from electrodes, which facilitated the improvement of the breakdown strength and discharged energy density. And a maximum U e of 25.5 J/cm 3 with a E b of 719.9 MV/m was achieved, which was not only 1.4 times more than the pure P(VDF-HFP) via the same process, but also behaved better than counterparts with the similar filling ratios and was among the top U e values of related P(VDF-HFP)-based nanocomposites.
研究领域:
材料科学
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介电材料
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能量存储
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纳米复合材料
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聚合物基复合材料
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 2
·e20155
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IF 3.5
Xing Zhao,Minghui He,Xinyu Zeng,Qin Li,Guanghua Wu,Fukang Chen,Shaofei Zhang,Jinfeng Sun,Alexander N. Vtyurin,Yan Yan,Haibo Zhang,Gang Liu
Despite being the key component in modern electronic devices or power systems, ceramic dielectric capacitors have drawbacks like low energy storage density and efficiency that limit their extensively wide application. This work adopted a different route to improve energy storage performance compared with the frequently utilized composition modification. 0.98Ba 0.65 Sr 0.245 Bi 0.07 TiO 3 -0.02Ce Pb-free ceramics with different polyvinyl alcohol (PVA) contents were prepared through viscous polymer processing. The rheological and energy-storing performance were systematically studied. It can be seen that high PVA content results in more pores and larger grain sizes that will deteriorate the breakdown strength of ceramics. The highest breakdown strength reached 420 kV/cm while the concentration of PVA was 5 wt%. The mechanism of grain sizes on breakdown strength is studied by electrical tree simulation based on COMSOL. Viscous polymer processing with proper PVA content is very effective in generating dense and homogenous structures. Finally, the ceramic with 5 wt% PVA possesses a high density of up to 4.41 J/cm 3 and an efficiency of about 84.21% at 420 kV/cm. Simultaneously, this ceramic improved stability of both temperature (30–150°C) and frequency (1–300 Hz) at 350 kV/cm, while the η kept above 90% and W rec exceeding 3.6 J/cm 3 .
研究领域:
材料科学
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陶瓷工程
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介电材料
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能量存储
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电子器件
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Frontiers in Materials
·
2023
·
IF 3.2
Ye Chao,Li Chengui
A type II band aligned BaTiO3/CeO2 photocatalysts was constructed by a simple one-step solution synthesis method. The BaTiO3/CeO2 photocatalysts contain only cubic phase BaTiO3 and CeO2, and the particles are approximately spherical with a small amount of adhesion and agglomeration, and the average particle size is about 50 nm. Transmission electron microscopy (TEM) observation and element Mapping characterization confirmed the formation of special heterojunction between BaTiO3 and CeO2 and the presence of a large number of oxygen vacancies, which resulted in high visible optical absorption coefficient. The BaTiO3/CeO2 photocatalysts demonstrated high photocatalytic activity for the degradation of oxytetracycin hydrochloride, and the optimal drug concentration, catalyst content and pH value are 50 mg/L, 1 g/L and 7, respectively. Simultaneously, the BaTiO3/CeO2 photocatalysts were selective for degradation of aureomycin hydrochloride, doxycycline hydrochloride and tetracycline hydrochloride. Other photocatalytic experiments show that the BaTiO3/CeO2 photocatalysts have high chemical and cyclic stability, and the synergistic effect of holes, hydroxyl radicals and superoxide radicals plays an important role in the whole photocatalytic process. This simple synthesis route provides a technical reference for constructing other wide-band gap semiconductors to respond to simulated sunlight.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Guoqiang Luo,Ganrong Zhang,Luo Bai,Ying Zhang,Yuxin Fan,Yuzhe Han,Xiaoping Guo,Meijuan Li,Rong Tu,Qiang Shen
Tetragonal BaTiO 3 (BT) powder with appropriate size and dispersity is essential for the dielectric layers in multilayer ceramic capacitor technology. In this work, high tetragonality BT powder with controllable dispersion, and particle size was synthesized using combined dispersants and a two-step hydrothermal method . Owing to the synergistic effect of chemical bond force and electrostatic adsorption force between cetyltrimethylammonium bromide (CTAB) and polyvinyl-pyrrolidone (PVP) composite dispersants at a high temperature, the ultrafine BT powder with a high c/a of 1.0090, small size of 236 ± 15 nm and low polydispersity index of 0.336 was achieved. This idea shows great significance for the synthesis of BT powder with high tetragonal, high dispersion, and small particle sizes.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhen Wang,Jianping Xu,Shaobo Shi,Jing Chen,Jianghua Xu,Lina Kong,Xiaosong Zhang,Lan Li,Shougen Yin
One-dimensional (1D) metal oxides with excellent carrier transport and light absorption properties can be applied to photodetectors (PDs), facilitating device miniaturization, portability, and integration. Surface modification of 1D semiconductors can reduce carrier recombination in PDs as a way to increase photocurrent and decrease dark current of PDs. Herein, ultrathin BaTiO3 (BTO) shell layers are grown on the surface of TiO2 nanorod arrays (NRs) by in situ conversion using hydrothermal reaction, and the self-powered TiO2-BTO NRs PDs are constructed. The effect of the thickness of BTO shell layers on the photoresponse characteristics of self-powered TiO2-BTO NRs PDs is investigated by controlling the Ba2+ conversion concentration. The results show that the BTO shell layer reduces the dark current of the PDs because of the decreased interfacial transfer resistance and improved transfer of photogenerated carriers for building a “bridge” of carrier transport between BTO and TiO2 due to the formation of Ti–O–Ti bonds. Moreover, the presence of the spontaneous polarization electric field in BTO enhances the photocurrent and response speed of PDs. The self-powered TiO2-BTO NRs PDs are integrated in series and parallel to realize the functions of “and” and “or” gates of light-controlled logic gates. The ability to convert light signals into electrical signals for the self-powered PDs in real time demonstrates its great potential for optoelectronic interconnection circuits, which has important application prospects in the field of optical communication.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Gongwen Gan,Yaqin Yin,Zongliang Zheng,Yunjing Wang,Xi Zhang,Gaojie Zou,Zhongyin Zhu,Guoqing Gou
Two phase-based composites comprising barium titanate (BaTiO 3 ) and spinel magnesium ferrite (1- x )Mg 0.7 Cd 0.3 Fe 2 O 4 + x BaTiO 3 (x = 0.00, 0.03, 0.06, 0.09, and 0.12) were investigated. The phase structure revealed the coexistence of the perovskite BaTiO 3 and spinel MgFe 2 O 4 phases. The microstructural analysis indicated that the average crystallite size initially increased and then decreased, as the increase in x weakened magnetisation, decreased saturation magnetisation (from 47.5 to 35.9 emu/g) and coercivity (150–0 Oe) were obtained, resulting in reduced permeability at low frequency. The permittivity gradually increased owing to tuning by barium titanate, which has strong dielectric properties , promising a relatively large miniaturisation factor. Further, low magnetic loss (tan δ μ ∼10 −2 ) and dielectric loss (tan δ ε ∼ 10 −2 to 10 −3 ) guarantee high quality factor. The low losses and enhanced dielectric properties of the as-synthesised composites could be conducive to improving the behaviour of such magneto-dielectric composite systems in microwave applications.
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APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 24
·
IF 4
Gong Xin,Li Guannan,Lin Hua,Zhou Zengjie,Tang Jianfeng,Lu Yuming
BiFeO 3 -BaTiO 3 (BFO-BTO)-based lead-free electroceramics have long been synthesized using the microwave sintering approach, but the resulting multiferroic performance has not been excellent. In this work, we report an attempt to achieve competitive ferroelectric properties in microwave-sintered x BFO-(1– x )BTO ( x = 0.6–0.8) ceramics. Adopting a sintering process with a short dwell time of 30 min at 970 °C, we obtain high-quality ceramics with a high density, pure perovskite structure, uniform element distribution, and coarse grains. Furthermore, the fabricated ceramics can reproduce the typical characteristics of pure BFO-BTO, including a morphotropic phase boundary (MPB), relaxor ferroelectric behavior, weak ferromagnetism, and enhanced ferroelectricity near the MPB. More remarkably, a large intrinsic remnant polarization P r as high as ∼28 μ C/cm 2 is achieved by combing the MPB-enhanced ferroelectricity and the advantages of microwave synthesis. The maximal P r accomplished here is competitive with that of the same bulk solid solution obtained via other fabrication approaches. Our study illustrates that microwave synthesis is a powerful approach with which to prepare high-performance BFO-BTO-based ceramics.
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InfoMat
·
2022
·Vol. 5
·期 1
·e12362
·
IF 24.798
Lu Wang,He Qi,Shiqing Deng,Lingzhi Cao,Hui Liu,Shuxian Hu,Jun Chen
Electrostrictive materials have wide applications in modern high-precision electronic devices. Driven by growing environmental concerns, there is demand for lead-free materials with superior electrostriction behaviors. In this study, we demonstrate a record-high electrostrictive coefficient of ~0.0712 m 4 C −2 in perovskite ferroelectric ceramics, along with hysteresis-free strain as well as excellent frequency and thermal stabilities, in lead-free BaTiO 3 -based ceramics through a polarization nanocluster design. By appropriately introducing Li + and Bi 3+ into the BaTiO 3 lattice matrix, the long-range ferroelectric ordering can be broken, and polarization nanoclusters can be formed, resulting in a relaxor state with concurrently suppressed polarization and maintained electro-strain. A three-dimensional atomic model constructed using advanced neutron total-scattering data combined with the reverse Monte Carlo method indicates the existence of Bi and Li segregations at the subnanometer scale, which confirms the prediction made by density functional theory calculations. Such a short-range chemical order destroys the long-range ferroelectric order of the off-centered Ti polar displacements and leads to the embedding of Li + /Bi 3+ -rich polar nanoregions in the Ba 2+ -rich polarization disorder matrix. Further, a completely reversible electric-field-induced lattice strain is observed, giving rise to pure electrostriction without hysteresis behavior. This work provides a novel strategy for developing lead-free relaxor ferroelectrics with high electrostriction performance.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Huanghui Nie,Limei Ruan,Lu Hu,Xinran Wang,Fukang Chen,Shuai Zhou,Yangyang Wang,Taotao Ai,Yan Yan,Gang Liu
(1- x ) (0.98Na 0.5 Bi 0.5 TiO 3 –0.01BaTiO 3 –0.01BiFeO 3 )– x CaTiO 3 (NBB- x CT) ceramics were produced using traditional solid-state synthesis methods. The surface morphology , domain structure, and electrical properties of the ceramic samples were systematically studied. In addition, the temperature and frequency stabilities of the NBB-15CT sample at 200 kV/cm were tested. Generally, NBB- x CT ceramics exhibit a typical single perovskite phase structure. The results indicate that the NBB-15CT ceramics showed a high energy density of 3.14 J/cm 3 at 250 kV/cm. The piezoresponse force microscopy (PFM) results showed that the addition of CT broke the macrodomains of the 0.98Na 0.5 Bi 0.5 TiO 3 -0.01BaTiO 3 -0.01BiFeO 3 ceramic and helped to form nanodomains, leading to an improved energy storage performance. The above performance indicates that the specimens possess very good temperature-and frequency-dependent energy storage performances at 30–150 °C and 1–100 Hz. Moreover, the electric energy storage and release in the NBB-15CT ceramic indicated that the power density could reach 55.30 MV/cm 3 at 180 kV/cm. Therefore, the NBB-15CT ceramic is a promising material for electrical capacitors.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Enzhu Lin,Jiang Wu,Zihan Kang,Ni Qin,Kanghui Ke,Dinghua Bao
Piezocatalysis is one of the green and promising catalytic technologies for the degradation of organic pollutants. Surface modifications such as exposed facet engineering and surface decoration of nanoparticles (NPs) are simple but useful enhancement strategies for a catalytic system. However, the synergistic effect and mechanism of facet engineering and dual-cocatalyst decoration on piezocatalytic activity are still ambiguous and more investigations are expected. Herein, the piezocatalytic activities of BaTiO3 (BTO) polyhedrons with anisotropic {001} and {110} facets and BTO cubes with isotropic {001} facets were compared. Furthermore, BaTiO3 (BTO) convex polyhedrons with selectively deposited Ag NPs and uniformly loaded Co3O4 quantum dots (QDs) are rationally synthesized through photochemical deposition. The individual and synergistic effects of Ag NPs and Co3O4 QDs on the piezocatalytic activities are systematically studied. It was found that dual-cocatalyst-modified BTO possesses the highest piezocatalytic activity in methyl orange degradation, with a reaction constant k of 0.0539 min–1, around 5, 2.2, and 1.3 times higher than that of nonmodified and Ag NP- and Co3O4 QD-modified BTO, respectively. Moreover, dual-cocatalyst-decorated BTO also exhibits excellent piezocatalytic performance in nondye pollutant degradation, with ∼100% tetracycline hydrochloride decomposed in 60 min. By analyzing the contribution, quantifying the amount of different free radicals, and comparing the chemical states of surface elements before and after piezocatalytic measurements, it was inferred that facet-dependent Ag NPs acted as efficient electron-transport sites, while uniformly loaded Co3O4 QDs served as hole-transfer sites to fully facilitate the migration of electrons and holes in a piezocatalytic reaction. This research presents a rational and effectual modification strategy to enhance the piezocatalytic activity of piezocatalysts and gives a thorough discussion of the enhanced mechanism.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Zhujun Jiang,Liying Cheng,Yong Zeng,Zijia Zhang,Yongtao Zhao,Peng Dong,Jimin Chen
A series of porous scaffolds of piezoelectric ceramic barium titanate (BaTiO 3 ) were successfully fabricated by Digital Light Processing (DLP) 3D printing technology in this work. To obtain a high-precision and high-purity sample, the debinding sintering profile was explored and the optimal parameters were determined as 1425 °C for 2h. With the increase of scaffolds porosity from 10% to 90%, the compressive strength and piezoelectric coefficient (d 33 ) decreased gradually. The empirical formulas about the mechanical and piezoelectric properties were obtained by adjusting BaTiO 3 ceramics with different porosity. In addition, the distribution of potential and stress under 100 MPa pressure were studied by the finite element method (FEM).
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