ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Changhong Yang,Yajie Han,Jin Qian,Panpan Lv,Xiujuan Lin,Shifeng Huang,Zhenxiang Cheng
A recent hot-spot topic for flexible and wearable devices involves high-performance nonvolatile ferroelectric memories operating under compressive or tensile mechanical deformations. This work presents the direct fabrication of a flexible (Mn,Ti)-codoped multiferroic BiFeO3 film capacitor with Pt bottom and Au top electrodes on mica substrate. The fabricated polycrystalline Bi(Fe0.93Mn0.05Ti0.02)O3 film on mica exhibits superior ferroelectric switching behavior with robust saturated polarization (Ps ∼ 93 μC/cm2) and remanent polarization (Pr ∼ 66 μC/cm2) and excellent frequency stability (1–50 kHz) and temperature resistance (25–200 °C), as well as reliable long-lifetime operation. More saliently, it can be safely bent to a small radius of curvature, as low as 2 mm, or go through repeated compressive/tensile mechanical flexing for 103 bending times at 4 mm radius without any obvious deterioration in polarization, retention time at 105 s, or fatigue resistance after 109 switching cycles. These findings demonstrate a novel route to designing flexible BiFeO3-based ferroelectric memories for information storage and data processing, with promising applications in next-generation smart electronics.
研究领域:
材料科学
·
电子器件
·
铁电学
·
柔性电子学
·
非易失性存储器
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Huicai Xie,Zhaojun Mo,Quanyi Liu,Hao Sun,Shengcan Ma,Xinqiang Gao,Jun Shen
EuTiO 3 exhibits various interesting physical properties, including magnetocaloric effect, quantum paraelectricity, magnetoelectricity, and multiferroic properties, thus attracting a broad range of attention from the researchers. The delicate balance between ferromagnetic coupling and antiferromagnetic interactions offers the feasibility of modulating the magnetic properties and magnetocaloric effect for this perovskite. Herein, a range of Eu(Ti,B)O 3 perovskites were prepared by substituting titanium with different amounts of boron. A comprehensive investigation on their structure, magnetism, magnetocaloric effect, and critical behavior was performed. All the compounds are confirmed to be crystallized in a single cubic perovskite structure with space symmetry of Pm 3 m , with the introduced boron uniformly distributed in the compounds. The transition temperatures are determined to be 6.0, 6.5, 5.0, and 5.0 K for EuTi 0.9375 B 0.0625 O 3 , EuTi 0.875 B 0.125 O 3 , EuTi 0.8125 B 0.1875 O 3 , and EuTi 0.75 B 0.25 O 3 , respectively. The results of both magnetic measurements and critical behavior analysis suggest that appropriate substitution of boron promotes the magnetic transition from AFM to FM in Eu(Ti,B)O 3 . In addition, significantly enhanced low-field magnetocaloric effects were observed in these perovskites. Under field changes of 0–1 and 0–2 T, the values of - Δ S M max are 14.7 and 26.4 J·kg −1 ·K −1 for EuTi 0.8125 B 0.1875 O 3 , 15.2 and 27.4 J·kg −1 ·K −1 for EuTi 0.75 B 0.25 O 3 , respectively.
研究领域:
凝聚态物理
·
材料科学
·
磁性材料
·
钙钛矿氧化物
·
固态化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Ying Zheng,Mingqiang Cheng,Xinyan Wu,Shuang Zhang,Zhu Liu,Yanqiang Li,Weiquan Shao,Qing Lin,Jinshan Tan,Shouwu Gao,Yongcheng Zhang,Wanneng Ye
Mechanical energy can be directly transformed into chemical energy by piezoelectric materials, namely, piezocatalysis, which is a potential tactic for renewable clean energy collection and environmental purification. The piezocatalytic efficiency strongly relies on the piezoelectric property and free charge concentration of piezocatalysts. Here, four samarium-doped (1 – x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 nanostructures were designed to investigate the correlation between the piezoelectric property and piezocatalytic performance. The diverse dye degradation efficiencies confirmed the high piezoelectric coefficient toward high catalytic activity. The degradation efficiency for acid orange 7 (AO7) was 100% within 20 min, while those for methyl orange (MO), methylene blue, and rhodamine B dyes were 97, 78, and 72%, respectively, within 40 min under ultrasonic vibration only. Furthermore, high catalytic efficiency of 96% was still maintained for AO7 degradation after 10 consecutive degradation cycles for samarium-doped 0.70Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 due to its high piezoelectric coefficient. The investigation of the catalytic mechanism demonstrated that hole and superoxide radicals were the primary active species toward AO7 degradation, whereas hydroxyl and hole radicals were for MO degradation. This work not only demonstrates the highly efficient catalytic activity of samarium-doped (1 – x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 nanostructures but also gives a deep comprehension of the correlation between the piezoelectric property and catalytic performance of piezocatalysts.
研究领域:
材料科学
·
环境催化
·
纳米材料
·
物理化学
·
能源材料
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·295
·
IF 38.5
Zeng Li,Jiang Chenhui,Li Yuan,Yin Hao,Li Qichao,Liu Hezhou,Guo Yiping
A monolithic, structurally flexible, continuous Pb(Zr 0.52 Ti 0.48 )O 3 (PZT) piezoelectric fiber was innovatively fabricated through network architecture design.
The PZT framework well inherited the macro- and micro-structure of the mesh fabric, endowing the PZT-silicone composite material with high stretchability up to 220%.
The developed strain sensor exhibited both high stretchability (100%) and high sensitivity (39.57 mV kPa −1 ), thus enabling its application in subtle surface roughness perception and large-strain human motion monitoring.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Dong Chen,Jinhui Li,Lihan Zhang,Kuan Wang,Manling Sui,Pengfei Yan
Biphasic composite materials have been demonstrated to be effective in enhancing the structural stability and electrochemical performance of layered cathodes for sodium-ion batteries. Herein, based on the cationic potential methodology and co-doping strategy, we design a biphasic O3/P2 composite layered cathode (85NFMLCC, Na 0.85 Ca 0.02 Ni 0.2 Li 0.1 Fe 0.15 Co 0.05 Mn 0.5 O 2 ) and further integrate surface modification to achieve superior cycling performance, which is prepared by a simple one-pot solid state sintering method. Comprehensive structural characterizations reveal that the surface modification is realized by an inner Co-enriched layer and an outmost Ca-coating layer, which enables much improved rate capability and cycling stability simultaneously. In situ XRD confirms that biphasic design effectively suppresses the harmful phase transition during high voltage cycling, and the bilayer surface modification further enhances the cathode interfacial kinetics and robustness. The electrochemical tests demonstrated that 85NFMLCC exhibits a high specific capacity (136.7 mAhg −1 at 0.1C), superior cycling stability and rate capability at 2.0–4.3 V, 97.8 % capacity retention after 100 cycles at 0.1C and 84.5 % capacity retention after 800 cycles at 1C 2.0–4.0 V. This work demonstrates that biphasic composite with proper surface modification is a very promising design route toward high performance high voltage cathode material for sodium-ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
Physical Review Materials
·
2017
·Vol. 1
·期 6
·064405
·
IF 0
Yu Feng,Wei-Li Li,Yang Yu,He-Nan Jia,Yu-Long Qiao,Wei-Dong Fei
An approach to greatly enhance the piezoelectric properties ($\ensuremath{\sim}400$ pC/N) of the tetragonal $\mathrm{BaTi}{\mathrm{O}}_{3}$ polycrystal using a small number of $A$-site acceptor-donor substitutions [D. Xu et al., Acta Mater. 79, 84 (2014)] has been proposed. In this study, $\mathrm{Pb}(\mathrm{ZrTi}){\mathrm{O}}_{3}$ (PZT) based polycrystals with various crystal symmetries (tetragonal, rhombohedral, and so on) were chosen to investigate the piezoelectricity enhancement mechanism. X-ray diffraction results show that doping generates an intrinsic uniaxial compressive stress along the ${[001]}_{\mathrm{pc}}$ direction in the $AB{\mathrm{O}}_{3}$ lattices. Piezoelectric maps in the parameter space of temperature and Ti concentration in the PZT and doped system show a more significant enhancement effect of $\mathrm{L}{\mathrm{i}}^{+}\text{\ensuremath{-}}\mathrm{A}{\mathrm{l}}^{3+}$ codoping in tetragonal PZT than in the rhombohedral phase. Phenomenological thermodynamic analysis indicates that the compressive stress results in more serious flattening of the free-energy profile in tetragonal PZT, compared with that in the rhombohedral phase. The chemical stress obtained by this acceptor-donor codoping can be utilized to optimize the piezoelectric performance on the tetragonal-phase site of the morphotropic phase boundary in the PZT system. The present study provides a promising route to the large piezoelectric effect induced by chemical-stress-driven flattening of the free-energy profile.
✓ 已验证
DOI
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 4
·809-819
·
IF 6.707
Yan Tianxiang,Chen Kaiyuan,Li Chengqi,Liu Min,Wang Jie,Fang Liang,Liu Laijun
(1− x )K 0.5 Na 0.5 NbO 3 − x Bi(Zn 2/3 Nb 1/3 )O 3 ((1− x )KNN− x BZN, x = 0.010, 0.015, 0.020, 0.025, and 0.030) lead-free ceramics were fabricated via a traditional solid-state method. The crystal structure, microstructure, dielectric, and conductivity behavior of this system were studied. Combined with X-ray diffraction (XRD) patterns, Rietveld refinement, and dielectric spectroscopy, an orthorhombic phase was determined for x = 0.010, an orthorhombic-tetragonal mixed phase was identified for x = 0.015, and a rhombohedral symmetry appears in 0.020 ⩽ x ⩽ 0.030. Both 0.98KNN−0.02BZN and 0.975KNN−0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent (tan δ ) in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to cubic. The activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly, then drop sharply, and finally decline slowly, which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yi Liu,Jing Huang,Yongfeng Gong,Xiaomin Xu,Hua Li
WO 3 is one of the inspiring sensing materials that show high response to O 3 ; an efficient fabrication of WO 3 film with incorporation of complementary additives is essential for enhanced sensitivity. Here we report film deposition by liquid flame spraying, characterization of nanostructured WO 3 -reduced graphene oxide (rGO) composites and their gas-sensing activities to O 3 . The starting feedstock was prepared from WC l6 and rGO for pyrolysis synthesis by flame spraying. Nano-porous WO 3 -rGO films were successfully fabricated and characterized by transmission electron microscopy , field emission scanning electron microscopy , Raman spectrometry , thermal analyses and X-ray diffraction. Nanosized WO 3 grains exhibited oriented nucleation on rGO flakes whereas rGO retained intact its nano-structural features after spraying. Constrained grain growth of WO 3 of 60–70 nm in size was realized in the rGO-containing films with as compared to ~220 nm in the pure WO 3 film. The WO 3 -rGO film sensors showed quicker response to O 3 and faster recovery than rGO-free WO 3 film sensors. Addition of rGO in 1.0 wt% or 3.0 wt% in the films caused a significantly reduced effective working temperature of the film sensors from ~ 250 °C to ~ 150 °C.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Zilong Zhao,Wenyi Dong,Hongjie Wang,Guanhan Chen,Wei Wang,Zekun Liu,Yaguang Gao,Beili Zhou
Elimination of hypophosphite (HP) was studied as an example of nickel plating effluents treatment by O 3 /H 2 O 2 and sequential Fe(II) catalytic oxidation process. Performance assessment performed with artificial HP solution by varying initial pH and employing various oxidation processes clearly showed that the O 3 /H 2 O 2 ─Fe(II) two-step oxidation process possessed the highest removal efficiency when operating under the same conditions. The effects of O 3 dosing, H 2 O 2 concentration, Fe(II) addition and Fe(II) feeding time on the removal efficiency of HP were further evaluated in terms of apparent kinetic rate constant. Under improved conditions (initial HP concentration of 50 mg L −1 , 75 mg L −1 O 3 , 1 mL L −1 H 2 O 2 , 150 mg L −1 Fe(II) and pH 7.0), standard discharge (<0.5 mg L −1 in China) could be achieved, and the Fe(II) feeding time was found to be the limiting factor for the evolution of apparent kinetic rate constant in the second stage. Characterization studies showed that neutralization process after oxidation treatment favored the improvement of phosphorus removal due to the formation of more metal hydroxides. Moreover, as a comparison with lab-scale Fenton approach, the O 3 /H 2 O 2 ─Fe(II) oxidation process had more competitive advantages with respect to applicable pH range, removal efficiency, sludge production as well as economic costs.
研究领域:
环境工程
·
废水处理
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Advanced Dielectrics
·
2022
·
IF 0
Chuan Chen,Yan Wang,Jiajiu Li,Chaofeng Wu,Guanrong Yang
A series of (100 − x ) Pb(Mg 1 / 3 Nb 2 / 3 ) O 3 − x PbTiO 3 (PMN − x PT, x = 24, 25, 26) ceramics were prepared by solid-state reaction technique using MgNb 2 O 6 precursor. The results of the detailed characterizations reveal that the content of PT has negligible influence on the grain size, and all samples possess the perovskite structure. As the PT content increases, the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room temperature. As a result, PMN– x PT ceramics are endowed with electro-strain of 0.08% at a relatively low electric field of 2 kV/mm, and effective piezoelectric coefficient of 320 pm/V was obtained. Simultaneously, the PMN– x PT ceramics have exceptional pyroelectric performance, exhibiting a high pyroelectric coefficient p ∼ 5.5 – 6.3 × 10 − 8 C⋅cm − 2 ⋅K − 1 . This study demonstrates the great potential of PMN– x PT for piezoelectric and pyroelectric device applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xue Zhang,Guoshuai Li,Feng Mao,Dongdong Han,Chengbin Jing,Ye Chen,Pingxiong Yang,Junhao Chu,Fangyu Yue
Doping- and temperature-induced phase transitions and optical/electric-properties for (1- x )KNbO 3 - x (Ba 0.5 Bi 0.5 )(Nb 0.5 Zn 0.5 )O 3 ceramics are studied. With the increase of x -value, a series of structural phase transitions from orthorhombic to tetragonal and to cubic is observed, and the phase transition temperatures are also improved for forming a stable phase. The deteriorated ferroelectric property , which also suggests the doping-induced phase transition due to the enhancement of the crystal symmetry , can be tentatively interpreted from the optical evolution with doping. This doping can introduce or enhance the bandedge- or in-gap states but without influence upon the optical bandgap of KNbO 3 . These results help in understanding the control of the structure, optical and electrical properties in KNbO 3 -based ferroelectric oxides.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Linying Yang,Shuwei Sun,Kai Du,Huiling Zhao,Dong Yan,Hui Ying Yang,Caiyan Yu,Ying Bai
Layered O3 type oxides exhibit promising prospects as high-performance cathodes for sodium-ion batteries (SIBs) due to their low cost and high theoretical capacities. Nevertheless, the intrinsic surface composition and bulk structure degradation upon cycling presents a huge obstacle to stable sodium-ion storage/transportation. Besides, the effective surface decoration on layered O3 oxides is still challenging through conventional wet chemical route owing to their extraordinarily high surface sensitivities. Herein, a typical O3 type layered oxide of NaNi 0.5 Mn 0.5 O 2 (NNMO) was selected and successfully encapsulated by precisely controlled Al 2 O 3 layers via atomic layer deposition (ALD) technology. With the optimally controlled Al 2 O 3 thickness of 3 nm, the surface regulated NNMO delivers a highly reversible capacity of 73.6 mA h g -1 , with a significantly improved capacity retention of 68.0% after 300 cycles at 0.5 C, and a superior rate capability of 65.8 mA h g -1 at 10 C. Further air sensitivity tests demonstrate that the protective layer could effectively mitigate the generation of sodium-based impurities on NNMO, and reduce the surface sensitivities. Both chemical and electrochemical aging tests confirm the contribution of Al 2 O 3 coating layer in alleviating ion dissolution as well as stabilizing the structure and morphology of NNMO. Based on regulating the surface of O3 type layered oxides utilizing ALD technique, this work supplies an effective and facile strategy to overcome the challenges from fast structure degradation and electrochemical property decay, which not only highlights the significance and effectiveness of surface engineering in secondary batteries, but also sheds light on accurate interface construction and regulation for active electrode materials, particularly for those sensitive to ambient atmosphere.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）