ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shuai Chen,Ting Wang,Shaoxiong Xie,Jiaju Leng,Qingfeng Zhu,Kai Li,Weiping Gong,Jianguo Zhu,Qingyuan Wang
Dielectric capacitors are employed extensively due to their exceptional performance, including a rapid charge–discharge speed and superior power density. However, their practical implementation is hindered by constraints in energy-storage density (ESD), efficiency (ESE), and thermal stability. To achieve domain engineering and improved relaxor behavior in 0.67BiFeO3-0.33BaTiO3-based Pb-free ceramics, the concerns have been addressed here by employing a synergistic high-entropy strategy involving the design of the composition of Sr(Mg1/6Zn1/6Ta1/3Nb1/3)O3 with B-site multielement coexistence and high configuration entropy. Remarkably, in (0.67-x)BiFeO3-0.33BaTiO3-xSr(Mg1/6Zn1/6Ta1/3Nb1/3)O3 ceramics with x = 0.08, a good ESE (η) of 75% and a recoverable ESD (Wrec) of 2.4 J/cm3 at 190 kV/cm were attained together with an ultrahigh hardness of ∼7.2 GPa. The high-entropy strategy, which is tailored by an increase in configuration entropy, can be attributed to the superior mechanical and ES properties. It also explains the enhanced random field and relaxation behavior, the structural coexistence of ferroelectric rhombohedral (R3c) and nonpolar pseudocubic (Pm-3m) symmetries, the decreased domain size, and evenly distributed polar nanoregions (PNRs). Moreover, improved thermal stability and outstanding frequency stability are also obtained. By boosting the configuration entropy, BiFeO3–BaTiO3 materials dramatically improved their complete energy storage performance. This suggests that designing high-performance dielectrics with high entropy can be a convenient yet effective technique, leading to the development of advanced capacitors.
研究领域:
材料科学
·
能源工程
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 119
·期 6
·
IF 2.101
Shi Xin Xin,Liu Xiao Qiang,Chen Xiang Ming
The evolution of structure, ferroelectric, and piezoelectric properties in Bi 1−x Sm x Fe 0.99 Ti 0.01 O 3 ceramics was extensively investigated within the entire morphotropic phase boundary region with 0 ≤ x ≤ 0.20. A sequential phase transition of R3c-Pna2 1 -Pbnm with increasing Sm content was revealed by Rietveld refinement of the X-ray diffraction data together with the macroscopic ferroelectric measurements. Both ferroelectric and piezoelectric properties showed a great enhancement in the vicinity of the R3c/Pna2 1 (polar-to-polar) phase boundary, which should be caused by the field-induced phase transition between these two phases. Such field-induced phase transition might be essentially accompanied by a change of magnetic state, which indicated a way of controlling magnetism by means of electric field.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
LANGMUIR
·
2026
·Vol. 42
·期 30
·22067-22077
·
IF 4.4
He Fu,Zhou Jiahong,Guan Hongwei,Chen Yuejia,Li Zhuo,Xu Tiefu
Heterogeneous photo-Fenton technology is an efficient
advanced
oxidation process for the removal of organic pollutants in water.
This process accelerates the reduction of Fe 3+ to form
Fe 2+ by photoelectrons (e – ), thereby
enabling the sustained generation of reactive oxygen species (ROS)
for pollutant removal. In this study, a BiVO 4 /BiFeO 3 (BVO/BFO) n-p heterojunction catalyst was obtained via calcination
and wet chemical methods for tetracycline (TC) photo-Fenton removal.
The optimal ratio of BVO:BFO was 0.7:1, which can achieve 70.08% TC
degradation in 30 min ( k = 0.0147 min –1 ), markedly surpassing bare BFO and BVO, and retaining >70% efficiency
after ten cycles. The remarkable improvement of TC removal resulted
from efficient electron–hole (e – /h + ) pair separation by heterojunction in space to regenerate Fe 2+ for H 2 O 2 activation. Furthermore,
two distinct TC degradation pathways induced by h + and • OH were proposed, including dehydroxylation, demethylation,
deamidation, ring opening, and hydroxylation. This study provides
an insight into the acceleration of the Fe 3+ /Fe 2+ cycle and broadens the application of Fenton technology in the field
of environmental remediation.
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PubMed
高影响因子
Journal of Science-Advanced Materials and Devices
·
2026
·Vol. 11
·期 3
·101207
·
IF 6.9
Lu Yang,Junjie Li,Jianzi Xu,Kun Zhang,Chunxin Ma,Wenjuan Wu,Xing Zhang
Lead-free piezoelectric ceramics with high Curie temperature are urgently demanded to replace toxic lead-based materials for environmental sustainability, among which BiFeO 3 –BaTiO 3 (BF-BT) systems show promising potential. Although chemical substitution is widely adopted to modulate properties, achieving balanced electromechanical performance in BF-BT ceramic remains challenging due to the complexity of A-site cations (Bi 3+ and Ba 2+ ) with different valence states and ionic radii. Herein, we systematically investigated site-selective Sm 3+ substitution effects on structure and properties of BF-BT ceramics. Bi-site substitution promoted grain growth and reduced leakage current via suppressed bismuth volatilization, while Ba-site substitution refined grains but severely disrupted ferroelectric ordering due to charge imbalance. Furthermore, 2/3Bi 0.995 Sm 0.005 FeO 3 -1/3BaTiO 3 (BF-BT-Bi-Sm0.005) achieved optimized comprehensive performance, exhibiting a piezoelectric coefficient of d 33 = 87 pC/N, mechanical quality factor of Q m = 101.5, Curie temperature of T m = 394 °C, and low leakage current density. These results demonstrate that low-level Bi-site substitution effectively coordinates defect chemistry, microstructure, and domain engineering to achieve superior electromechanical coupling, providing a rational design strategy for high-performance lead-free ceramics suitable for high-temperature sensing applications.
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高影响因子
PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Dongxue Luo,Ronghua Qin,Minghang Song,Lingfang Xu,Tian Liang,Yalong Ge,Changping Yang
BiFeO 3 has profuse physical properties in multiferroics. However, significant leakage current constrains its utility in practical applications. In this paper, we synergistically embed BiFeO 3 nanoparticles in a ferroelectric crystal P(VDF-TrFE) base and use barrier layers to reduce the leakage current and promote the ferroelectric performance. Our finding indicate that the multilayer BiFeO 3 /P(VDF-TrFE) composite films equipped with barrier layers exhibit a leakage current below the magnitude of microampere level, a 99 % reduction compared to single-layer films. Additionally, the effective remnant ferroelectric polarization reaches 16 μC/cm 2 , a 66 % improvement. We combined the conductive mechanism analysis by fitting I - V curves and constructing energy band structures, uncovering that the essence of the optimization characteristics is related to a Space-Charge-Limited Conduction (SCLC) mechanism in the multilayer composite films. This research offers potential film solutions for a variety of electrical devices, supported by both experimental and theoretical perspectives.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yu Sun,Juan Liu,Tulai Sun,Zilong Yu,Ziyang Zheng,Mengru Ge,Lihong Bai
In this study, multiple rare earth elements were introduced to modify the multiferroic properties of BiFeO 3 . The effects of co-substitution on the structural evolution and properties were thoroughly investigated. With increasing substitution content, the ceramics underwent a symmetry transition from R 3 c to Pna 2 1 and finally to Pbnm . Co-substitution significantly enhanced the ferroelectric properties, with the highest remanent polarization of 33.14 μC/cm² observed at x = 0.10. Due to the symmetry evolution, ferromagnetism was released from the cycloidal spin structure, and the hysteresis loop gradually saturated, with the highest remanent magnetization ( M r ) of 0.25 emu/g observed at x = 0.16. The concurrent improvement in ferroelectricity and ferromagnetism resulted in substantial magnetoelectric coupling performance, with α ME = 3.50 mV/(cm·Oe). Moreover, direct current poling significantly induced the reverse transition from R 3 c to Pna 2 1 , indicating the potential for electrically controlled magnetism. This study provides a new perspective for modifying the magnetoelectric properties of BiFeO 3 .
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zengpeng Li,Jianfeng Dai,Danqiang Huang,XinChao Wen
BiFeO 3 –(Co/Ni)Fe 2 O 4 (BFO–(C/N)FO) multiferroic nanofibers were synthesized using a self-assembly coaxial electrospinning technique . The structure, exchange bias effect, ferromagnetic, and ferroelectric properties were investigated using various physical and chemical characterization approaches. The coexistence of a spinel–perovskite mixed structure was verified in (BFO–(C/N)FO) nanofibers by X-ray diffraction and X-ray photoelectron spectroscopy . Raman spectra revealed a distorted crystal structure or more complex phase configurations with overlapping features. Compared to the pure BFO nanofibers, the magnetic properties showed a significantly increase after recombination. BFO–NFO nanofibers exhibited higher exchange coupling through switching field distribution analysis. The ferroelectric properties of the composite nanofibers were considerably changed compared to pure BFO nanofibers, which can be attributed to the presence of impurities (Bi 2 Fe 4 O 9 ) and the asymmetrical spin in spinel ferrites. The BFO–CFO nanofibers exhibited larger leakage current and coercive electric field than the other two types of nanofibers. Hence, coupling of the structural distortion and crystal phases are important approaches in altering the ferroelectric and ferromagnetic properties. These results suggest that the BFO–(C/N)FO nanofibers have potential applications in multifunctional nanodevices .
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 9
·6807-6813
·
IF 1.569
Guan Xiao Ying,Qiao Zhong Wang,Yan Deng Zhou,Sun Yan Fei,Li Jin
This study reports the effect of Nd-doping on structural, morphological and optical properties of BiFeO 3 synthesized by hydrothermal method. The X-ray diffraction’s results indicate that the samples possess single phase up to 12.5 % Nd doping at the Bi site, and all the samples were pure phase microcrystal having a perovskite structure with a space group of R3c. Through the scanning electron microscope, we find that the particles are nearly spherical morphology and the size decreases with Nd doping. The study of Fourier transform infrared spectroscopy confirms the formation of perovskite structure of prepared BiFeO 3 . Photoluminescence spectroscopy shows Nd doping enhanced the Photoluminescence intensity. Ultraviolet–visible absorption spectrum shows BiFeO 3 have a wide absorption band in 550–650 nm wavelength range. The corresponding energy band gap of the samples decreases with the increase of Nd-doping concentration. BiFeO 3 valence band electrons will be excited to the conduction band when the wavelength of visible light is 600–800 nm. It can be used in visible light catalysis. The value of remnant magnetization has improved due to the continuing collapse of the space-modulated spin structure of Bi 0.925 Nd 0.075 FeO 3 microcrystals.
研究领域:
材料科学
·
凝聚态物理
·
纳米材料
·
功能材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 47
·24439-24453
·
IF 3.9
Wang Yabo,Duan Xiaohui,Wei Yiguo,Du Gangfeng,Tian Zhengshan,Bai Suzhen,Pan Zihong,Bai Ruibing
An efficient Ag 2 WO 4 /BiFeO 3 heterojunction was successfully synthesized using a facile hydrothermal and in situ precipitation method. A comprehensive investigation was conducted into the morphological, structural, and optical properties of the Ag 2 WO 4 /BiFeO 3 heterojunction. The optimally synthesized Ag 2 WO 4 /BiFeO 3 heterojunction demonstrated an impressive removal efficiency toward Lanasol Red 5B (95.62%) within 100 min under simulated solar irradiation, which was 5.18-fold higher than pristine BiFeO 3 . The engineered heterojunction effectively optimized the electron transfer pathway, significantly enhancing the separation efficiency of photogenerated electrons and holes. A notable selectivity of the Ag₂WO₄/BiFeO₃ heterostructure was observed in the photocatalytic degradation of organic dyes under simulated solar irradiation. The removal efficiencies followed the order: Lanasol Red 5B (95.62%) > Congo red (50.47%) > Methyl red (47.16%) > Safranin T (22.22%) > Rhodamine B (8.07%) > Methyl orange (3.04%). Furthermore, active species trapping experiments confirmed that holes and superoxide radicals were the predominant reactive species driving the photocatalytic process. This simple synthesis method opens up new possibilities for developing efficient BiFeO 3 -based photocatalysts for environmental remediation purposes.
研究领域:
材料科学
·
环境修复
·
光催化
·
纳米材料
·
化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2013
·Vol. 28
·期 11
·1498-1504
·
IF 1.713
Zhi Wang,Wenfei Xu,Hui Peng,Xiaodong Tang
In this work, the morphology of BiFeO3 was successfully modulated from microsphere to microcube by using a polyanion, poly (methyl vinyl ether-alt-maleic acid) (PMVEMA), in a microwave assisted hydrothermal route. A simple ultrasonic purification method has been developed to obtain pure phase BiFeO3 from the crude products without using any chemicals. X-ray diffraction results confirmed the capability of this purification method. When increasing the amount of PMVEMA, the morphology of BiFeO3 gradually changed from microsphere to microcube as illustrated by scanning electron microscopy. A mechanism was suggested for the morphology evolution of BiFeO3. After the formation of the small BiFeO3 single crystal, PMVEMA preferentially absorbed on one side of the crystals through specific and/or noncovalent interactions, resulting in the preferential integration of these crystals to form microcubes. The magnetic properties of these microcrystals were also investigated and the magnetization of the microcubes increased with the decrease of temperature.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 4
·1215-1224
·
IF 7.779
Jiaqi Ding,Hangren Li,Guoqiang Xi,Jie Tu,Jianjun Tian,Linxing Zhang
The wide band gap of bismuth ferrate-based materials limits their application in optoelectronic devices, and how to achieve band gap modulation in the simplest manner is the primary requirement for their industrialization. BiFeO3 (BFO) films can achieve narrower bandgaps than those under substrate strain, interphase strain, or chemical strain. In this study, we have achieved simultaneously increased tetragonality and reduced bandgaps in the tetragonal-like phase BFO-based films through chemical strain. Co substitution can be controlled by both stoichiometric ratios and atomic deposition rates. The tetragonality can increase up to a large c/a of 1.239, and the bandgap can decrease to 1.45 eV from 2.21 eV. The oxygen vacancies are closely related to the decrease of the band gap. Density functional theory calculations indicate that the introduction of Co and oxygen vacancies essentially reduced the conduction band bottom, resulting from the hybridization energy levels of Co 3d and O 2p, respectively. This paper provides a new strategy for the regulation of the optical band gap of BFO and further reveals its underlying mechanism.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiajia Long,Tingting Ren,Jun Han,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jianmei Lu
Piezocatalysis converting mechanical energy into chemical energy is deemed as an emerging technology for degradation of organic pollutants in water or air. In this work, BiFeO 3 @CdS nanofibers with heterostructure and enhanced piezoelectric response were prepared for efficient piezocatalytic degradation of organics in water. The optimal BiFeO 3 @CdS-10% achieved nearly complete removal of bisphenol A (BPA) within 60 min with the degradation rate constant of 0.098 min −1 , which was 9.4 and 4.9 times higher than that of pristine BiFeO 3 and CdS, respectively. The excellent piezocatalytic activity of the composite can be attributed to the construction of heterojunction and the enhanced piezoelectric response from the synergistic effect of the two piezoelectric components, which can accelerate the internal transfer of free carriers. It gives an insight into the feasible construction of efficient piezocatalysts and opens up a new way for BiFeO 3 -based piezoelectric materials to be utilized in purification of wastewater.
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高影响因子
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