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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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
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环境修复
·
光催化
·
纳米材料
·
化学工程
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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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高影响因子
JOURNAL OF APPLIED PHYSICS
·
2021
·Vol. 130
·期 14
·
IF 2.546
Peng Xiao-Yan,Tang Yu-Cheng,Zhang Bo-Ping,Zhu Li-Feng,Xun Bo-Wei,Yu Jing-Ru
BiFeO 3 -BaTiO 3 is a promising high-temperature lead-free piezo-ceramics due to its high Curie temperature ( T C > 500 °C) and excellent piezoelectric properties. However, a high leakage current was often detected in this system, which severely affects its applications. In this work, the 0.7BiFe (1− x ) Ga x O 3 -0.3BaTiO 3 (BFGa x -BT, 0.00 ≤ x ≤ 0.10) system was designed to reveal the reason of leakage-current density decreased by their leakage mechanism. Because of the suppression of generation of Fe 2+ and oxygen vacancy ( V O ∙ ∙ ), the leakage mechanism from space charge limited conduction mechanism found in Ga-free BF-BT ceramics turns into Ohmic conduction and Schottky emission mechanism as Fe 3+ was replaced with Ga 3+ . A good combination of piezoelectric properties ( d 33 = 174 pC N −1 and k p = 29%) and high Curie temperature ( T C = 497 °C) was achieved in the BFGa0.06-BT ceramic owning the lowest leakage-current density. This work will provide the clues for preparing the high insulation and high piezoelectric performance BF-BT-based ceramics by suppressing the valence change of Fe 3+ and V O ∙ ∙ appearance.
研究领域:
材料科学
·
无机化学
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高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 4
·5498-5504
·
IF 2.605
Shizhou Pu,He Zheng,Zhenlian Chen,Meiya Li,Zhongqiang Hu,Jianbo Wang,Huamin Zou
The microstructures of Bi 0.85 Nd 0.15 FeO 3 ceramics were investigated by using transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), convergent-beam electron diffraction (CBED) and X-ray energy dispersive spectrometry (EDS). The superstructure phase related to 1/4( hh 0) p and 1/4(00 l ) p diffraction spots were observed in the samples. It is found that the superstructure phase can co-exist with R 3 c phase in a single grain. The bright and dark field images accompanied with SAED patterns provided evidences of the superstructure phase dispersed into the matrix with R3c symmetry and evolution of the domain. The ferroelectric domain wall was observed according to the displacement of Fe 3+ ions respect to Bi 3+ sub-lattice in the ferroelectric R 3 c phase based on HRTEM observations. The space group Pnam of the superstructure was identified by combining SAED and CBED techniques . EDS measurement revealed that the concentration of Nd in the Pnam phase is higher than that in R 3 c phase. This might mean that the transition from R 3 c to Pnam structure is due to the inhomogeneous distribution of the Nd concentration and the weakened stereochemical activity of Bi 3+ lone electron pair, arisen from the increase in Nd content.
研究领域:
材料科学
·
凝聚态物理
·
功能陶瓷
·
电子显微学
·
铁电材料
·
多铁材料
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Che Sun,Wenming Shi,Junjun Wang,Yingchun Liu,Danqing Liu,Fengmin Wu,Hongjun Zhang
BiFeO 3 -BaTiO 3 (BF-BT)-based ceramics with large piezoelectric coefficient are potential high-performance lead-free piezoelectric compounds. In this work, BF-BT based textured ceramics were constructed through the addition of 5 vol% (001) c oriented BT templates to the 70BF-30BT matrix. The high texture degree ( F ∼96 %) and relatively enhanced piezoelectric coefficient ( d 33 = 210 pC/N) were achieved in comparison with random BF-BT ceramics. EBSD were conducted to demonstrate the feasibility of texture engineering in BF-BT-based ceramics. Unlike the tradeoff between weakened Curie temperature ( T c ) and enhanced d 33 values via the doping strategy, T c in textured BF-BT ceramics showed no significant change ( T c = 510 °C). Meanwhile, textured BF-BT ceramics had a lower coercive electric field E c = 25 kV/cm but higher spontaneous polarization P s = 55 µC/cm² and remanent polarization P r = 54 µC/cm². Such enhanced piezoelectric properties of textured ceramics were mainly attributed to the combination of piezoelectric anisotropy along the [00 l ] direction and the 4 R engineering domain configuration. This work may provide a viable direction for the realization of high-temperature piezoelectric devices.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
压电材料
·
固态物理
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Xiguang Huang,Lingfang Xu,Jinyan Wang,Changping Yang,Haibo Xiao,Shiheng Liang,Ruilong Wang
We designed novel BiFeO 3 /P(VDF-TrFE) gradient structures and spun coating composite films on a fluorine-doped tin oxide (FTO) conductive glass substrate. A large remnant ferroelectric polarization of 29.5 μC/cm 2 , a 210 % improvement over the pure P(VDF-TrFE) film, is achieved by BiFeO 3 nanoparticles embedment, with the coercive electric field E c effectively restrained by 12 %. The structure analysis showed increased polar phase, reduced crystal size, and established long chains after BiFeO 3 gradient incorporation, which are essential to the ferroelectric performances. The finite element simulation by COMSOL software illustrated an apparent potential redistribution up to 342 MV/m at an external electric field of 160 MV/m and large leakage currents around BiFeO 3 , which reflect the heterogeneous regions formed at the interfaces and they are contributive to the micromorphology. These gradient composite films have potential in the low electric field driving flexible electronic devices.
研究领域:
材料科学
·
电子工程
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yanhong Gu,Jianguo Zhao,Weiying Zhang,Haiwu Zheng,Laimei Liu,Wanping Chen
Sm and Ti co-doped BiFeO 3 (BFO) ceramics with Fe vacancies—Bi 0.86 Sm 0.14 FeO 3 , Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 , and Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 —were prepared by a solid-state method using a rapid liquid process. X-ray diffraction indicated that all samples exhibited a rhombohedral structure with a minor secondary phase. The structural transformation from a rhombohedral (space group: R 3 c ) to orthorhombic structure (space group: Pnma ) was observed in the sample of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , which was also confirmed by Raman scattering spectra. Microstructural investigations with scanning electron microscopy showed a reduction in grain size with doping of BFO. The dielectric loss of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 reaches 0.05 (at 100 Hz) owing to the introduction of Ti and Fe vacancies. Ferroelectromagnetic measurements revealed the existence of ferroelectricity with a remanent polarization of 0.24 µC/cm 2 in Bi 0.86 Sm 0.14 FeO 3 , paraelectricity in Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , and weak ferromagnetism with a remanent magnetization of 0.2 emu/g in Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 . The two composition-driven phases exist simultaneously and the different coercive field might be related to the jumps in the ferromagnetic hysteresis loops. Both the ferroelectric and magnetic properties were shown to correlate with the composition-driven structural evolution.
研究领域:
材料科学
·
物理学
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jingjing Ning,Zihan Kang,Ni Qin,Mengshi Chen,Jiang Wu,Dinghua Bao
The discharge of toxic pollutants and the abuse of antibiotics present significant risks to both global food safety and public health. The utilization of clean mechanical energy for catalytic degradation has been demonstrated as a promising approach to overcome prevalent obstacles. In this work, we employ the approach of manipulating carrier separation through interface engineering to boost the piezocatalytic performance of BiFeO 3 (BFO). Specifically, a Z -scheme heterojunction is established with BFO by utilizing energy band-matching Bi 2 S 3 (BS). In contrast to the pure BFO (1.49 × 10 −2 min −1 ) and BS (1.64 × 10 −2 min −1 ), the BFO/BS heterojunction demonstrates a notable enhancement in piezocatalytic performance, reaching 3.56 × 10 −2 min −1 . This enhancement is believed to be due to the presence of a polarization field facilitating band tilt and the construction of Z -scheme heterojunction. Following the implementation of light assistance, the piezocatalytic efficiency of BFO/BS is enhanced to a greater extent (6.07 × 10 −2 min −1 ), attributing to the enhanced separation of photogenerated carriers facilitated by the piezoelectric polarization field. This study not only demonstrates the potential of BFO/BS as a catalytic candidate material by multimodal renewable energy harvesting, but also offers insights for the strategy of enhancing catalytic activity through interface engineering.
研究领域:
材料科学
·
环境科学
·
催化化学
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Lihui Yang,Wenjian Yang,Shangtao Liang,Zeqin Lin,Jianxin Pan,Cao Yang,Tingting Zhu,Sihao Lv,Hui Lin
Nitrate electroreduction (NO 3 RR) is a promising alternative route for green synthesis of ammonia, where high-efficient catalysts are desired. Herein, an inexpensive ABO 3 -type perovskite BiFeO 3 was demonstrated as a highly efficient NO 3 RR catalyst compared to most of the reported non-precious catalysts. More interestingly, a surface evolution is observed in conjunction with an enhancement in NH 3 yield rate during the NO 3 RR process. Numerous metallic Bi 0 clusters and oxygen vacancies (OVs) are in-situ generated in the reconstructed BiFeO 3 (RS-BiFeO 3 ), and are proposed to be the genuine active sites. Density functional theory calculations suggest the RS-BiFeO 3 promotes the conversion of *NO 2 to *NO and enhances the *H supply for NO 3 - hydrogenation, thus boosting NO 3 RR. The yield rate of NH 3 by the reconstructed BiFeO 3 electrode reaches 5.3 mg cm −2 h −1 with a Faradaic efficiency of 86.8% at −0.7 V vs . RHE, over 4 times higher than that of the pristine BiFeO 3 electrode. This study establishes a fundamental understanding of BiFeO 3 reconstruction during NO 3 RR, and provides insights for the rational design of perovskite NO 3 RR electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 3
·e70683
·
IF 4.2
Yalong Ge,Zusheng Chen,Tian Liang,Ronghua Qin,Haibo Xiao,Shiheng Liang,Ruilong Wang,Lingfang Xu
Electrocaloric cooling offers a more eco-friendly and efficient alternative to conventional vapor-compression refrigeration. Composites, incorporating ceramic nanoparticles within a ferroelectric polymer matrix, exhibit both high dielectric breakdown strength and flexibility. In this study, a sandwich-structured composite film of bismuth ferrite (BiFeO 3 )-filled poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) was prepared using a doctor-blade method. Distinct from terpolymers possessing relaxor ferroelectric properties, the material facilitates a more convenient indirect assessment of its electrocaloric performance. At 100 MV·m − 1 , the polymer composite containing 10 wt% BiFeO 3 achieved a maximum isothermal entropy change ( ΔS ) and an adiabatic temperature change ( ΔT ) of 113.4 kJ·K − 1 ·m − 3 and 17.2 K near the Curie temperature ( T C ) of 383 K. The ΔT of the composites is twice that of pure P(VDF-TrFE) films under the same electric field. These values significantly exceed those reported for P(VDF-TrFE)-based composites. The enhanced polar beta phase in P(VDF-TrFE) phase and enlarged local electric field caused by BiFeO 3 heterogeneous segment in the polymer matrix should both contribute to the outstanding electrocaloric performance. This research broadens the application scope of eco-friendly, flexible electronic materials that maintain stable electrocaloric refrigeration properties under high electric fields.
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高影响因子
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