JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Aditya Jain,Y.G. Wang,N. Wang,Y. Li,F.L. Wang
In order to improve the multiferroic characteristics of BaTiO 3 based composites, diphasic magnetoelectric composites of (1- x )Ba 0.83 Ca 0.10 Sr 0.07 TiO 3 -( x )BaFe 12 O 19 ( x = 0–0.30) were systematically investigated. A cheap and commercially viable modified mechano-chemical activation technique has been used for the synthesis of materials. The dielectric , ferroelectric and piezoelectric characteristics of composites are slightly degraded with substitution, which may be ascribed to non-ferroelectric nature of BaFe 12 O 19 compared to Ba 0.83 Sr 0.07 Ca 0.10 TiO 3 . However, there is a significant improvement in the magnetic properties of the composites. The composites have demonstrated a classical ferrimagnetic behavior, which is mainly attributed to the presence of BaFe 12 O 19 phase. The magnetoelectric response of the composites has also shown a substantial improvement compared to pristine Ba 0.83 Sr 0.07 Ca 0.10 TiO 3 sample, which is non-magnetic in nature and therefore, do not possess any magnetoelectric characteristics. A dielectric constant of 6435 and maximum magnetoelectric constant of 4.79 mV/cm Oe has been obtained for the sample with concentration x = 0.30. The main objective of this work is to design a composite system with improved multiferroic and magnetoelectric properties and therefore, the obtained electrical properties of composites are still appreciable considering a progressive improvement in magnetic properties with BaFe 12 O 19 substitution. A large value of dielectric constant combined with moderate magnetic characteristics of these composites can provide a potential application in related electronic devices.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
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2015
·Vol. 117
·期 8
·
IF 2.183
He Hongcai,Luo Feifei,Qian Neng,Wang Ning
Three-phase composites of poly(vinylidene fluoride)-BaFe 12 O 19 -reduced graphene oxide (PVDF–BFO-RGO) were synthesized by a facile wet chemical method and hot-pressing approach. The phase structure, topography of the hybrid materials were characterized by X-ray diffraction, scanning electron microscopy, and Raman spectra. Influence of RGO on their electromagnetic properties was investigated. Especially, improved microwave absorption and electromagnetic properties of BaFe 12 O 19 –PVDF composites by incorporating RGO were obtained and studied. The PVDF/BFO/RGO sample with m(RGO):m(BFO) = 5:100 shows the best microwave absorption properties with a minimum RL = −32 dB at 11 GHz and with the bandwidth less than −20 dB from 9.6 to 12.8 GHz. The composites were believed to have potential applications as the microwave absorber.
研究领域:
材料科学
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物理学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 30
·期 11
·30197-30209
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IF 5.19
Feng Shan,Xie Taiping,Kong Deshun,Yang Fuling,Li Tao,Yang Junwei,Liu Meixin,Du Haigang,Su Zhimin
Many previous studies have underestimated the role of magnetic components in improving photocatalytic performance. It is significance to explore the migration mechanism of photoinduced carriers in magnetic heterojunction. Here, a magnetic heterojunction, BiOI/BaFe 12 O 19 , was synthesized by a simple preparation method. The optimal synthesis conditions and photocatalytic reaction conditions were explored. The growth mechanism of bismuth iodide oxide (BiOI) was elaborated by introducing a micromagnetic field stemming from barium ferrite (BaFe 12 O 19 ). The electrochemical impedance spectroscopy (EIS), Mott–Schottky curve (MS), transient fluorescence spectrometer (PL), and photocurrent response plot (i ~ t) tests indicated that the BiOI/BaFe 12 O 19 possessed a higher transfer capacity of electrons, higher separation efficiency of photoinduced carriers, stronger photocurrent response, and higher carriers density, compared with pure BiOI. The ultraviolet–visible diffuse reflectance spectrophotometer (UV–vis DRS), electron paramagnetic resonance spectrometer (EPR), MS, and quenching experiments revealed band structure configuration and migration mechanism of photoinduced carriers. The enhancement mechanism of photocatalysis and photocatalytic reaction mechanism was clearly proclaimed in BiOI/BaFe 12 O 19 catalytic system. Graphical Abstract
研究领域:
材料科学
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化学
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光催化
·
磁学
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产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
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2013
·Vol. 34
·期 11
·1801-1808
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IF 1.482
Jie Zhao,Yu Xie,Zhanggao Le,Yan Luo,Yunhua Gao,Rong Zhong,Yuancheng Qin,Jianfei Pan,Yan Huang
The BaFe 12 O 19 /multiwall carbon nanotubes/poly(3-methyl-thiophene) (BaFe 12 O 19 /MCNTs/P(3MT)) composites were synthesized through an in situ chemical polymerization of 3-methyl-thiophene (3MT) in the presence of BaFe 12 O 19 /MCNTs composite powders. The BaFe 12 O 19 /MCNTs/P(3MT) composites were characterized by the fourier transform infrared spectrometry (FTIR) and X-ray diffraction (XRD). The morphologies of the composites were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electric conductive properties were tested by a four-probe conductivity tester and the magnetic properties were measured by vibrating sample magnetometer (VSM). The electromagnetic performance tests showed that when the mass ratio of BaFe 12 O 19 to MCNTs was 0.4, and the BaFe 12 O 19 /MCNTs to P(3MT) was 0.15, the conductivity, saturation magnetization ( M s ) and residual magnetization ( M r ) of the BaFe 12 O 19 /MCNTs/P(3MT) composites achieved 166.740 S/m, 29.884 emu/g, and 17.581 emu/g, respectively. POLYM. COMPOS., 34:1801–1808, 2013. © 2013 Society of Plastics Engineers
研究领域:
材料科学
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电磁材料
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聚合物复合材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xue Li,Guo-Long Tan
Coexistence of ferroelectricity and ferromagnetism in one single phase of a solid is of great interest because of the potential application for novel electronic devices. We report on the enhanced ferroelectricity jointly co-existing with excellent magnetic performance in M-type barium hexaferrite (BaFe 12 O 19 ), which demonstrating a classic electric polarization (P-E) hysteresis loop with full saturation. Two nonlinear current peaks in the I–V curve for polarization switch and giant abnormal change of dielectric constant near Curie temperatures provide sufficient experimental evidences to verify the ferroelectricity of BaFe 12 O 19 ceramics. It holds a large remnant polarization of 55.7 μC/cm 2 and a suitable coercive field at 441 kV/cm. Two peaks at 194 °C and 451 °C in the temperature-dependent dielectric spectrum of BaFe 12 O 19 ceramics are considered to be the phase transition from ferro-to antiferro- and antiferro-to para-electric structures. A conventional strong magnetic hysteresis loop was also observed. The influence of oxygen vacancies on the band structure, electric and magnetic properties has been discussed in detail. The magnetically induced E-polarization upon the BaFe 12 O 19 ceramics was achieved in the form of alternating spin current waves. These combined multiple functional responses of large ferroelectrics and strong ferromagnetism reveal the excellent multiferroic features of BaFe 12 O 19 , which would bring forth the great opportunity to create novel electric devices with active coupling effect between magnetic and electric orders.
研究领域:
凝聚态物理
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功能材料
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磁学
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铁电学
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电子陶瓷
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多场耦合材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Jie Wang,Gang Chen,Xue Bai,Chao Chen,Zixuan Zhang,Zhengtang Su,Zhijun Zhou,Fei Chen,Yilong Ma,Wei Cai,Rongli Gao,Chunlin Fu
To further study the microwave absorbing properties of hexagonal barium ferrites (abbreviated as BaM) fabricated by using an innovative hydrothermal method with different mineralizers, the crystal structure, morphology, magnetoelectric and the microwave absorption properties of BaM were systematically studied. X-ray diffraction patterns (XRD) show that all samples exhibit a pure phase for BaM. At the same time, the grain size and morphology can be controlled and the thicker and regular hexagonal flakes were obtained using KOH mineralizer. The maximal magnetization in the field 15 kOe of BaM can be improved by using KOH mineralizer compared to NaOH mineralizer, while the coercivity ( H c ) is slightly reduced. The maximal magnetization in the field 15 kOe is 31.83 emu/g and 43.36 emu/g for BaM synthesized with NaOH and KOH mineralizers, and the H c is 860.23 Oe and 842.00 Oe, respectively. Meanwhile, the RL values of BaM synthesized with NaOH mineralizer are greater than − 3.00 dB indicating poor absorbing property. While, as for the BaM synthesized with KOH mineralizer, the electromagnetic wave absorption performance is enhanced greatly. The minimum value of the reflection loss ( RL min ) is − 17.59 dB obtained at 13.2 GHz with a thickness of 1.5 mm, and the effective absorption bandwidth is up to 3.2 GHz (11.6∼14.8 GHz) for BaM with KOH mineralizer. This work provides a kind of effective method to enhance the microwave absorption properties of BaM material by changing the mineralizer, and suggests that BaM is a microwave absorbing material with great potential engineering applications for 5 G communication.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2023
·
IF 4.6
Chao Chen,Gang Chen,Fei Chen,Zixuan Zhang,Jie Wang,Zhengtang Su,Zhijun Zhou,Yilong Ma,Wei Cai,Rongli Gao
Combining magnetic and dielectric materials to form a composite can significantly improve its impedance matching and electromagnetic wave absorption performance. Furthermore, composite materials with a core–shell structure hold promise in meeting the demand for lightweight and highly electromagnetic-absorbing properties. In this study, uniform hexagonal flake barium ferrite (BaFe12O19) was prepared using the hydrothermal method. Subsequently, BaFe12O19@PVDF composites were synthesized by the sol–gel method. By adjusting the mass ratio of BaFe12O19 and PVDF, the shell size of the BaFe12O19@PVDF composite material was controlled, and its electromagnetic absorption performance was enhanced. The shell thickness of BaFe12O19@PVDF is 19.64 nm when the BaFe12O19: PVDF mass ratio is 1:1.0, and the optimal impedance matching is obtained at 13.4 GHz. Meanwhile, at a thickness of 1.5 mm, the minimum reflection loss (RLmin) reached −58.04 dB, and an effective absorption bandwidth (EAB) (RL ≤ −10 dB) of 5.53 GHz was achieved within the frequency range of 11.65 to 15.63 GHz and from 16.36 to 17.91 GHz. Besides, the composites with a matching thickness of 3.5 mm show a maximum EAB of 15.90 GHz when the mass ratio of BaFe12O19 to PVDF is 1:1.2. Within the frequency range of 2–18 GHz, the coverage of reflection loss less than −10 dB is 99.38%, almost achieving full coverage. These results demonstrate that BaFe12O19@PVDF composites exhibit excellent electromagnetic-absorbing performances, making them an excellent candidate for electromagnetic wave absorption in 5G communications.
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2026
·
IF 6
Tonglu Huang,Man Wang,Xiaolei Nie,Wanting Zhu,Yu Zhang,Mingrui Liu,Wenyu Zhao
High-performance infrared (IR) radiative materials are important for energy conservation and electronic thermal management, yet effective strategies for simultaneously enhancing short- and long-wave IR emissivity remain limited. Herein, Sr-substituted barium hexaferrite (Ba 1− x Sr x Fe 12 O 19 , x = 0, 0.1, 0.3, and 0.5) powders were synthesized via chemical co-precipitation, and the effects of Sr substitution on the crystal structure, optical properties, and IR radiative performance were systematically investigated. Sr substitution at Ba sites induced lattice contraction and modified the local structural environment. The apparent optical bandgap decreased from 3.59 eV for BaFe 12 O 19 to 2.92 eV for Ba 0.7 Sr 0.3 Fe 12 O 19 . In the 2.5–5 μm band, Ba 0.7 Sr 0.3 Fe 12 O 19 exhibited an average emissivity of 0.62, corresponding to a 72.2% increase relative to BaFe 12 O 19 , which is associated with the reduced apparent optical bandgap and modified surface Fe/O chemical states detected by XPS. In the 8–14 μm band, the enhanced emissivity is mainly attributed to lattice-distortion-induced changes in the vibrational response, and Ba 0.7 Sr 0.3 Fe 12 O 19 exhibited an average emissivity of 0.90, representing a 3.4% increase over BaFe 12 O 19 . In the 2.5–15 μm range, its average emissivity reached 0.80, which is 63.3% higher than that of BaFe 12 O 19 . Furthermore, the Ba 0.7 Sr 0.3 Fe 12 O 19 /PVDF composite coating achieved a 6.5 °C reduction relative to a bare Cu plate and a 3.8 °C reduction relative to a pure PVDF coating. This work provides a low-cost and scalable strategy for improving the IR radiative performance of BaFe 12 O 19 -based materials through cation substitution and structural regulation, offering a promising route for thermal management in next-generation electronic devices.
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高影响因子
ACS Applied Electronic Materials
·
2026
·Vol. 8
·期 17
·7601-7616
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IF 4.7
Yao Zhiqian,Zhong Wei,Wei Haoshan,Zhang Jie,Zhang Yong,Zhang Xueru,Cui Jiewu,Wang Yan,Liu Jiaqin,Wu Yucheng
With the rapid advancement and widespread adoption of millimeter-wave technology, developing high-performance microwave-absorbing materials has become critical for addressing electromagnetic interference and radiation pollution. To meet electromagnetic compatibility requirements in the 18−40 GHz frequency range, this study proposes a Nb 5+ -Mn 2+ cosubstitution strategy and fabricates Ba(NbMn) x Fe 12-2x O 19 absorbers via a sol-gel method. The results show that increasing the substitution ratio (X) modifies ion occupation, shifting the absorbers’ natural resonance frequency to the 21 GHz and 35 GHz atmospheric windows while broadening the microwave absorption bandwidth. Specifically, when X = 0.3, the absorber achieves an absorption peak of −43.37 dB in the K-band with an effective absorption bandwidth (EAB) of 6.46 GHz. When X = 0.2, it exhibits a superior absorption peak of −54.51 dB in the Ka-band, accompanied by an ultrabroad EAB of 12.87 GHz. The mechanism analysis reveals that Nb 5+ -Mn 2+ cosubstitution constructs a synergistic magnetoelectric loss system: it enhances magnetic loss, triggers multidielectric polarization, and optimizes impedance matching which collectively enables excellent broadband microwave absorption through magnetoelectric synergy. This work provides a viable strategy for designing high-frequency microwave absorbers and highlights the significant potential of Nb 5+ -Mn 2+ cosubstituted M-type barium ferrites in electromagnetic wave absorption applications.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Pengyu Li,Xiaohua Feng,Xiangkui Liao,Shihan Sheng,Axin Huang,Yi Liu,Hua Li
Developing efficient microwave-absorbing coatings via thermal spraying is usually hindered by the thermal demagnetization and oxidation of fillers. Herein, a low-temperature flame spraying strategy is proposed to fabricate Nd-doped BaFe 12 O 19 /nano-carbon spheres (CS)/polyimide (PI) coatings. By systematically controlling the feed rate of the starting feedstock, we precisely modulate filler dispersion and coating microstructure evolution, thereby inducing significant transitions in the dominant microwave attenuation mechanisms. At high feed rates, limited CS addition promotes localized surface plasmon resonance (LSPR) and metallization effects within the surface-dense layer, while excessive CS loading induces an overconnected network and prominent skin effect, impairing microwave absorption (MA) in both cases. Conversely, under low feed rates, favorable thermodynamic and kinetic conditions enable the formation of PI-encapsulated spherical filler structures in the surface region. This unique structure effectively suppresses LSPR and the skin effect, enhances polarization losses, prevents excessive conductivity rise (mitigating impedance mismatch), and thus optimizes over MA. Consequently, the high-feed-rate coating delivers a minimum reflection loss ( RL min ) of−39.1 dB and an effective absorption bandwidth ( EAB ) of 3.7 GHz at a thickness of 4.3 mm. In contrast, the coating with PI-encapsulated spherical filler structures achieves a better RL min of −52.3 dB and a wider EAB of 6.1 GHz at 2.1 mm. Furthermore, the coatings demonstrate outstanding adhesion, achieving Class 0 in the cross-cut testing. Scratch testing demonstrates excellent cohesion and interfacial robustness without catastrophic delamination. The results would give critical mechanistic insight into establishing scalable technical route for engineering flame-sprayed microwave absorbers with simultaneously enhanced structure-function integration and long-lasting mechanical performance.
研究领域:
材料科学
·
微波吸波材料
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热喷涂技术
·
电磁功能涂层
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2026
·
IF 5.7
Zhen He,Yu Hu,Miao Li,Xiaohu Ren,Yun Tang,Hongfeng Yin,Hudie Yuan,Yuchi Liu
Anisotropic TOCNF/rGO/BaFe 12 O 19 aerogels were fabricated via a simple FESTA strategy. • The anisotropic porous architecture promotes multiple reflection and scattering of EMWs. • BaFe 12 O 19 introduction enables synergistic dielectric-magnetic loss mechanisms. • A minimum reflection loss of −62.19 dB and a bandwidth of 8.91 GHz were achieved. • CST simulations confirm the excellent EMW attenuation capability. Leveraging its ultralight weight and well-developed porous structure, three-dimensional graphene aerogel demonstrates exceptional application value in electromagnetic wave absorption. Nevertheless, achieving synergistically enhanced absorption performance through simultaneous structural engineering and multi-loss mechanism integration remains a formidable challenge for lightweight graphene-based aerogels. In this work, anisotropic TOCNF/rGO/BaFe 12 O 19 aerogels were fabricated via a freezing-ethanol solvent exchange thawing and ambient drying (FESTA) strategy. By incorporating BaFe 12 O 19 , the cooperative enhancement of dielectric and magnetic losses was achieved, while the unique porous architecture promoted successive reflections and scattering of incident electromagnetic waves (EMWs) within the aerogel, thereby facilitating electromagnetic energy dissipation. With the rGO/BaFe 12 O 19 mass ratio adjusted to 1:1, the resulting aerogel achieved an RL min of −62.19 dB and an EAB of 8.91 GHz. The superior EMW absorption performance stems from the enhanced polarization and magnetic losses. Radar cross-section (RCS) analyses moreover reveal that the aerogel possesses favorable electromagnetic wave scattering suppression performance under realistic conditions. Therefore, this study offers a viable approach for realizing electromagnetic absorbing materials integrating light weight, broad bandwidth, and excellent performance. Download: Download high-res image (354KB) Download: Download full-size image
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高影响因子
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