JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Pingyuan Meng,Kun Xiong,Lin Wang,Shengnan Li,Yankui Cheng,Guangliang Xu
In order to achieve a broader absorption bandwidth with smaller reflection loss (RL) in electromagnetic absorber, nickel ions (Ni 2+ ) were employed to partially occupy the sites of cobalt ions (Co 2+ ) in BaCoTiFe 10 O 19 . Ni-doped barium hexaferrite (BaNi x Co 1 − x TiFe 10 O 19 ) powders were synthesized via the sol–gel combustion method. Subsequently, the microwave absorbing composites were prepared by mixing the BaNi x Co 1 − x TiFe 10 O 19 powders with the paraffin. As the doped Ni 2+ ions were in augment, the grain size of BaNi x Co 1 − x TiFe 10 O 19 decreased from 400 nm to 50 nm. Based on the electromagnetic parameters measured by the vector net-analyzer in the frequency of 0.5–18 GHz, it was found that the peaks of the complex permeability shifted to the high frequency region with the increase of the doped Ni. Moreover, the composite ( x = 0.4) possessed a maximum reflection loss (RL) of −47.49 dB at 13.28 GHz with a matching thickness of 2.0 mm. It also had a bandwidth below −20 dB ranging from 12.36 GHz to 18 GHz, which has great potentials applications in the high frequency fields of the microwave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Xiaocheng Hu,Zipeng Liang,Qiyang Li,Sideng Hu,Shaoxing Qu
The magnetic permeability of three kinds of inclusions (Carbonyl iron, Ferroferric oxide, NiFe-alloy) filled polymer (Polydimethylsiloxane) is investigated at room temperature by using a Buck circuit for the dynamic test and vibrating sample magnetometer (VSM) for the static test. Unlike the traditional measurement method using an impedance analyzer, the self-built circuit can generate a maximum test current of ampere amplitude over high frequencies to simulate the transformer's operation status. The present work considers the effects of inclusion content (from 0 VOL.% to 33 VOL.%) and testing frequencies(100 kHz-1MHz). The experimental results of permeability are compared with the theoretical predictions in the previous works. Three main conclusions can be drawn: First, the magnetic permeability increases with the inclusion addition; Second, as the testing frequency increases, the permeability of the composite material maintains constant, showing no evident dependence on the testing frequency; Third, type of magnetic inclusion will gently affect the permeability of the composite material. This work systematically investigated the permeability of polymer-based magnetic materials, and the results are helpful for the soft-core transformer application of magnetoactive elastomers.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Danhua Liu,Xin Liu,Jian Wang,Xinhua Mao,Xiaochang Xu,Xi’an Fan
The effect of Fe nanoparticles with mass fraction of 0-7 wt% on the microstructure and soft magnetic properties of the Fe-6.5 wt%Si soft magnetic composites (SMCs) was investigated. The results show that the pores between Fe-6.5 wt%Si powders can be effectively filled by Fe nanoparticles , thereby correspondingly increasing the density of the SMCs. At the same time, the magnetic permeability of the SMCs mixed with different mass fraction of Fe nanoparticles has improved significantly and exhibits good frequency stability compared with the absence of Fe nanoparticles. It also reveals that the addition of 1 wt% Fe nanoparticles can reduce the eddy current loss of the SMCs by decreasing its intra-particle eddy current loss. When the addition of Fe nanoparticles is 3 wt%, the SMCs exhibits good magnetic properties with high magnetic permeability (increased by 24%) and relatively low core loss.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4812-4818
·
IF 1.938
Li Wangchang,Wang Chun,Ying Yao,Yu Jing,Zheng Jingwu,Qiao Liang,Li Juan,Che Shenglei
Soft magnetic composites (SMC) with a bionic shell structure and a delicate, regular layered arrangement were prepared via a casting process. The permeability of composite samples was 140 at 5 MHz for plane anisotropy, while that of the spherical-particle-constructed material is only 14. According to classical loss separation results, the layered bulk material without an SiO 2 coating exhibited lower hysteresis loss. In contrast, the layered bulk material coated with SiO 2 showed lower eddy current loss, attributed to the increase in resistivity resulting from the SiO 2 coating. The magnetic loss of the layered bulk materials was 588 kW/m 3 at 50 mT and 100 kHz. SMC materials with this structure are anticipated to have strong potential for magnetic cores used in high-efficiency power supplies.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhihui Xu,Jing Li,Xiaoling Peng,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
In this study, nano-sized La-doped YIG (Y 3-x La x Fe 5 O 12 , x = 0.00, 0.03, 0.05, 0.08, 0.10, and 0.15) were prepared using a reverse co-precipitation method, which were then combined with FeSiCr powder to create a novel FeSiCr/Y 3-x La x Fe 5 O 12 soft magnetic composite (SMC). X-ray Diffraction (XRD) analysis confirmed the successful incorporation of La into the YIG lattice. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) scans demonstrated that a uniform insulating layer of La-doped YIG was effectively coated on the FeSiCr particles. The results revealed that the Y 2.92 La 0.08 Fe 5 O 12 powders showed the highest M s of 22.334 emu/g. Furthermore, the FeSiCr/Y 3-x La x Fe 5 O 12 SMCs exhibited notable improvements both in permeability and core loss with a La doping concentration of x = 0.08 ( P cv = 122.35 mW/cm 3 , μ e = 51.034 at 10 mT and 500 kHz), accompanied by an enhancement of DC bias characteristics. This work optimized the magnetic properties of YIG with La doping and constructed a novel FeSiCr/La-doped YIG SMCs with enhanced high-frequency performance.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2022
·
IF 3.097
Qingrong Lv,Shoujin Zhu,Xingli Zhao,Xiansong Liu,Shuangjiu Feng,Xucai Kan,Yang Yujie,Yuan Cheng
A composite material with a nominal composition of Ni 0.6 Fe 2.4 O 4 was prepared by the solid-phase reaction method. X-ray diffraction analysis shows that the product is composed of α-Fe 2 O 3 and a solid solution of Fe 3 O 4 and NiFe 2 O 4 . Although α-Fe 2 O 3 non-magnetic phase reduces the saturation magnetization, it greatly improves the temperature and frequency stability of magnetic permeability. Based on the measurement results of the amplitude permeability in the range of −60 °C to 100 °C, the temperature coefficient α μ and specific temperature coefficient β were calculated. α μ and β of the composite material are 7.15 × 10 - 5 / ° C and 8.6 × 10 - 6 / ° C , respectively, which are much smaller than α μ (1.26 × 10 - 3 / ° C ) and β (9.5 × 10 - 5 / ° C ) of NiFe 2 O 4 . At the same time, the magnetic spectrum curves show that the real part of the complex permeability μ ' basically remains unchanged within the measurement frequency range ( f < 10 6 Hz). This improvement in temperature and frequency stability is attributed to the effect of the α-Fe 2 O 3 phase.
研究领域:
材料科学
·
磁学
·
复合材料
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 5
·2125-2133
·
IF 3.502
Naichao Chen,Bin Xiao,Xinwei Xu,Tao Sun,Fei Jin,Meiyu Chen,Xianqiang Chen,Hong Wang
(1- x )Na 2 WO 4 – x Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 (NWO-NCZO) ceramic composites ( x = 0–0.6) were successfully prepared by the cold sintering method under a uniaxial pressure of 200 MPa at 150°C for 30 min. The microstructures and electromagnetic properties of (1- x )NWO- x NCZO ceramic composites with different NCZO contents have been systematically investigated. The obtained biphasic NWO-NCZO ceramic composites possess dense microstructures. The 0.4NWO–0.6NCZO ceramic composite exhibits a matched relative permittivity and relative permeability of around 8 in the frequency range from 10 to 200 MHz, which is beneficial for impedance matching between antenna and free space. A prototype of microstrip antenna based on the developed NWO-NCZO ceramic composite is designed and to demonstrate its application in miniaturized antennas. The simulation results revealed that the size of the radiation patch of the antenna can be reduced by 60% yet with bandwidth being enhanced 26.5 times when the 0.4NWO–0.6NCZO ceramic composite is selected as the substrate instead of pure NWO ceramic.
研究领域:
材料科学
·
电磁工程
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Fei Xie,Yang Chen,Minyu Bai,Pinglu Wang
In the present work, a Co-substituted LiZnTiBi (Li 0.43 Zn 0.27 Co x Ti 0.13 Fe 2.167-x Bi 0.003 O 4 ) ferrite with equivalent permeability and permittivity was prepared by a low-temperature sintering method. In detail, the LiZnTiBi ferrite with high permeability was obtained by a solid phase method. Next, different mass of Co 2 O 3 (x = 0.100, 0.125, 0.150, 0.175 and 0.200) were added to reduce permeability ( μ r ’ ) and enhance cut-off frequency ( f r ) of the ferrite. Results indicated that the Co-substituted LiZnTiBi ferrite with equivalent permeability and permittivity ( μ r ’ = ε r ’ = ∼12.3) was obtained when additive amount of Co 2 O 3 (x) is around 0.150. Meanwhile, the cut-off frequency ( f r ) of the ferrite is more than 500 MHz. Also, the influences of Co 2 O 3 additive on the microstructure and phase structure of the LiZnTiBi ferrite have been investigated and discussed. SEM images indicated that the Co-substituted LiZnTiBi ferrites possess uniform and compact grains (average grain size is ∼1 μm). XRD patterns demonstrated that the LiZnTiBi ferrite material has a pure spinel structure. Rietveld refinement of XRD proved that Fe 3+ is substituted by Co 3+ . And energy dispersive spectrometer (EDS) result indicated that the Co element is existed in ferrite grains. Such a low-temperature sintering ferrite substrate material with equivalent permeability and permittivity at high frequency (@500 MHz) should also be an alternative material for microwave devices, especially for miniature antenna.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Huaqin Huang,Jian Wang,Zhenghao Cui,Zihan Gao,Zhenyi Huang,Zhaoyang Wu
This study introduces an approach to fabricating soft magnetic composites (SMCs) that effectively address core loss while maintaining high magnetic conductivity. During the sintering process in a water vapor environment, the CeO 2 insulation layer facilitates the selective oxidation of Si while simultaneously impeding the outward diffusion of Fe and Cr. Consequently, a CeO 2 ·SiO 2 composite insulation layer forms within the FeSiCr-based SMCs. The FeSiCr-based SMCs with the CeO 2 ·SiO 2 composite insulation layer achieve a saturation magnetization of 153.1 emu/g, which is 10.9% lower than that of FeSi 3.7 Cr 4.5 compacts, and exhibits a deterioration rate lower than previously reported values. Moreover, the permeability of the FeSiCr-based SMCs remains highly stable, demonstrating outstanding insulation characteristics. The total core loss and core loss separation results further corroborate that incorporating a CeO 2 ·SiO 2 composite insulation layer leads to a more pronounced reduction in interparticle eddy current loss than using a CeO 2 insulating layer alone. This performance enhancement can be attributed to the selective oxidation of a rare metal oxide insulation layer on a ferromagnetic metal particle substrate, a technique applied to SMCs for the first time. These findings hold significant implications for the design of high-performance SMCs in miniaturized and lightweight electromagnetic devices.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
·
2021
·Vol. 129
·期 9
·566-573
·
IF 1.224
Xuehai ZHOU,Ke ZHOU,Tianchi ZHANG,Lining FAN,Hongbo ZHANG,Hui ZHENG
The regulation of magnetic and dielectric properties for hexagonal barium ferrites by ion doping is highly desirable in magnetic recording and microwave absorption. Herein, aluminum (Al)-substituted barium hexaferrite with the general formula of BaFe12−xAlxO19 (x: 0, 0.6, 1,2, 1.8) was obtained. The influences of the Al3+ doping concentration on the crystal structure, microstructure, static magnetic, complex dielectric and permeability properties of hexagonal barium ferrites were studied. The morphologies and crystal structure characterizations confirm the Al3+ ion has effective doping in the hexagonal barium ferrites and substituted for Fe3+ in positions of 2b site. The lattice parameters and grain size of the hexagonal barium ferrites were dependent on the doping concentration. The magnetic characterization displays the saturation magnetization decrease while the coercivity increase with the doping concentration. The high-value about 8249 Oe of coercivity can be obtained at x = 1.8. The dielectric properties measurement further indicates that Al doping could improve both real and imaginary parts of permittivity. The highest value of the real part of permittivity was obtained at x = 1.2. Lastly, the complex permeability spectrum displayed the doping of Al ions not only regulate the complex permeability but also influence the domain wall resonance frequency, which is significant for controlling the application frequency.
研究领域:
材料科学
·
磁性材料
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Guibing Shi,Jin’ao Zang,Rujian Chen,Xianrui Wang,Li Wang,Mingxu Wang,Yun Cheng
Organic and inorganic composite coating layers have attracted significant attention because of their excellent insulating properties. In this study, nano-oxide/epoxy resin composite coating layers were prepared in FeSiBCuNb/FeSi soft magnetic composites (SMCs). And the influence of Al 2 O 3 , CeO 2 , SiO 2 and Fe 3 O 4 nano-oxides on the properties of SMCs is analyzed in detail. The density and phase structure of nano-oxides result in differences in their modifiable and agglomerative properties, affecting the insulation coating layers on the surface of magnetic particles. This is refilected as a change in magnetic properties on a macroscopic scale. Analysis results show that the introduction of nano-Al 2 O 3 significantly decreases the effective permeability of SMCs. However, it exhibits excellent loss characteristics in the high-frequency field of 5 MHz. The introduction of nano-CeO 2 optimizes the losses and effective permeability of SMCs at 1 MHz. And the losses and effective permeability of SMCs are 591.4 mW/cm 3 (20mT, 1 MHz) and 35.5 (1 MHz), respectively. This work provides a reference for selecting nano-oxides in the insulation coating layers of SMCs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-10
·
IF 2.8
Gao Lingxiang,Zhang Hao,Liu Wen,Zhang Shulong,Xie Zunyuan
In this study, electro and magneto dual response of TiO 2 @Fe 3 O 4 composite nanoparticles is realized by situ-generating Fe 3 O 4 , which was synthesized by FeCl 3 and FeSO 4 , on rose-like TiO 2 pore in virtue of facile hydrothermal reaction. Morphology, structure and physical properties, such as dielectric constant and magnetic conductivity, of the TiO 2 @Fe 3 O 4 composite particles were characterized. The particles were dispersed in hydrous elastomer to measure their electro and magneto responsive property by the scanning electron microscopy of micro structure of hydrous elastomer and dynamic mechanical analysis that reflected by the sensitivity of the increase in storage modulus ( f = ∆ G / G ) of the hydrous elastomer cured in the absence/presence of external field. The one of the TiO 2 @Fe 3 O 4 particles consisting of the ratio of TiO 2 :Fe 3 O 4 to 2:1 has the highest electro and magneto dual responsive effect that reaches 62%, which is far higher than TiO 2 with only 15%. This work provides a new substance shows the excellent performance of electro and magneto dual response to applied in smart material field.
研究领域:
材料科学
·
纳米技术
✓ 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）