JOURNAL OF LOW TEMPERATURE PHYSICS
·
2022
·Vol. 209
·期 1
·166-181
·
IF 1.618
Shen JiYu,Mo JiaJun,Tao YuChen,Xia YanFang,Liu Min
The study of spinel ferrite ion sites is an important aspect to optimize its structure. In this report, homogeneous and stable mixed spinels CoFe 2 O 4 and MgFe 2 O 4 were synthesized by a simple sol–gel combustion method. The Curie temperature is higher than 400 K, so the Mössbauer spectrum at room temperature shows a typical magnetically ordered Zeeman sextet. The change in the hyperfine magnetic field is consistent with the change in the saturation magnetization, which can be explained by the change in the superexchange contribution between each point. The frozen magnetic moment at low temperature makes CoFe 2 O 4 appear partly independent of antiferromagnetic domain contribution. The competitive ability of the ion to the B site is Mg 2+ > Co 2+ > Fe 3+ , which will provide some guidance for the structural optimization of spinel ferrite.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Pingan Tan,Xiaoyan Zhong,Jingsong Liu,Fei Yang,Chong Xian,Honglan Yuan
Ni 0.6 Zn 0.4 Fe 2 O 4 (NZF-Zn 0.4 ) ferrites with different Al–Si–B–Pb (ASBP) glass additions were synthesized via a solid-phase reaction method at 1175 °C. The inclusion of ASBP-glass significantly enhances the grain size, density, shrinkage, and magnetic properties of NZF-Zn 0.4 ferrites without introducing impurity phases. The prepared NZF-Zn 0.4 -1 wt%ASBP ferrites not only exhibit appropriate radial shrinkage but also possess a dense microstructure and outstanding magnetic properties. Subsequently, Y 2.4 Bi 0.5 Al 0.1 Fe 3 O 4 (YIG-Al 0.1 ) ferrites and NZF-Zn 0.4 -1 wt%ASBP ferrites were chosen as the outer rings and inner cores, respectively. Tightly interconnected YIG-Al 0.1 /NZF-Zn 0.4 –1wt.% ASBP ferrite composite substrates were successfully co-fired within the temperature range of 1175 °C–1225 °C following co-pressing. Furthermore, YIG-Al 0.1 /NZF-Zn 0.4 -1 wt%ASBP composite substrates, co-fired at 1175 °C, exhibit a lack of impurity phases in the interface region, minimal element diffusion, and exceptional electromagnetic properties (NZF-Zn 0.4 -1 wt%ASBP: M s = 81.88 ± 0.05 emu/g; YIG-Al 0.1 : ε r = 18.28 ± 0.05@11.17 GHz, tanδ = 3.14 ± 0.55 × 10 −4 , M s = 21.62 ± 0.55 emu/g). The wide co-firing temperature range of YIG-Al 0.1 /NZF-Zn 0.4 -1 wt%ASBP composite substrates significantly enhances the shrinkage matching rate of two-phase ferrites, and its exceptional electromagnetic properties hold significant potential for applications in RF band circulators.
研究领域:
材料科学
·
磁性材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 28
·10513-10531
·
IF 5.7
Xiaoqiang Xiong,Xiaodong Jing,Zitao Chen,Qianqian Zhao,Zuoguang Li,Xi Yang,Qun Wang,Tongyun Zhao,Huayang Gong
Using single loss type media as microwave absorbers to simultaneously achieve low reflection loss, wide-band absorption and thin thickness is a huge challenge. In this work, to combine the high dielectric loss of Pr-doped M-type strontium ferrite and the high magnetic loss of W-type hexaferrites, we improved the traditional sol–gel auto-combustion method via increasing an extra sintering process and successfully prepared xSrPr0.5Fe11.5O19/yBaCo2Pr0.5Fe15.5O27 (x : y = 2 : 1, 1.5 : 1, 1 : 1, 1 : 1.5 and 1 : 2) M/W (M-type hexaferrite/W-type hexaferrite) composite materials with a unique “inlay structure”. The M-phase and PrFeO3-type phase were partially wrapped by the huge W-phase, which resulted in enhanced exchange coupling. Benefitting from the exchange coupling and huge grains, the coercivity and anisotropy fields of composite hexaferrites decreased. Therefore, the natural resonance frequencies of some samples reduced to within 18.00 GHz. High magnetic loss occurs while dielectric loss is preserved due to strong resonance interaction and multiple polarization relaxation mechanisms. Hence, the composite hexaferrites exhibit satisfactory microwave absorption performance on account of the magnetic–dielectric synergistic effect. The effective absorption bandwidth of the prepared materials can cover X and Ku bands at thin matching thicknesses (<2.00 mm). The minimum reflection loss reaches −56.30 dB (d = 1.97 mm), and the maximum effective absorption bandwidth reaches 8.17 GHz (d = 1.63 mm). This work will provide new ideas for improving the absorption performance of ferrite composite materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 43
·e09037
·
IF 26.8
Yanchang Zhou,Ruiqing Cheng,Shuyang Yuan,Xiaoqiang Feng,Yushan Zhu,Sheng Jiang,Hao Wang,Lei Yin,Yao Wen,Wei Liu,Jun He
2D magnetic materials offer significant potential for advanced spintronics, but their practical implementation is hindered by fundamental limitations such as low Curie temperatures and the current inability to achieve scalable, large-area synthesis. Herein, a significant breakthrough in the centimeter-scale epitaxial growth of ultrathin single-crystalline magnetic ferrite films, including cobalt ferrite, manganese ferrite, and nickel ferrite is reported. By leveraging symmetry-matching-induced energy splitting between antiparallel orientations and developing a precisely engineered nucleation timing strategy to amplify synergistic coupling, unidirectional epitaxial growth with seamless domain coalescence is achieved. Comprehensive macro- and micro-characterizations confirmed the single-crystalline nature and high quality. Vibrating sample magnetometry measurements reveal robust ferrimagnetism persisting up to 730 K, while magneto-optical Kerr effect microscopy visualized sharp uniform single-domain switching behavior. Interestingly, two potential strategies have been explored for heteroepitaxial integration of CFO thin films with engineered substrates. This work establishes a scalable and viable synthesis route for 2D magnetic oxides, marking a pivotal step toward their practical deployment in high-performance spintronic and quantum devices.
研究领域:
材料科学
·
凝聚态物理
·
自旋电子学
·
纳米技术
·
薄膜生长
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Fangbiao Zhao,Yongcun Zou,Xueju Lv,Hongwei Liang,Qiong Jia,Weikun Ning
Magnetic cobalt ferrite (CoFe2O4)-coated zeolite was prepared with a hydrothermal method and used for the adsorption of gallium and indium. The magnetic zeolite was characterized with X-ray diffraction, X-ray photoelectric spectroscopy, Fourier-transformed infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy to determine its crystal structure, element valence, chemical bond, morphology, and grain size, respectively. Gallium and indium were determined with graphite furnace atomic absorption spectrometry. Effects of experimental parameters, including solution pH and adsorption time, were discussed. The experimental data were studied by employing various isotherm and kinetic models, such as Langmuir/Freundlich and pseudo-first-order/pseudo-second-order models. Furthermore, thermodynamic functions, such as changes of enthalpy (ΔHo), entropy (ΔSo), and Gibbs energy (ΔGo), were obtained.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 7
·1140
·
IF 2.7
Jiuyuan Han,Mengjiao Chi,Liu Yang,Bing Liu,Minmin Mao,Hadi Barzegar Bafrooei,Zhongyan Ma,Yingjie Ren,Feng Shi,Ehsan Taheri-Nassaj,Dawei Wang,Kaixin Song
In this study, dense composites of xNaCl-(1−x)Ni0.5Zn0.5Fe2O4(referred to as NaCl-NZO) and xH3BO3-(0.8−x)Ni0.5Zn0.5Fe2O4-0.2NaCl (referred to as HB-NZO-NaCl) were prepared using the cold sintering process. The objective was to investigate the cold sintering procedure for fabricating ferrite composite ceramics with comparable permeability and dielectric constants suitable for radio-frequency electronic device applications. Optimal cold sintering conditions were determined as 200 °C/30 min/500 MPa with a relative density of 95% for NaCl-NZO and 120 °C/30 min/300 MPa with a relative density of 95.4% for HB-NZO-NaCl. X-ray diffraction and scanning electron microscope analyses confirmed the absence of secondary phases. The resulting composite ceramics showed promising characteristics, with the 0.5NaCl-0.5NZO composition exhibiting a dielectric constant of 6.2 @ 100 MHz, dielectric loss of 0.02 @ 100 MHz, permeability of 2.5 @ 100 MHz, and magnetic loss of 0.001 @ 100 MHz. Similarly, the 0.3HB-0.5NZO-0.2NaCl composition displayed a dielectric constant of 5.9 @ 100 MHz, dielectric loss of 0.02 @ 100 MHz, permeability of 5.1 @ 100 MHz, and magnetic loss of 5 × 10−4@ 100 MHz. These findings indicate potential applications in wireless communication.Keywords:cold sintering;magnetic–dielectric materials;ferrite;dielectric constant
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2024
·
IF 1.6
Pi Siwen,Li Jie,Zhang Yingde,Zhou Weina,Shan Shuo,Zhao Xuan
Ce-substituted M-type Sr 1– x Ce x Fe 12 O 19 ( x = 0.00–0.08) ferrites were successfully synthesized via the ball milling method, and the sintering temperature at 1200 °C for 2 h. The synthesized materials were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), and vibrating sample magnetometry (VSM). The elemental makeup of the samples was characterized by energy-dispersive spectrometry (EDS). The XRD results showed the crystal structure and purity of the samples. The FTIR spectroscopy indicated tetrahedral and octahedral tensile vibrations of M-type strontium ferrite at two characteristic peak bands of 554 and 454 cm −1 . The FESEM showed that Ce doping resulted in fine grains. The EDS indicated that Ce content increased with decreasing Sr concentration but that the concentrations of other elements remained basically unchanged. The mass ratio of Sr:Fe is calculated from EDS results and the measured Sr:Fe mass ratio is quite close to the mass ratio calculated from the reactants used to synthesize each sample. The VSM showed that at a Ce doping of x = 0.02, the coercivity of the samples reached the maximum, and the coercivity values and the saturation magnetization were 3878.25 Oe and 73.625 emu/g, respectively. And such high thermal stability further determines that Ce-substituted strontium ferrites have infinite potential in application fields (T = 450.2 °C).
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 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
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 22
·20277-20284
·
IF 2.22
Wu Xiao-Hui,Tao Zheng-Xiong,Li Le-Zhong,Wu Chong-Sheng,Zhong Xiao-Xi,Wang Rui,Xiang Peng-Cheng,Li Ke-Lin,Lin Nan
In this work, Ni 0.7− x Zn 0.3 Co x Fe 2 O 4 ( x = 0, 0.05, 0.10, 0.15 and 0.20, NZCF) ferrites were successfully fabricated by solid-state reaction method. We have been more focused on the effects of cobalt-substituted NiZn ferrite on crystal structure, microstructure and magneto-electric properties. With gradual addition of cobalt content, since the smaller ionic radius and larger atomic weight of the cobalt, which leads to decrease lattice parameter ( a ) and enhance X-ray density ( d x ), respectively. The grain size ( D ) increases (4.86 ± 1.10 to 6.26 ± 1.67 μm). When x = 0.05, the initial permeability ( μ i ) of NiZnCo ferrites reaches the maximum value. The saturation magnetization ( M s) is firstly decreased slightly from 78.96 to 77.96 emu/g when x ≤ 0.10, then increased to 83.14 emu/g ( x = 0.15), ultimately decreased to 81.54 emu/g. Meanwhile, the coercivity ( H c) is dropped from 19.95 to 13.25 Oe when x ≤ 0.05, and stabilized at about 13.40 Oe when x > 0.05. From the dielectric spectrum, the real dielectric constant (ε′) exhibits typical relaxation-dispersion behavior with increasing frequency. The resistivity temperature spectrum also shows good performance: both dc resistivity ( ρ ) and activation energy ( E ρ ) increase with the Co substitution. Here, we have developed a NiZnCo ferrite when Co-substituted x = 0.05 with the highest permeability ( μ i , 123@10 kHz), higher saturation magnetization ( M s, 78.25 emu/g) and lowest coercivity ( H c, 13.25Oe), which is expected to be used in high-frequency capacitors and inductors.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2018
·Vol. 32
·期 5
·1279-1284
·
IF 1.142
Hu Hao,Niu Xiaofei
Magnetoplumbite-type (M-type) barium ferrites doped with different Y–Co doping content Ba 0.95 Y 0.05 Fe 12− x Co x O 19 ( x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) were successfully prepared by ceramic process and investigated in this paper for the first time. X-ray diffraction were used to analyze the phase of the prepared sample. The scanning electron microscopy (SEM) was used to measure the morphology, and magnetic properties were measured by vibrating sample magnetometer (VSM). The results of XRD show that the single phase of M-type barium ferrites was obtained with the increase of Co content ( x ), but α -Fe 2 O 3 occurred when x exceeds 0.3. The SEM results exhibit the uniform plane hexagonal structures of M-type ferrites with all range of Co doping content. VSM results display that magnetization ( M s ) and coercivity ( H c ) show the same tendency that their values first increase and then decrease with the increase of Co content.
研究领域:
材料科学
·
磁性材料
·
无机功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 6
·4232-4241
·
IF 3.5
Xiaoxin Chen,Hailan Qin,Hongtian Li,Yuxiao Du,Shenghao Wang,Peifeng Li,Yongming Hu,Laijun Liu,Jianwei Zhao,Dawei Wang
In many studies, the properties of BiFeO 3 –BaTiO 3 (BF–BT) ceramics vary greatly using different raw reagents, which makes it challenging to obtain reliable and repeatable properties of BF–BT-based devices. In this work, 0.7BiFeO 3 –0.3BaTiO 3 (0.7BF–0.3BT) ceramics were fabricated by a conventional solid-phase synthesis using TiO 2 reagents with varied purities of 98%, 99%, 99.9%, and 99.99%, respectively. The phase structure, microstructure, ferroelectric, and piezoelectric properties were comprehensively studied. All compositions of the ceramics exhibit a pseudo-cubic phase perovskite structure, and the fraction of the rhombohedral phase increases with increasing the TiO 2 purity. Additionally, backscattered electron images and energy-dispersive spectroscopy revealed an obvious core–shell structure within grains. In particular, the 0.7BF–0.3BT ceramics prepared with 98% purity TiO 2 exhibited superior ferroelectric and piezoelectric properties, d 33 ∼ 220 pC/N and d 33 ∗ $d_{{\mathrm{33}}}^{\;*}$ ∼ 230 pm/V. The ceramics prepared with higher purity TiO 2 suffered from severe leakage conduction, which can be well addressed by adding excess TiO 2 . Our work reveals the importance of different grades of purity TiO 2 on the electrical properties of BF–BT ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 8
·1347
·
IF 5.719
Wen Jiang,Lingling Dong,Shuanghui Liu,Shuangshuang Zhao,Kairu Han,Weimin Zhang,Kefeng Pan,Lipeng Zhang
Lithium-sulfur batteries exhibit great potential as one of the most promising energy storage devices due to their high theoretical energy density and specific capacity. However, the shuttle effect of the soluble polysulfide intermediates could lead to a severe self-discharge effect that hinders the development of lithium-sulfur batteries. In this paper, a battery separator has been prepared based on NiFe2O4/Ketjen Black (KB) modification by a simple method to solve the shuttle effect and improve the battery performance. The as-modified separator with the combination of small-size KB and NiFe2O4nanoparticles can effectively use the physical and chemical double-layer adsorption to prevent polysulfide from the shuttle. Moreover, it can give full play to its catalytic effect to improve the conversion efficiency of polysulfide and activate the dead sulfur. The results show that the NiFe2O4/KB-modified separator battery still maintains a discharge capacity of 406.27 mAh/g after 1000 stable cycles at a high current density of 1 C. Furthermore, the coulombic efficiency remains at 99%, and the average capacity attenuation per cycle is only 0.051%. This simple and effective method can significantly improve the application capacity of lithium-sulfur batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）