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
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 12
·8737-8748
·
IF 3.531
Qingtao Lv,Xin Sun,Chunhong Zhang,Yanjian Liu,Qiang Wang,Lijia Liu,Chao Wang,Hao Wei,Xiaohui Liang
Excellent impedance matching plays a crucial role in the design of absorbers to tackle the growing problem of electromagnetism pollution. Here, a porous nickel–zinc ferrite/polyaniline/polyimide (Ni Zn Fe 3 O 4 /PANI/PI) composite was prepared by in-situ polymerization and thermally assisted non-solvent-induced phase separation (TNIPS). The impedance matching of porous Ni Zn Fe 3 O 4 /PANI/PI composite can be improved by controlling the composition ratio of Ni Zn Fe 3 O 4 /PANI absorbing filler. When the absorbing filler satisfied a molar ratio of 8:2 for Ni to Zn and a mass ratio of 2:8 for PANI to Ni Zn Fe 3 O 4 , the porous Ni Zn Fe 3 O 4 /PANI/PI composite with 20% absorbing filler content displayed the minimum reflection loss of −30.01 dB, effective absorption bandwidth of 4.05 GHz (6.91–10.96 GHz), and the impedance matching (Z) value almost equal to 1 at 9.36 GHz. In addition, the initial thermal decomposition temperature ( T 5 %) of porous Ni Zn Fe 3 O 4 /PANI/PI composite beyond 544°C in nitrogen, demonstrates superior thermal stability properties. The porous Ni Zn Fe 3 O 4 /PANI/PI composite in this research has great application potential in electromagnetic wave absorption at high-temperature environment.
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
·
2023
·
IF 5.2
Zhao Li,Guixiang Liu,Yong Ren,Fang Xu,Bo Dai,Yong Zhao,Xingwu Yuan,Jiongming Li,Dengjian Ye
In this study, the effects of different parameters (sintering temperature and holding time) of spark plasma sintering (SPS) on the microstructure and magnetic properties of LiNiZn ferrite ceramics were systematically investigated, and the samples sintered by SPS (SPS samples) were compared with the samples sintered by traditional sintering (TS samples). X-ray diffraction analysis confirmed that all the samples were ferrites with spinel structure. The microstructure of the samples was analyzed by scanning electron microscopy. Compared with TS samples, SPS samples exhibited finer and more uniform grains and denser structure. At the sintering temperature of 1000 °C, SPS samples exhibited higher saturation magnetization ( M s , 79.7 emu⋅g −1 ) and lower ferromagnetic resonance linewidth ( ΔH , 231 Oe) than TS samples ( M s : 69.3 emu⋅g −1 , ΔH : 298 Oe). The phase structure and cation distribution of the samples were analyzed by Raman spectroscopy . Herein, it was speculated that the instantaneous high temperature generated by spark plasma redistributed the cations in the crystal, and the distribution mode was stabilized by rapid cooling. Based on the change of magnetic moment of ferrite molecules caused by cation distribution, a method of judging the specific M s by fitting analysis of Lorentz curve of A 1g Raman signal of ferrite ceramics was proposed. The SPS samples showed more compact and uniform microstructure and more reasonable cation distribution than TS samples, and these characteristics were mainly responsible for the remarkable improvement of magnetic properties. The results indicate that SPS method can effectively alleviate the contradiction between M s and ΔH , and provide an alternative pathway to prepare high-performance soft magnetic ferrite.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
·
2014
·Vol. 122
·期 1429
·768-771
·
IF 0.846
Xiaobing ZHOU,Young-Hwan HAN,Yongqiang ZHANG,Qian WANG,Jie ZHOU,Lu SHEN,Tongming HUANG,Weiming PAN,Changshu XIANG,Huiping TANG,Jaehyung LEE,So Ik BAE,Dong-Yeon LEE,Qing HUANG
Ni-Carbon nanotube (CNT)-Ni0.5Zn0.5Fe2O4 multiphase composites were sintered by spark plasma sintering (SPS) technique. Ni nanoparticles were in-situ formed due to the localized carbothermal reduction by CNTs and well distributed between grain boundaries in the composites. The electrical conductivity of the resultant multiphase composites was strongly dependent on the weight percentage of CNTs. In the SPS process, CNTs acted as “heating source” and improved the consolidation of the composites. The results indicate that the introduction of the CNTs can promote the sintering kinetics of the ferrite ceramics. However, the grain growth kinetics has been inhibited by SPS and the grain size becomes finer.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yan Yang,Jie Li,Jianxiong Zhao,Xia Chen,Gongwen Gan,Gang Wang,Linfeng He
Saturation magnetization and ferromagnetic resonance linewidth are important parameters for microwave devices, such as circulator/isolator. Conventional sintering of ferrite ceramics is prevalently performed to promote the densification. Here, we present a new sintering approach for obtaining uniform and dense NiCuZn ferrite ceramics with enhanced gyromagnetic properties at low temperatures. The NiZn-series ferrites (Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 3 – 1.0 wt% Bi 2 O 3 +0.5 wt% MnO 2 ) was synthesized by solid reaction routes with new sintering approaches. The results indicate that a one-transient-step sintering process (OTSP) can significantly improve the gyromagnetic properties at low sintering temperatures by suppressing the anomalous grain growth, such as higher saturation magnetization (4π M s = ∼3904 Gauss) and lower ferromagnetic resonance linewidth ( ΔH = ∼170 Oe). Therefore, such a methodology is quite significant due to it provides a referential experience for effective sintering route that can enable broad practical applications, such as other ferrite ceramics.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 7
·1-9
·
IF 2.8
Li Wei,Dai Bo,Li Zhao,Yang Hongwei,Liu Guixiang,Xu Fang
A series of Ni x Zn 1− x Fe 2 O 4 ( NiZn, x = 0.15, 0.25, 0.35, 0.45, 0.65, 0.7, 0.8, 0.85) ferrites were prepared via a solid-phase sintering method. The microstructure, phase, and gyromagnetic properties of the NiZn samples were studied in depth. It was found that the lattice constants, density, and hardness of the samples gradually decreased with increasing Ni 2+ content. X-ray diffraction confirmed that all of the samples were in the spinel phase. Scanning electron microscopy indicated that the grain sizes were more uniformly distributed when x = 0.65. Raman analysis showed that the variation of Ni 2+ content affected the occupancy distribution of ferrite ions. The results indicated that Zn 2+ mainly occupied the A-site and that Ni 2+ mainly occupied the B-site. The coercivity ( H c ) of NiZn increased with increasing Ni 2+ content. Meanwhile, the saturation magnetization ( M s ) initially increased and then decreased. When x = 0.65, the total molecular magnetic moment started decreasing because of the decrease in the net A-site magnetic moment. The sample that had a composition of Ni 0.65 Zn 0.35 Fe 2 O 4 had the highest M s intensity with a value of 78.68 emu/g and a maximum value of 4 πM s = 4780 Gs.
研究领域:
材料科学
·
陶瓷
·
固体物理
·
磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
·
2014
·Vol. 122
·期 1430
·881-885
·
IF 0.846
Xiaobing ZHOU,Young-Hwan HAN,Jie ZHOU,Lu SHEN,Penchal Reddy MATLI,Jaehyung LEE,So Ik BAE,Dong-Yeon LEE,Qing HUANG
Ni-Carbon nanotube (CNT)-Ni0.5Zn0.5Fe2O4 multiphase composites were successfully prepared using microwave sintering (MWS) and spark plasma sintering (SPS) techniques. The obtained samples were characterized by scanning electron microscopy, electrical conductivity, and physical properties measurement system with vibrating sample magnetometer. The SPS prepared composites exhibited higher density, fine grain size, and to maintain favorable three-dimensional conductive network of CNTs compared with the microwave sintered (MWS) ones. Whether use MWS or SPS, both the density and the grain size are increasing with the CNT content increment. The increasing of density and grain size is the main contribution of the saturation magnetization increasing. In the composites of high content of CNTs (such as 5 wt %), the spinel structure of ferrite was totally destroyed, as indicated by a considerable decrease in the saturation magnetization. Interestingly, it is found that the Curie temperature increases with the increment of CNT content while the high saturation magnetization was maintained, which has implication that the multiphase ferrite composites will find application in a broad temperature range.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
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