JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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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
CARBON
·
2020
·
IF 8.821
Yuxin Zuo,Xinran Su,Xinwei Li,Zhengjun Yao,Tingting Yu,Jintang Zhou,Jing Li,Jiong Lu,Jun Ding
Impedance matching and enhanced microwave attenuation have been proven to be effective strategies for improving reflection loss (R L ) and widening of the effective absorption (R L < −10 dB) bandwidth of absorbers. Herein, we present novel multimaterial bilayer absorbing composites consisting of graphene/Li 0.35 Zn 0.3 Fe 2.35 O 4 /polymethyl methacrylate (GFP) as the matching layer and graphene/carbonyl iron powder/polymethyl methacrylate (GIP) as the absorption layer via our multimaterial digital light processing (DLP) 3D printing method. Through numerical calculations, microwave absorption performance of the bilayer absorber is found to be greatly enhanced as compared to its constituents. In addition, the effective absorption bandwidth can be also tuned via differing ratios of the GFP/GIP layer thicknesses under a fixed total thickness. A GFP/GIP bilayer of 1.4/2.6 mm was optimized based on R L . Experimented maximum R L peaks of −46.1 and −17.9 dB were revealed at frequencies of 4.7 and 15.7 GHz, respectively, with effective absorption bandwidth up to 3.5 GHz (4.15–5.35, 14.7–17.0 GHz). The microwave absorption performance of the GFP + GIP bilayer absorber is significantly improved by proper impedance matching and multiple-type loss forms. Overall this work provides a new strategy to manufacture efficient, broadband, and adjustable microwave absorbers by 3D printing .
研究领域:
材料科学
·
电磁学
·
制造技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhiyong Jiang,Xiaodi Zhu,Jun Bao
The octahedral structure motif in spinel oxides photoelectrodes is usually recognized as a crucial factor for charge carriers transportation, which can directly influence the performance of oxygen-related photoelectrochemical (PEC) reactions at the electrode/electrolyte interface (EEI). Here in this work, a quasi-reversible oxygen-sulfur (O-S) exchange strategy is provided through facile anion exchange reaction followed by photo-assisted cyclic voltammetry (photo-CV) treatment to manipulate the FeO 6 octahedral structure motif in spinel zinc ferrite (ZnFe 2 O 4 ) photoanodes. The obtained ZnFe 2 O 4–x S x photoanodes with FeO 6−x S x units in bulk phase and activated FeO 6 units in surface region exhibit excellent PEC performance for water oxidation, delivering ≈2 orders of magnitude higher photocurrent density at 1.23 V vs. the reversible hydrogen electrode (V RHE ) compared to ZnFe 2 O 4 photoanodes under AM 1.5G illumination. Additionally, the kinetics of water oxidation reaction on ZnFe 2 O 4–x S x photoanodes is further improved upon loading NiFeO x cocatalyst, reaching a photocurrent density of 1.1 mA cm −2 at 1.23 V RHE , which ranks at the highest level among reported literature. This work opens up a new approach to facilitate the charge carriers’ transportation in spinel oxides and advances the solar water splitting performance of ZnFe 2 O 4 photoanodes for application in relevant PEC devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2018
·
IF 3.12
Can Wu,Yunyun Xu,Si Xu,Jingwei Tu,Chen Tian,Zhang Lin
In this work, zinc ferrite spinel with different zinc contents (Zn x Fe 3- x O 4 ) was synthesized by a hydrothermal method and used for removing As(V) in aqueous solution. X-ray diffraction (XRD) results indicated that in the crystal structure of Zn x Fe 3- x O 4 , the zinc atoms tended to occupy the octahedral sites for x < 0.6 and diffused into the tetrahedral sites gradually with x > 0.6. The size of Zn x Fe 3- x O 4 crystallites increased with the increasing zinc content. Batch adsorption experiments showed that the adsorption isotherms could be well described by the Langmuir model, while the adsorption kinetics followed the pseudo-second-order kinetic model. Zinc ferrite exhibited the highest adsorption capacity towards As(V) when x = 0.6. Study of the mechanism indicated that doping with zinc increased the number of surface hydroxyl groups on ferrite spinel, and thus enhanced the adsorption capacity when x = 0.6. This work revealed the effects of doping site and content of metal atoms on the adsorption ability of ferrite spinel towards As(V).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yaqing Ge,Geoffrey I.N. Waterhouse,Jing Sui,Zhiming Zhang,Liangmin Yu
The design of composites rich heterogeneous interfaces to enhance interfacial polarization is an effective way to boost electromagnetic waves (EMW) absorption performance. In this work, multi-component electromagnetic ZnFe 2 O 4 /Fe/Fe 4 N/N-doped carbon (ZnFe 2 O 4 /Fe/Fe 4 N/N-C) composites were successfully fabricated by carbonization of core/shell/shell ZnFe 2 O 4 @PDA@PPy precursors at 800 °C under a N 2 atmosphere. The ZnFe 2 O 4 /Fe/Fe 4 N/N-C composites exhibit excellent low-frequency EMW absorption performance: the effective absorption bandwidth reached 8.41 GHz (3.57–11.98 GHz), covering the entire C-band (4–8 GHz) and X-band (8–12 GHz) at a thickness of 4.5 mm with a minimum reflection loss (RL min ) of −36.13 dB at 4.54 GHz. The excellent property was attributed to the abundant heterogeneous interfaces in the ZnFe 2 O 4 /Fe/Fe 4 N/N-C composites with maximized polarization loss. Further, magnetic loss were enhanced by the introduction of Fe 4 N. This work demonstrates that the creation of heterogeneous interfaces via adding extra components is an effective strategy in the design of efficient low-frequency EMW absorbers.
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
·
2019
·
IF 3.45
M. Yousaf,Majid Niaz Akhtar,Baoyuan Wang,Asma Noor
Rare earths RE's (Pr, Y, Gd, Ho, Yb) substituted MnZn spinel ferrites with composition of Mn 0.5 Zn 0.5 M 0.02 Fe 1.98 O 4 (M = Pr, Y, Gd, Ho, Yb) are prepared by sol gel combustion approach. Low sintering temperature (500 °C) is used to sinter the RE's doped MnZn samples. MnZn samples are further characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) to measure the cubic crystalline structure, particle size, morphology, porosity and grain size. Cubic crystalline phase of prepared RE's doped MnZn ferrites is confirmed by x-ray diffraction (XRD). The morphology, porosity and grain size are observed using FESEM. The magnetic properties of RE's doped MnZn nanoferrites are analyzed by vibrating sample magnetometer (VSM). Coercivity (H c ), remanence (M r ) and saturation magnetization (M s ) are calculated from the magnetic loops. The saturation and remanence of the nanoferrites are increased by the substitution of RE's metal ions and varies from 14.76 to 26.36 emu/g and 9.98–22.48 emu/g respectively. Bohr magneton and anisotropy constant are calculated from the recorded magnetic data. The conductive analysis of the prepared samples is studied at 40 °C −300 °C temperature, leading to the conductivity measurements from 1.12 × 10 -2 Ω -1 -cm -1 to 9.52 × 10 -2 Ω -1 -cm -1 . UV–Vis spectroscopy is used to determine the semi conducting nature of RE's doped MnZn spinel ferrite samples. The magnetic, conductive and optical study of the RE's doped MnZn nanoferrites sintered at low temperature suggests the use of these materials for microwave absorption, supercapacitor , lithium ion batteries and nanoelectronics industrial applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yuzhu Li,Yanshuang Meng,Xinglian Liu,Mingjun Xiao,Qianru Hu,Ruinian Li,Xinyou Ke,Guofeng Ren,Fuliang Zhu
Zinc ferrite (ZFO) is a promising anode material to replace the conventional graphite used in lithium ion batteries . However, the unstable structure and poor electrical conductivity of ZFO hinder its practical applications. In this work, carbon-coated ZFO nanospheres anchored on the reduced graphene oxide (C/ZFO/rGO) was synthesized by the solvothermal method and subsequent carbonization with an ionic liquid . In such a sandwich structure, ZFO nanospheres are double-protected by rGO and ionic liquid-derived carbon to maintain structural integrity and enhance electrical conductivity . It was found that the discharge/charge specific capacity of lithium ion batteries with C/ZFO/rGO is capable to maintain to be 963/952 mAh g −1 after 60 cycles at a current density of 0.3 A g −1 . Its discharge/charge specific capacity can maintain to be 183.3/180.2 mAh g −1 even after 2000 cycles at a current density of 8 A g −1 . The improved cycling performance and enhanced rate capability can be explained by the enhanced electrode kinetics and less degradation of structural integrity resulted from the double-protected sandwich structure.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Daoyan Feng,Hui Yang,Xingzhong Guo
3-Dimensional hierarchically porous ZnFe 2 O 4 /C composites with interconnected macropores and co-continuous hollow skeletons are facilely synthesized and used as anode materials for Li-ion batteries. The interconnected macropores impede the agglomeration of primary particles and buffer the volumetric variations, hollow mesoporous skeletons not only improve the interfacial contact area between electrode and electrolyte but also facilitate lithium ions transfer rate. Moreover, N-doped carbon layer further enhances the conductivity and mechanical strength of skeletons, as well as accelerates electron transfer during repeated discharge and charge process. The as-prepared 3-dimensional hierarchically porous ZnFe 2 O 4 /C composites possess excellent Li-ion storage properties, delivering a high reversible capacity of 972 mAh g −1 at 200 mA g −1 after 100 cycles and a decent specific capacity of 711 mAh g −1 even at a large current density of 1000 mA g −1 after 400 cycles. These values are among the highest reported for ZnFe 2 O 4 -based materials with different morphologies and nanostructures. The resultant ZnFe 2 O 4 /C composites display the potential practical application for high-performance Li-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2022
·Vol. 8
·期 3
·1001-1013
·
IF 3.068
Chen Zhuo,Zheng Ruiqi,Ju Dianchun,Mao Rui,Ma Han,Peng Hongbing,Du Weitong
The present work focuses on the co-processing and resource recycling of solid wastes with various valuable metallic resources generated by the steel-making process. The carbon-containing pellets were prepared using zinc-bearing dust and chromium-containing sludge as the main raw materials. Then the pellets were reduced in a tube furnace with different roasting temperatures (800–1300 °C), roasting time (10–60 min), and carbon contents (9–17 wt%). The reduction mechanism of the carbothermic reduction was characterized based on thermodynamic analysis and XRD. In addition, based on the non-isothermal thermogravimetric method, the kinetics of the reducing process was investigated at heating rates of 15, 20, and 25 °C/min. The results show that mixture pellets composed of zinc-bearing dust and chromium-containing sludge can contribute to a fine integrated system. The ZnFe 2 O 4 and FeCr 2 O 4 phases can effectively be decomposed into iron oxide and chromium oxide at 1000 °C. As the temperature rises, iron oxide followed the law of stepwise reduction and was reduced to pure iron. Compared with iron oxide, chromium oxide can be reduced to pure chromium at a higher temperature. The kinetics results show that the reaction process can be divided into five stages and the main three stages follow the three-dimensional diffusion model. This study provides a new method and insight into the feasibility of the co-processing of various wastes with different valuable resources. Graphical Abstract
研究领域:
冶金工程
·
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ke Zhang,Danqing Li,Qingyun Tian,Hongyang Cao,Farid Orudzhev,Irina A. Zvereva,Jingkun Xu,Chuanyi Wang
Practical application of photocatalysis is often challenged by some intrinsic issues such as recombination of photogenerated charge carriers, stability and separation, etc. Herein, bismuth decorated 0D/2D ZnFe 2 O 4 /Bi 5 FeTi 3 O 15 (Bi/ZF/BFT) step-scheme (S-scheme) heterojunction was fabricated by an in-situ method. Due to the advantages of structure and composition, the Bi/ZF/BFT with the desired proportion (Bi/ZF/BFT-35) exhibits favorable photocatalytic performance towards tetracycline (TC) degradation. Compared with the pure ZF, the nanohybrid shows superior stability after 5 times cycle tests. Moreover, Bi/ZF/BFT-35 is convenient to be separated from the reaction system due to its magnetic nature. As identified by ESR measurement, •O 2 − and •OH radicals were involved in the photodegradation of TC, which supports that the S-scheme is successfully prepared. Also, the Bi/ZF/BFT-35 shows great ability of chemical oxygen demand (COD) removal in the practical wastewater as well. Importantly, antibacterial activity against E. coli test indicates that photodegraded TC has lower biotoxicity. The present work demonstrates that cocatalyst Bi modified ZF/BFT S-scheme can not only significantly improve its stability with good recyclability from the reaction system, but also inhibits the recombination of charge carriers, giving insight on the strategy of fabricating a promising photocatalyst for practical wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2023
·Vol. 9
·期 3
·1253-1266
·
IF 2.4
Huang Jingdong,Li Guangqiang,Yang Xiao
Natural Zn reserves might be exhausted in the following decades. Electric arc furnace (EAF) dust is an essential secondary Zn resource. The recovery of Zn from EAF dust is a critical factor in the sustainable development of the Zn industry and steelmaking industry. Efficient destruction of the ZnFe 2 O 4 crystal structure and separation of Zn and Fe are the key issues to recycle EAF dust. Molten metal chlorides are believed to be effective in breaking the structure of ZnFe 2 O 4 . This work clarifies the distinct reaction behavior between ZnFe 2 O 4 and MgCl 2 or CaCl 2 . Experiments show that although MgCl 2 is a more powerful chlorinating agent, the capability of separating Zn and Fe is not as good as that of CaCl 2 . Fast and selective chlorination of Zn from ZnFe 2 O 4 happens by reacting ZnFe 2 O 4 and MgCl 2 –CaCl 2 mixture. CaCl 2 facilitates the formation of stable Fe-bearing phases, such as MgFe 2 O 4 and Ca 2 Fe 2 O 5 , thereby inhibiting the chlorination of Fe. Moreover, it becomes more effective in promoting the selectivity of chlorinating Zn by increasing temperature after adding CaCl 2 in MgCl 2 . When ZnFe 2 O 4 is subjected to chlorination using a MgCl 2 –CaCl 2 mixture (MgCl 2 –CaCl 2 –ZnFe 2 O 4 molar ratio = 1.5:1.5:1) at 950 °C for 120 min, the process results in a chlorination percentage of over 90% for Zn, with Fe chlorination percentage lower than 5%. These results demonstrate the prospect of efficient separation of Zn from ZnFe 2 O 4 by reaction with molten MgCl 2 –CaCl 2 mixture. Graphical Abstract
研究领域:
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Suwanan Thammarong,Xiaogang Yu,Peinan Yin,Renpeng Yang,Chengwei Wu,Wei Zhang
Magnetic induction hyperthermia has great potential in cancer treatment. However, the low heating efficiency of the magnetic nanoparticles (MNPs) with self-regulated temperature capability limits its clinical application. Here, the self-regulated temperature MNPs of Ca-doped Co-Zn ferrite MNPs (Ca x Co 0.5-x Zn 0.5 Fe 2 O 4 , 0 ≤ x ≤ 0.20), with high heating efficiency, were successfully synthesized by co-precipitation method followed by heat treatment. Noticeably, the x = 0.1 suspension sample can self-stabilize the temperature for high-temperature hyperthermia, whereas x = 0.2 suspension sample can self-stabilize the temperature suitable for conventional hyperthermia under an alternating magnetic field of 32 kA/m and 100 kHz. In vitro cell experiments indicate that the MNPs have good biocompatibility. The results demonstrate that optimized saturation magnetization ( σ S ) and tunable Curie temperature (Tc) enhance both the heating efficiency and thermal safety of the nanoparticles during magnetic induction hyperthermia treatment.
研究领域:
生物医学工程
·
材料科学
·
肿瘤治疗
✓ 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）