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Electromagnetic and microwave absorbing properties of FeCoB powder composites 被引量:7
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作者 Shen-Gen Zhang Hang-Xin Zhu +3 位作者 Jian-Jun Tian De-An Pan Bo Liu Yan-Tao Kang 《Rare Metals》 SCIE EI CAS CSCD 2013年第4期402-407,共6页
The electromagnetic and microwave absorbing properties of FeCoB powder composites prepared by sin- gle-roller melt-spinning and mechanical milling processes were investigated in this paper. The result indicates that t... The electromagnetic and microwave absorbing properties of FeCoB powder composites prepared by sin- gle-roller melt-spinning and mechanical milling processes were investigated in this paper. The result indicates that the flake-like powders are obtained. As milling time increases, the flake-like powder particles tend to agglomerate, causing the flake-like powders decrease gradually. The milling time plays an important role in the electromagnetic parameters which relates to the shape and size of the powder particles. The calculation shows that the sample milled for 6 h could achieve an optimal reflection loss of -11.5 dB at 5.8 GHz, with mass fraction of 83 % and a matching thickness of 1.8 mm. The result also indicates that the microwave absorbing properties of the FeCoB powder composites are adjustable by changing their thickness, and can be applied as a thinner microwave absorbing material in the range of 2-8 GHz. 展开更多
关键词 Fe48Co48B4 powder composites Mechanical milling Electromagnetic parameters Microwave absorbing properties
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Localized Electrochemical Impedance Spectroscopy Study on the Corrosion Behavior of Fe-Cr Alloy in the Solution with Cl^- and SO_4^(2-) 被引量:6
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作者 XIAO Kui ZHANG Xin +3 位作者 D0NG Chaofang WEI Dan WANG Chen LI Xiaogang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第1期27-32,共6页
The corrosion behaviors of Fe-Cr alloy under three different pH values solutions with C1- and SO42- were investigated by localized electrochemical impedance spectroscopy (LEIS) measurements and the corrosion product... The corrosion behaviors of Fe-Cr alloy under three different pH values solutions with C1- and SO42- were investigated by localized electrochemical impedance spectroscopy (LEIS) measurements and the corrosion products were analyzed by laser Raman spectrometry. The results show that the high corrosion resistance of Fe-Cr Alloy is attributed to a passive film which is formed more easily when the alloy contains a large quantity of Cr element. However, its corrosion resistance varies in the solutions with different pH values, especially in the initial corrosion. The average impedance values in neutral and alkaline solution are much higher than that in acidic solution because the passive film is more likely to dissolve in the acidic condition. Moreover, the destructive effect of C1- and SO42 ions on the passive film is also demonstrated in corrosion process through the change of the impedance value with the steeping time. 展开更多
关键词 Fe-Cr Alloy localized electrochemical impedance spectroscopy (LEIS) corrosionproducts Raman spectroscopy
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Strontium ferrite powders prepared from oily cold rolling mill sludge by solid-state reaction method 被引量:4
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作者 Bo Liu Shen-Gen Zang +2 位作者 Jian-jun Tian De-an Pan Hang-Xin Zhu 《Rare Metals》 SCIE EI CAS CSCD 2013年第5期518-523,共6页
Oily cold rolling mill (CRM) sludge is one of the pollutants emitted by iron and steel plants. Recycling oily CRM sludge can not only reduce pollution but also bring social and environmental benefits. In this study,... Oily cold rolling mill (CRM) sludge is one of the pollutants emitted by iron and steel plants. Recycling oily CRM sludge can not only reduce pollution but also bring social and environmental benefits. In this study, using oily CRM sludge as sources of iron oxide, the strontium ferrite powders were synthesized in multiple steps including vacuum distillation, magnetic separation, oxidizing roasting, and solidstate reaction. The optimal technological conditions of vacuum distillation and oxidizing roasting were studied carefully. To consider the effects of Fe203/ SrCO3 tool ratio, calcination temperature, milling time and calcination time on magnetic properties of prepared strontium ferrite powders, the orthogonal experimental method was adopted. The maximum saturation magneti- zation (62.6 mA-m2.g-1) of the synthesized strontium ferrite powders was achieved at the Fe203/SrCO3 mol ratio of 6, 5 h milling time, 1250 ~C calcination temperature, and 1 h calcination time. Strontium ferrite powders syn- thesis method not only provides a cheap, high quality raw material for the production of strontium ferrite powders, but also effectively prevents the environmental pollution. 展开更多
关键词 Strontium ferrite powders Oily cold rolling mill sludge Solid-state reaction method RECYCLING
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Impact of sol aging on TiO_2 compact layer and photovoltaic performance of perovskite solar cell 被引量:2
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作者 郭立雪 费成斌 +4 位作者 张荣 李波 沈婷 田建军 曹国忠 《Science China Materials》 SCIE EI CSCD 2016年第9期710-718,共9页
Perovskite solar cells are known to have a power conversion efficiency dependent on subtle variation in chemical composition and crystal and microstructures of materials,processing conditions,and device fabrication pr... Perovskite solar cells are known to have a power conversion efficiency dependent on subtle variation in chemical composition and crystal and microstructures of materials,processing conditions,and device fabrication procedures and conditions.The present work demonstrates such strong dependence of power conversion efficiency on a TiO_2 film made of the same sol with various aging time.A dense and conformal TiO_2 film was prepared by sol-gel method,and the influences of its surface morphology and thickness on performance of perovskite solar cells have been investigated.The surface morphology and thickness of the TiO_2 film were tuned by adjusting the aging time of sol,resulting in enhanced short-circuit current density and fill factor of the perovskite solar cells due to increased coverage and roughness of perovskite films,light refraction,and effective charge recombination blocking effect,which were verified by means of the light absorption spectra,photoluminescence of perovskite films with and without hole transport layer,cyclic voltammogram,and electrochemical impedance spectra.The cells with a dense and conformal TiO_2 compact layer derived from the sol aged for 4 h exhibit a power conversion efficiency of 15.7%,50% higher than the efficiency based on TiO_2 layer derived from 0 h aging sol and 3 times of the efficiency with TiO_2 layer made from 8 h aged sol. 展开更多
关键词 perovskite solar cells TiO2 sol compact layer aging time
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Magnetic properties and microstructure of nanocomposite(Nd,Pr)–Fe–B ribbons by doping Nb element
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作者 Wei-Wei Yang Ji Luo +2 位作者 Hai-Jun Peng Yan-Li Sui Xue-Xu Gao 《Rare Metals》 SCIE EI CAS CSCD 2014年第2期171-175,共5页
Effects of Nb addition and annealing treatmen on magnetic properties and microstructure of(Nd0.4Pr0.6)9Fe76–xNbxB15(x = 0–4) ribbons were systematically investigated by means of vibrating sample magnetometer(VS... Effects of Nb addition and annealing treatmen on magnetic properties and microstructure of(Nd0.4Pr0.6)9Fe76–xNbxB15(x = 0–4) ribbons were systematically investigated by means of vibrating sample magnetometer(VSM) and X-ray diffraction(XRD). The extra phases with nonmagnetic(Nd,Pr)1.1Fe4B4phase and metastable compound(Nd,Pr)2Fe23B3 crystallized during quenching the Nb-free alloy. Moreover, the nonmagnetic(Nd,Pr)1.1Fe4B4phase does not diminish during the following annealing treatment. The addition of Nb to(Nd,Pr)–Fe–B alloy suppresses metastable(Nd,Pr)2Fe23B3 and nonmagnetic(Nd,Pr)1.1Fe4B4phases. The intrinsic coercivity increases from 397 kA m-1for the Nb-free sample to1,091 kA m-1for the 4 at% Nb-doped sample optimally annealed. The Nb-free sample has the magnetic properties with Js= 1.04 T, Jr= 0.66 T, and(BH)max= 43.5 kJ m-3By comparison, the magnetic properties of the 4 at% Nbdoped sample were 0.97 T, 0.68 T, and 65.7 kJ m-3respectively. The significant improvement of magnetic properties mainly originates from the finer grains of the ribbons by introducing Nb. 展开更多
关键词 Nanocomposite magnets Microstructure Magnetic properties
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Preface to the SPECIAL ISSUE: Excitonic Solar Cells(II) 被引量:1
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作者 Jianjun Tian Meicheng Li Kaibo Zheng 《Science China Materials》 SCIE EI CSCD 2016年第10期785-786,共2页
Among all the excitonic solar cells(ESCs)including dyesensitized solar cells(DSSCs),quantum solar cells(QDSCs),perovskites solar cells(PSCs),and organic photovoltaics(OPVs),PSCs attracted enormous research attention i... Among all the excitonic solar cells(ESCs)including dyesensitized solar cells(DSSCs),quantum solar cells(QDSCs),perovskites solar cells(PSCs),and organic photovoltaics(OPVs),PSCs attracted enormous research attention in the past 7 years and attained the highest power conversion efficiency(PCE)of over 20%with the biggest progress,from 3.8%to over 22.1%in 7 years.However,one can easily realize the fact that such a rapid progress achieved in PSCs was made possible is largely based on the fundamental knowledge,experimental skills,and characterization facilities obtained and accumulated through the multi-decade long endeavor in the study of other excitonic solar cells.Even though PSCs have attractedmuch research human resource and funding,the study on other excitonic solar cells has never stopped,and such persistent 展开更多
关键词 PSCs PCE Preface to the SPECIAL ISSUE Excitonic Solar Cells II
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Study on the effect of PbO on the passive behavior of alloy 690 in sodium hydroxide aqueous solution
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作者 Chengtao LI 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2010年第5期343-350,共8页
The corrosion behaviors of alloy 690 in 1 wt pct sodium hydroxide aqueous solutions with and without PbO were characterized by electrochemical measurements, including potentiodynamic polarization, electrochemical impe... The corrosion behaviors of alloy 690 in 1 wt pct sodium hydroxide aqueous solutions with and without PbO were characterized by electrochemical measurements, including potentiodynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky measurement. The results reveal that there is a great difference between the corrosion behaviors of alloy 690 in the two tested solutions. The corrosion current density in PbO-containing solution is higher than that in the solution without PbO, which may be attributed to the anodic dissolution of metallic lead deposited at the early stage of polarization. The electrochemical impedance of the specimen in PbO-free solution is higher than that in the solution containing PbO. The slope of the Mott-Schottky curve in Pb-containing solution decreases notably compared with that in the Pb-free solution, which can be interpreted by the chromium depletion in the duplex structure of passive films. 展开更多
关键词 Alloy 690 Electrochemical impedance spectroscopy PBO Mott-Schottky curve Passive film
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Preface to the SPECI AL ISSUE: Excitonic Solar Cells(Ⅰ)
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作者 Jianjun Tian Meicheng Li Kaibo Zheng 《Science China Materials》 SCIE EI CSCD 2016年第9期701-702,共2页
Search and development of clean sustainable energy or renewable energy become an imperative demand beyond the concerns of limited resource and cost of fossil fuels that our modern life is so much dependent on.Among al... Search and development of clean sustainable energy or renewable energy become an imperative demand beyond the concerns of limited resource and cost of fossil fuels that our modern life is so much dependent on.Among all the renewable energy,solar energy is the most abundant and likely to make the most significant contribution to the clean energy efforts.Although the usage of solar energy has 展开更多
关键词 Excitonic Solar Cells Preface to the SPECI AL ISSUE
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