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Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors 2006年第6期27卷 1021-1025页

作者： Wang, Kun Tang, Xinfeng Zhang, Qingjie State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Cobalt-rich filled skutterudite compounds CeyFexCo4-xSb12 (y=0-0.42) are synthesized using the melting-diffusion method. The structure and thermoelectric properties of the compounds are investigated. Results indicate that the lattice constants increase linearly with the Ce filling fraction. Hall coefficient is positive. Hole concentration and electrical conductivity decreased as the Ce filling fraction increases. Seebeck coefficient increase with the Ce filling fraction. The lattice thermal conductivity reached the minimum value when the Ce filling fraction was about 0.29, indicating that the effect of Ce rattling on phonon scattering is the strongest as Sb-dodecahedron partial voids are filled by Ce. A maximum ZT value of 0.65 is obtained for Ce0.29Fe1.41Co2.59Sb12.32 at 725 K.

关键词： Thermoelectricity

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(Bi_(0.51)Na_(0.47))TiO_(3) based lead free ceramics with high energy density and efficiency

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Journal of Materiomics 2019年第3期5卷 385-393页

作者： Yu Huang Fei Li Hua Hao Fangquan Xia Hanxing Liu Shujun Zhang State Key Lab Silicate Materials for Architecture Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Electronic Materials Research Laboratory Key Lab Ministry of Education and International Center for Dielectric ResearchSchool of Electronic and Information EngineeringXi'an Jiaotong UniversityXi'an710049China School of Chemistry and Chemical Engineering University of JinanJinan250022China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center for Smart Materials and Device IntegrationInternational School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNSW2500Australia

Dielectric ceramics with high energy storage density and energy efficiency play an important role in high power energy storage *** this work,lead free relaxor ferroelectric ceramics in (1-x) Bi_(0.51)Na_(0.47)TiO_(3-x)Ba(Zr_(0.3)Ti_(0.7))O_(3)(BNT-BZT100x:x=0.20,0.30,0.40 and 0.50)system are fabricated by conventional solid-state sintering *** BNT-BZT100x ceramics are sintered dense with minimal pores,exhibiting pseudocubic symmetry and strong relaxor characteristic.A high energy storage density of 3.1 J/cm^(3) and high energy efficiency of 91% are simultaneously achieved in BNT-BZT40 ceramic with 0.1mm in thickness,at the applied electric field of 280 kV/*** temperature stability of the energy density is studied over temperature range of 20-160℃ ,showing minimal variation below 1.5%,together with the excellent cycling reliability(the variations of both energy density and efficiency are below 3% up to 106 cycles),making BNT-BZT40 ceramic promising candidate for high-temperature dielectric and energy storage applications.

关键词： Energy storage Lead free ceramic Relaxor characteristic

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Ultrahigh Yield Strength Heterostructured Titanium Matrix Composites by Controlling Α Variant Selection

SSRN

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SSRN 2023年

作者： Zhu, Ke Huang, Jin Nie, Wei Liu, Ruxia Xiao, Yong Zhang, Jian Luo, Guoqiang Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Institute for Carbon Neutrality University of Science and Technology Beijing Beijing100083 China School of Material Science and Engineering

Enhancing the strength and plasticity of materials in a synergistic manner is a longstanding challenge in materials science. The content of β-stabilizing element W in Ti alloys is controlled using a chemical boundary engineering (CBE) strategy. Heterostructured Ti-xW composites are designed with α grain boundaries as the outer shell, α/β lamellar organization as the intermediate transition layer, and acicular martensite as the core region. This material exhibits a remarkable compressive yield strength of 2100 MPa, surpassing the majority of reported titanium matrix composites. The exceptional strength primarily arises from the precipitation strengthening of α/β lamellar organization and acicular martensite in the core region. Additionally, the gradient structure resulting from varying concentrations of W elements contributes to hetero-deformation induced (HDI) strengthening. This study holds significant implications for the development and design of high-strength heterostructured titanium matrix composites. © 2023, The Authors. All rights reserved.

关键词： Martensitic transformations

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Pulsed laser deposition of stoichiometric KNbO 3 films on Si (100)

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Thin Solid Films 2008年第23期516卷 8559-8563页

作者： R. Yang S.Y. Shen C.B. Wang Q. Shen L.M. Zhang School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 PR China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China

KNbO 3 films were prepared on Si (100) substrates by pulsed laser deposition. The effect of experimental parameters on the films structure and composition was investigated. Well crystallized and single-phase KNbO 3 films were obtained at the substrate temperature of 650 °C, laser energy of 7.5 mJ/pulse and target-substrate distance of 40 mm, but a severe potassium-deficient was observed in the deposited films. The mechanism of K deficiency in films was explored and a method to control the composition was designed. The experimental results indicate that the composition of films can be well controlled by adjusting the oblique angle of substrates from the axial direction of plume. The stoichiometric KNbO 3 films with K/Nb molar ratio of 0.98 were obtained by locating the substrate at an oblique angle of 3–12° from the plume axis.

关键词： KNbO 3 thin films Pulsed laser deposition (PLD) Composition control Potassium niobiate X-ray diffraction Electron probe microanalysis

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Electrical Properties and Degradation Behavior of Bnt-Bt-Ln Ceramics

SSRN

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SSRN 2023年

作者： Xu, Qi Yan, Xuerui He, Xin Dong, Shengde Ma, Luxiang Hai, Chunxi Zhou, Yuan Liu, Hanxing College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu610059 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China

Dielectric capacitors are widely used in pulse power systems, electric vehicles, aerospace and defense technology as critical electronic components. Due to the miniaturization and diversification of electronic components, higher requirements are put on the electrical properties and the service life of dielectric capacitors. In this paper, the phase structure, microstructure, dielectric, ferroelectric and failure behavior of (1-x)(Bi0.5Na0.5TiO3-BaTiO3)-xLiNbO3 (BNT-BT-LN, x = 0.01, 0.03, 0.05, 0.07, 0.10) lead-free ceramics were investigated. All the samples exhibited perovskite phase with no secondary impurity. With increasing LiNbO3 concentration, the average grain size gradually increases from 0.78 μm to 1.75 μm. For the composition x = 0.07, the temperature coefficient of capacitance (TCC150°C) was lower than 15% in the range of 35 °C - 400 °C with moderate permittivity (Εr 150 °C = 2050) and low dielectric loss (tanδ150 °C = 0.005). The RC constant is above 19.3 s up to 245 °C. Through Highly Accelerated Life Test (HALT), the mean time to failure (TTF) empirical formula for BNT-BT-LN dielectrics is established. It indicates that the degradation of the insulation resistance process is caused by the electromigration of oxygen vacancies and the TTF is predicted to reach 4.67×106 h at 7 kV/mm and room temperature. © 2023, The Authors. All rights reserved.

关键词： Lithium compounds

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Preface to the Special Issue on Photocatalytic H2 Production and CO2 Reduction

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Chinese Journal of Catalysis 2020年第1期41卷 1-1页

作者： Jiaguo Yu Jian Ru Gong Quanjun Xiang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology National Center for Nanoscience and Technology State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China

Jointly hosted by Wuhan University of technology,Changsha University and Kent state University,the 3rd International Workshop on Graphene and C3N4-based Photocatalysts(IWGCP3)was held at Wuhan University of technology,Wuhan,China on March 23-26,*** workshop was sponsored by National Natural Science Foundation of China(NSFC),Wuhan University of technology,Changsha University,Beijing Perfectlight and *** 300 colleagues from all over the world participated in this workshop,which featured 8 plenary lectures,12 keynote lectures,22 invited lectures,13 oral lectures and 157 *** ten posters enjoyed recognition by the scientific committee during the workshop.

关键词： Wuhan Perfect workshop

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Finite element analysis of three dimensional transient stress in 300MW boiler drum

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/...

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2007年第1期31卷 60-62+69页

作者： Yin, Qizhi Xiao, Jinsheng Jiang, Ailin Chen, Yiping Zhao, Zaili School of Energy and Power Engineering WUT Wuhan 430063 China School of Automobile Engineering WUT Wuhan 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing WUT Wuhan 430070 China Hunan Electric Power Test and Research Institute Changsha 410007 China

Taking the running parameters of boiler drum in 8 typical working conditions as data of boundary conditions, the transient thermal stress, mechanical stress and total stress of a 300MW boiler drum is calculated by finite element method. The results show that when the vapor pressure is close to or higher than the normal working vapor pressure, the temperature difference on the boiler wall has little influence on the total stresses. The vapor pressure in boiler drum is the main influential factor to the total stresses, and there is a proportion relationship between them. With the relationship, the maximum stress in the drum can be calculated.

关键词： Boiler Drum Finite element Stress analysis

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Ag-Pd Bimetallic Hollow Nanostructures with Tunable Compositions and Structures for the Reduction of 4-Nitrophenol

SSRN

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SSRN 2022年

作者： Ma, Wenjuan Zhang, Guimin Fu, Zhengyi School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Bimetallic hollow nanostructures are of interest for high-performance nanocatalysis and utilization efficiency of noble metals. The paper reported a synthesis of Ag-Pd bimetallic hollow nano-hexagon with outer sizes of about 27 nm and wall thicknesses of 3 to 5 nm by galvanic replacement reaction coupling with co-reduction method using Ag nanospheres as sacrificial templates. Cetyltrimethylammonium bromide (CTAB) had double effect on controlling morphologies. It served as the capping agent to mediate the rate of dissolution and deposition on different planes by selectively absorption, meanwhile it provided Br - ion to involve in the reaction and promote the thermodynamics of the galvanic replacement. The compositions and structures of Ag-Pd bimetals could be finely tuned by changing the amount of palladium chloride acid (H 2 PdCl 4 ) while maintaining the volume of Ag seed templates. By comparison of the rate constant k m of 4-nitrophenol reduction reaction over different samples as catalyst, hollow bimetallic nano-hexagon with composition of AgPd 0.76 exhibited the highest catalytic activity because of high surface areas and synergy effect between two metal. © 2022, The Authors. All rights reserved.

关键词： Chlorine compounds

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Tuning ferroelectricity of polymer blends for flexible electrical energy storage applications

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Science China materials 2021年第7期64卷 1642-1652页

作者： Xin Zhang Yanda Jiang Ruoqi Gao Xinhui Li Zhonghui Shen Bao-Wen Li Qingfeng Zhang Shujun Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Lab of Ferro&Piezoelectric Materials and Devices School of Materials Science&EngineeringHubei UniversityWuhan 430062China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNorth WollongongNSW 2500Australia School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijing 100084China

Ferroelectric polymers are the mainstay of advanced flexible electronic *** to tailor the ferroelectric polymer films for various applications via simple processing approaches is *** we demonstrate the tuning of ferroelectric responses can be achieved in polymer blends of poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE))and polymethyl methacrylate(PMMA)prepared via a simple two-step *** proposed two-step process endows the polymer blends with a random distribution of P(VDF-TrFE)crystalline phase,hence decoupling the coherent ferroelectric domain interactions between continuous ordered crystalline phases that ubiquitously existed in common P(VDF-TrFE)*** incorporation of the miscible non-crystalline PMMA chains with low-polarity results in reversal dipoles and a transition from ferroelectric to antiferroelectric-like behavior,overcoming the trade-off between the polarization and depolarization *** particular,resultant excellent mechanical and electrical properties of the polymer blend films give rise to remarkably improved breakdown strength and energy storage performance,surpassing P(VDF-TrFE)and commercial biaxial-oriented polypropylene *** work provides a simple and effective strategy to tailor the ferroelectric response of polymeric materials with great potential for flexible electrical energy storage applications.

关键词： ferroelectric polymers antiferroelectricity energy density breakdown strength dielectric

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Chemical equilibrium controlled synthesis of polyoxymethylene dimethyl ethers over sulfated titania

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Journal of Energy Chemistry 2015年第2期24卷 239-244页

作者： Huaju Li Huanling Song Feng Zhao Liwei Chen Chungu Xia Laboratory for Nano-Catalytic Material & Technology Division of Advanced Nano?materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences

The chemical equilibrium and reaction kinetic behavior in the synthesis of polyoxymethylene dimethyl ethers （DMMn） were investigated over sulfated titania in order to reveal the decisive factor controlling the reaction. The results showed that the molar ratio of adjacent DMMn products in equilibrium solution had the same value, which depended absolutely on the reaction temperature. Meanwhile, the reactions had the same DMMn products distributions under varied reaction conditions. The equilibrium constants of the related step-wise reactions for DMMn formation were equal, which were calculated based on the bulk compositions of the reaction solution. And thus, the selectivity to DMMn was mainly controlled by the chemical equilibrium, i.e., thermodynamic control. In brief, the present results provide some guidance for future synthesis of DMMn.

关键词： polyoxymethylene dimethyl ethers sulfated titania chemical equilibrium reaction kinetic molar ratio

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