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Elimination of Voids at Interface of β-SiC Films and Si Substrate by Laser CVD

Journal of Wuhan University of technology(materials Science) 2018年第2期33卷 356-362页

作者：朱佩佩 XU Qingfang GUO Han 涂溶 ZHANG Song YANG Meijun ZHANG Lianmeng GOTO Takashi YAN Jiasheng LI Shusen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University oJ Technology Wuhan 430070 China International School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan Tech Semiconductors Ltd. Xiangyang 441021 China

Void-free β-SiC films were deposited on Si（001） substrates by laser chemical vapor deposition using hexamethyldisilane（HMDS） as the precursor. The effect of the time of introducing HMDS, i e, the substrate temperature when HMDS introduced（T_（in））, on the preferred orientation, surface microstructure and void was investigated. The orientation of the deposited SiC films changed from 〈001〉 to random to 〈111〉 with increasing T_（in）. The surface showed a layer-by-layer microstructure with voids above T_（in） ≥ 773 K, and then transformed into mosaic structure without voids at T_（in）= 298 K. The mechanism of the elimination of voids was discussed. At T_（in） =298 K, Si surface can be covered by an ultrathin SiC film, which inhibits the out-diffusion of Si atoms from substrate and prohibites the formation of the voids.

关键词： voids HMDS β-SiC laser CVD

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Designing polymer nanocomposites with high energy density using machine learning

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npj Computational materials 2021年第1期7卷 999-1007页

作者： Zhong-Hui Shen Zhi-Wei Bao Xiao-Xing Cheng Bao-Wen Li Han-Xing Liu Yang Shen Long-Qing Chen Xiao-Guang Li Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhanChina International School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina Hefei National Laboratory for Physical Sciences at the Microscale Department of Physics and CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics University of Science and Technology of China HefeiChina Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPAUnited States School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijingChina

Addressing microstructure-property relations of polymer nanocomposites is vital for designing advanced dielectrics for electrostatic energy ***,we develop an integrated phase-field model to simulate the dielectric response,charge transport,and breakdown process of polymer ***,based on 6615 high-throughput calculation results,a machine learning strategy is schemed to evaluate the capability of energy *** find that parallel perovskite nanosheets prefer to block and then drive charges to migrate along with the interfaces in x-y plane,which could significantly improve the breakdown strength of polymer *** verify our predictions,we fabricate a polymer nanocomposite P(VDF-HFP)/Ca_(2)Nb_(3)O_(10),whose highest discharged energy density almost doubles to 35.9 J cm^(−3) compared with the pristine polymer,mainly benefit from the improved breakdown strength of 853 MVm^(−1).This work opens a horizon to exploit the great potential of 2D perovskite nanosheets for a wide range of applications of flexible dielectrics with the requirement of high voltage endurance.

关键词： polymer energy perovskite

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Effect of Al and Si additions on the synthesis of spark plasma sintered Zr2Al4C5 ceramic 9th

Effect of Al and Si additions on the synthesis of spark plas...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Guo, Qilong Pei, Junjun Gan, Jizhong Li, Junguo Zhang, Lianmeng Key Laboratory of New Building Materials and Building Energy Efficiency of Gansu Province School of Civil Engineering Northwest University for Nationalities Lanzhou730124 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

The Zr2Al4C5 ceramic was successfully fabricated by the spark plasma sintering at 1800°C for 10 min under uniaxial 20 MPa pressure in vacuum using a mixed raw materials of Zr, Al, Si and graphite powders. The X-ray diffraction analysis results showed that the unexpected Zr2Al3C5 phase rather than target compound Zr2Al4C5 formed in the sintered samples. An initial Zr: Al: C molar ratio of 2:4.2:4.8 for raw powders, and even 55 mol.% excess Al, did not lead to a phase transformation from Zr2Al3C5 to Zr2Al4C5. When 4 wt.% Si was induced in the starting powders, the major phase became Zr2Al4C5 and no obvious Zr2Al3C5 was detected in the sintered samples with an initial Zr: Al: C molar ratio of 2: 6.2: 4.8 (55 mol.% excess Al). The introduction of Si could suppress and even remove additional ZrC, and Si atoms would exclusively occupy the site of Al to make Zr2Al4C5 become a stable solid solution. The scanning electron microscopy observation showed that the as-synthesized Zr2Al4C5 grains had elongated, rod-like and/or plate-like shapes. The mechanical properties of the sintered Zr2Al4C5 ceramic were also investigated, and it showed a hardness of 11.06±0.34 GPa and a fracture toughness of 4.6 ± 0.4 MPa m1/2. © 2016 Trans Tech Publications, Switzerland.

关键词： Scanning electron microscopy

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Effect of controlling concentration on the properties of SnO2 nanocystalline for dye sensitized solar cells

Effect of controlling concentration on the properties of SnO...

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2014 Dianchi advanced materials Forum

作者： Song, Jie Guang Hua, Lin Shen, Qiang Wang, Fang Zhang, Lian Meng Hubei Key Lab of Advanced Technology of Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Department of Materials Engineering Jiujiang University JiujiangJiangxi China

ISBN: (纸本)9783038353348

The study of dye-sensitized solar cells (DSCs) based on nano-crystalline films of high band gap semiconductors is a progressive field of research that is being carried out by scientists in a wide range of lab.ratories. To improve the conversion efficiency of the DSCs, the SnO2 nanorots photocurrent, the effect of controlling concentration on the propertiesof SnO2 nano-crystalline were investigated via the hydrothermal method, and characterized by XRD, HRTEM, BET and Absorption spectrum. Though analysis the results, the conclusion is shown the pure SnO2 is preparation, the prepared SnO2 nano-crystalline under 0.05mol/L shows the particle-shape crystalline, the surface area of SnO2 nano-crystalline is 102.1683m2/g. The prepared SnO2 nano-crystalline under 1mol/L the fiber-shape crystalline, the surface area of SnO2nano-crystalline is 79.7591m2 /g. The absorbance of SnO2 nano-crystalline shows the strong absorption in the ultraviolet ray range, the absorbance of synthesized SnO2 nano-crystalline under the concentration of SnCl4solution for 1mol/L shows the higher value. © (2014) Trans Tech Publications, Switzerland.

关键词： Dye-sensitized solar cells

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Defect and Doping Co‑Engineered Non‑Metal Nanocarbon ORR Electrocatalyst

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Nano-Micro Letters 2021年第4期13卷 178-207页

作者： Jian Zhang Jingjing Zhang Feng He Yijun Chen Jiawei Zhu Deli Wang Shichun Mu Hui Ying Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China

Exploring low-cost and earth-abundant oxygen reduction reaction(ORR)electrocatalyst is essential for fuel cells and metal–air *** them,non-metal nanocarbon with multiple advantages of low cost,abundance,high conductivity,good durability,and competitive activity has attracted intense interest in recent *** enhanced ORR activities of the nanocarbons are normally thought to originate from heteroatom(e.g.,N,B,P,or S)doping or various induced ***,in practice,carbon-based materials usually contain both dopants and *** this regard,in terms of the co-engineering of heteroatom doping and defect inducing,we present an overview of recent advances in developing non-metal carbon-based electrocatalysts for the *** characteristics,ORR performance,and the related mechanism of these functionalized nanocarbons by heteroatom doping,defect inducing,and in particular their synergistic promotion effect are emphatically analyzed and ***,the current issues and perspectives in developing carbon-based electrocatalysts from both of heteroatom doping and defect engineering are *** review will be beneficial for the rational design and manufacturing of highly efficient carbon-based materials for electrocatalysis.

关键词： Defect Doping Electrocatalyst Oxygen reduction reaction Non-metal nanocarbon

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Constructing electron-blocking grain boundaries in garnet to suppress lithium dendrite growth

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Journal of advanced Ceramics 2024年第2期13卷 166-175页

作者： Xing Xiang Zecheng Fang Congkun Du Zhenzhen Zhao Jiajia Chen Yanhua Zhang Huihu Wang Chenhuinan Wei Fei Chen Qiang Shen Hubei Provincial Key Laboratory of Green Materials for Light Industry Hubei University of TechnologyWuhan 430068China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration ZoneXiangyang 441000China Collaborative Innovation Center of Green Light-weight Materials and Processing Hubei University of TechnologyWuhan 430068China New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base Hubei University of TechnologyWuhan 430068China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Li_(7)La_(3)Zr_(2)O_(12)(LLZO)is considered as a promising solid-state electrolyte due to its high ionic conductivity,wide electrochemical window,and excellent electrochemical ***,its application in solid-state lithium metal batteries(SSLMBs)is impeded by the growth of lithium dendrites in LLZO due to some reasons such as its high electronic *** this study,lithium fluoride(LiF)was introduced into Ta-doped LLZO(LLZTO)to modify its grain boundaries to enhance the performance of SSLMBs.A nanoscale LiF layer was uniformly coated on the LLZTO grains,creating a threedimensional continuous electron-blocking network at the grain *** from the electronic insulator LiF and the special structure of the modified LLZTO,the symmetric cells based on LLZO achieved a high critical current density(CCD)of 1.1 mA·cm^(-2)(in capacity-constant mode)and maintained stability over 2000 h at 0.3 mA·cm^(-2).Moreover,the full cells combined with a LiFePO_(4)(LFP)cathode,demonstrated excellent cycling performance,retaining 97.1% of capacity retention after 500 cycles at 0.5 ***,this work provides a facile and effective approach for preparing a modified electrolyte suitable for high-performance SSLMBs.

关键词： solid electrolyte garnet lithium dendrite microstructure solid-state batteries

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Effect of sintering AIDS on the properties of porous YAG ceramics 9th

Effect of sintering AIDS on the properties of porous YAG cer...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Xu, Minghan Song, Jieguang Wang, Ruihua Li, Shibin Wang, Ning Yu, Siyuan Yan, Hanxing Xia, Tingting Chen, Fei Engineering and Technology Research Center for Materials Surface Remanufacturing of Jiangxi Province School of Mechanical and Materials Engineering Jiujiang University Jiujiang332005 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

Yttrium aluminum garnet (YAG) with a chemical composition of Y3Al5O12 is an important advanced structural and functional material due to some excellent properties. The porous YAG ceramics were prepared via vacuum sintering technology, the effect of sintering aids on the properties of porous YAG ceramics were investigated in this paper. Through an analysis and discussion, the conclusions are that the porosity increases with the increasing sintering temperature from 1300°C to 1500°C, the pore is moved to the surface of sample, which forms the open pore to make the porosity increase, the more and bigger sintering neck is increased. Porous YAG ceramics are sintered at 1500°C, the regular outside shapes of porous YAG ceramic are kept using CaO and MgO as sintering aids, the outside shape of porous YAG ceramic is wrecked using Al2O3 as sintering aids, which shows the over fired phenomenon. © 2016 Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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Chinese Chemical Letters 2024年第8期35卷 25-35页

作者： Yatian Deng Dao Wang Jinglan Cheng Yunkun Zhao Zongbao Li Chunyan Zang Jian Li Lichao Jia School of Materials Science and Engineering State Key Lab of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China College of Science Qiongtai Normal UniversityHaikou 571127China Kunming Sino-Platinum Metals Catalyst Co. Ltd.Kunming 650106China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074China

Catalyst with high performance has drawn increasing attention recently due to its significant advantages in chemical reactions such as speeding up the reaction,lowering the reaction temperature or pressure,and proceeding without itself being *** the superior catalytic performance of precious metal catalysts,transition metal oxides offer a promising route for substitution of precious metals in catalysis arising from their low cost,intrinsic activity and sufficient ***-type oxide SmMn_(2)O_(5) exhibits a unique crystal structure containing double crystalline fields,and nowadays is used widely as the catalyst in different chemical reactions,including the reactions of vehicle emissions reduction and oxygen evolution reaction,gas sensors,and metal-air batteries,promoting attention in catalytic perfor-mance *** our knowledge,there is no review article covering the comprehensive informa-tion of SmMn2 O 5 and its *** we review the recent progress in understanding of the crys-tal structure of SmMn_(2)O_(5) and its basic physical *** then summarize the catalytic sources of SmMn_(2)O_(5) and reaction mechanisms,while the strategies to improve catalytic performance of SmMn_(2)O_(5) are further ***,we provide a perspective on how to make further progress in catalytic applications.

关键词： Catalyst SmMn_(2)O_(5) Mullite-type oxide Catalytic oxidation Oxygen reduction reaction Oxygen evolution reaction Reaction mechanisms

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Electroluminescence of Au/semi-insulating GaAs/Au hybrid structures under magnetic field

Electroluminescence of Au/semi-insulating GaAs/Au hybrid str...

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第十六届全国磁学和磁性材料会议暨第十七届全国微波磁学会议

作者： Z.G.Sun State Key Laboratory of Advanced Technology on Material Synthesis & Processing Wuhan University of TechnologyWuhan430070

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SiCp/Al composites fabricated by spark plasma sintering

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6th Pacific Rim Conference on Ceramics and Glass technology, PacRim6

作者： Zhang, L.M. Gu, X.F. Zhang, D.M. Yang, M.J. Wang, Z.Z. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Electric Power North China Electric Power University Beijing 102206 China

ISBN: (纸本)0470081562

SiCp/Al composites containing high volume fraction of SiC particles were fabricated by spark plasma sintering (SPS), and their thermophysical properties, such as thermal conductivity (TC) and coefficient of thermal expansion (CTE), were characterized. The principle of the fabrication was analyzed. Spark can be generated by electric field if the cavity in the green body is large enough. The melted Al by spark densify the compact which is similar to the pressure infiltration but with simple method. High relative density (R-D) of composites was successfully achieved through the optimization of sintering parameters. The measured TCs of SiCp/Al composites fabricated by SPS are higher than 195W/m·k.

关键词： Composite materials

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