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Hydrothermal synthesis and Photo-catalytic Property of Bi25FeO40 Powders

Hydrothermal Synthesis and Photo-catalytic Property of Bi25F...

2009 The 18th IEEE International Symposium on Applications of Ferroelectrics(2009年国际铁电学暨IEEE国际铁电应用联合会议)

作者： C. Y. Zhang H. J. Sun W. Chen J. Zhou B. Li Y. B. Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology 122 Luoshi RoadWuhan430070China

Bi25FeO40 powders have successfully been synthesized by simple hydrothermal method. The effect of the concentration of mineralizer and stoichiometry on the prepared samples was investigated. With the UV-Vis spectra, Bi25FeO40 powders have a broad absorption band in the range of 400-600 nm and a good visible-light-response ability. Photo-catalytic activity of Bi25FeO40 powders was evaluated by the degradation of methyl violet solution under UV-Vis light irradiation, which is found that Bi25FeO40 is efficient for photo-degradation of the methyl violet due to its own crystal structure.

关键词： iron sillenite hydrothermal synthesis photo-absorption photo-degradation

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Enhanced Dielectric Properties of Ca(Mg1/3Nb2/3)O3 / CaTiO3 Multilayer Heterogeneous Thin Films

Enhanced Dielectric Properties of Ca(Mg1/3Nb2/3)O3 / CaTiO3 ...

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2009 The 18th IEEE International Symposium on Applications of Ferroelectrics(2009年国际铁电学暨IEEE国际铁电应用联合会议)

作者： J. Shen J. Zhou J. Zhu Q. Lei H. Wang C. Y. Zhang W. Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology Luoshi Road 122Wuhan430070China

CCa(Mg1/3Nb2/3)O3/CaTiO3 (CMN/CT)heterostructure dielectric thin films, with the same thickness but different arrangement patterns, were prepared by Pechini method. The effects of the heterogeneous interface on the structure and properties have been studied. The results showed that, in nonalternating arrangement films, single perovskite phase can only be obtained in TM heterostructure film, in which CaTiO3 layer has grown on the substrate firstly, and the dielectric properties of this film is εr=47.5, tanδ=0.020 at 1MHz. Comparing with non-alternating arrangement film, all alternating arrangement films have single perovskite phase, and the existing of heterogeneous interface enhanced the dielectric properties of TMM and MMT alternating arrangement films by introducing space charges. And the dismatch between CMN and CT layers can avoid the harmful particle forming, improve crystallization and surface morphology, and keep the dielectric loss at a low level. At 1MHz, the dielectric constant (εr) of TMM and MMT films are 66.3 and 63.6, while both dielectric loss (tanδ) are 0.021.

关键词： CMN/CT heterostructure dielectric thin film heterogeneous interface dielectric properties dielectric enhance

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A Novel Violet and Blue Enhanced SINP Silicon Photovoltaic Device

A Novel Violet and Blue Enhanced SINP Silicon Photovoltaic D...

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Photonics and Optoelectronics, SOPO

作者： Bo He QuanMa Zhong Xu Jing Lei Zhao Feng Li Cheng Shen NanSheng Zhang ZhengShan Yu YanTing Yin Department of Physics Shanghai University Shanghai China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WuHan University of technology WuHan HuBei China

A novel ITO/SiO 2 /np Silicon SINP violet and blue enhanced photovoltaic device has been fabricated by thermal diffusion of phosphorus for shallow junction to enhance the spectral responsivity within the wavelength range of 400-600 nm, low temperature thermally grown an ultrathin silicon dioxide and RF sputtering ITO antireflection coating to reduce the reflected light and enhance the sensitivity. The current-voltage (I-V) characteristics, spectral response and responsivity of high quantum efficiency of violet SINP photovoltaic device and deep junction SIcircldquoNP photovoltaic device were calculated and analyzed in detail.

关键词： Photovoltaic systems Solar power generation Indium tin oxide Semiconductor films Surface waves Laboratories Silicon compounds Radio frequency Sputtering Photonic band gap

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Study of a Novel ITO/AZO/SiO2/p-Si SIS Heterojunction

Study of a Novel ITO/AZO/SiO2/p-Si SIS Heterojunction

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Photonics and Optoelectronics, SOPO

作者： Bo He QuanMa Zhong Jing Xu Lei Zhao Feng Li Cheng Shen NanSheng Zhang ZhengShan Yu YanTing Yin Department of Physics Shanghai University Shanghai China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WuHan University of technology WuHan HuBei China

ITO/AZO double films were deposited by RF sputtering on p-Si(lOO) substrate to fabricate ITO/AZO/SiCVp-Si SIS heterojunction. The structural, optics and electrical properties of the ITO/AZO films were characterized by UV-VIS spectrophotometer, four point probe and Hall effect measurement, respectively. The results show that ITO/AZO films have good quality. The electrical junction properties were investigated by I-V measurement, which reveals that the heterojunction shows typical good rectifying behavior and great photoelectric effect.

关键词： Indium tin oxide Heterojunctions Optical films Sputtering Zinc oxide Electrodes Radio frequency Semiconductor films Substrates Optical surface waves

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Effect of Co2O3-doped on dielectric properties of tungsten-bronze structure ceramic Ba4Eu2Fe2Nb8O3030

Effect of Co2O3-doped on dielectric properties of tungsten-b...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： X.Y. Peng L. Fang C.C. Li C.Z. Hu B.L. Wu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of Technology GLITE Guilin China Guilin University of Technology Guilin Guangxi CN

In present work, undoped and Co 2 O 3 -doped Ba 4 Eu 2 Fe 2 Nb 8 O 30 ceramics were fabricated by routine solid state method. Wide temperature range measurement shows two kinds of dielectric peaks. The low-temperature peak attributes to ferroelectric-paraelectric phase transition. The high-temperature peak is affected greatly by Co 2 O 3 additives. With increasing the content of Co 2 O 3 dopant the second peak vanished, indicating that it is related to space charge.

关键词： Dielectric materials Ceramics Educational technology Temperature measurement Dielectric measurements Ferroelectric materials Temperature distribution Niobium compounds Laboratories Permittivity

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Dielectric and Ferroelectric Properties of Ba4Gd2Fe2Nb8O30 with filled tungsten-bronze structure

Dielectric and Ferroelectric Properties of Ba4Gd2Fe2Nb8O30 w...

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2009 The 18th IEEE International Symposium on Applications of Ferroelectrics(2009年国际铁电学暨IEEE国际铁电应用联合会议)

作者： Chun Chun Li Liang Fang Xi Yang Peng Chang Zheng Hu State Key Laboratory of Advanced Technology forMaterials Synthesis and Processing Wuhan University of TechnologyWuhan 430070PR China Key Laboratory of Nonferrous Materials and NewProcessing TechnologyMinistry of Education Guilin University of Tech

Polycrystalline sample of Ba4Gd2Fe2Nb8O30 ceramics were prepared by a high temperature solid-state reaction technique. The structure and dielectric properties as well as the behavior of ferroelectric phase transition have been investigated. The dielectric spectra are characterized in wide frequency (40Hz-1MHz) and temperature (25℃-600℃). At 1MHz, the room temperature dielectric constant of Ba4Gd2Fe2Nb8O30 ceramic is 160 together with dielectric loss of 0.054. Two dielectric abnormalities were detected at the temperature dependence of dielectric spectra in low and high temperature ranges, respectively. The low temperature peak (145℃) is frequency independence, while the higher temperature (300℃-600℃) one is extremely high relaxorlike, with very strong frequency dispersion. The high temperature peak was not relaxor ferroelectric but an oxygen defect induced dielectric abnormity, while the low temperature one was proposed to the ferroelectricparaelectric phase transition. The ferroelectric nature of the present materials is confirmed by the P-E hysteresis loop, with 2 Prof 1.5μC/cm2.

关键词： ferroelectric TB dielectric properties

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Calculation on model of weakening hydrogen bond of thick oil of petroleum

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Journal of Energy and Power Engineering 2009年第12期2卷 53-59页

作者： MiN Xin-min WANG Xu-chao CHEN Feng CHEN Yan-ling Chemistry Department School of Sciences Wuhan Universio of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Faculty of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

The process of use catalyst or functional material that contains iron ion to weaken -O-H-O- hydrogen bond of the thick oil to reduce viscidity or crack, in aspects of the ion charge. covalent bond order, total energy and the average distance of Fe-O. is studied with density function theory and discrete variational method （DFT-DVM）, one of the first principle methods. With the decrease of the distance of Fe-O. the charge of Fe ion increases, the charge of hydrogen ion decreases, and hydrogen bond is weakened. There are obvious and more stable effects to use the catalyst that contains multiple metal ions or increase the catalyst amount in weakening hydrogen bond of the thick oil. This theoretic work is helpful to exploit and process the thick oil of petroleum and maybe overcome the crisis of petroleum energy is approaching to us.

关键词： calculation： hydrogen bond： weaken： thick oil： petroleum

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synthesis and performance of ultrafine 5083 aluminum alloy powders by cryomilling

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2009年第SUPPL. 1期38卷 408-411页

作者： Ma, Xiu-Hua Wang, Wei-Min Guo, Wei Jia, Tie-Kun Fu, Zheng-Yi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

5083 aluminum Alloy was prepared by cryomilling method. The microstructure, microstructural evolution and thermal stability and of sample powder were investigated by XRD, SEM and DSC. The results showed that the particles size of 5083 alloy powder during cryomilling was gradually reduced, Mg phase was gradually disappeared and super-saturated to Al;Milling time and milling speed were the main factors of affected alloy structure and performance, and high speed cryomilling could result in more uniform nanometer grains. Energy spectrum analysis and DSC suggest that the thermal stability of the cryomilling 5083 alloy powder was improved at certain extent, it may be attributed to the presence of nano-scale Al2O3 particles.

关键词： Microstructure

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Research on preparation process of boron carbide ceramics sintered by spark plasma sintering

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2009年第SUPPL. 1期38卷 145-149页

作者： Chen, Gang Zhang, Song Wang, Chuan-Bin Shen, Qiang Zhang, Lian-Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Boron carbide ceramics were synthesized and desificated in one step by spark plasma sintering (SPS) technique using boron and graphite powders as raw materials. The impact of sintering temperature, sintering pressure, holding time and heating program, on sintering performance of boron carbide ceramics was studied. The results indicated that the starting temperature of synthesis was at 1100°C;higher temperature and pressure, appropriate holding time and heating-up rate, as well as two holding steps were beneficial to densification of boron carbide ceramics. The suitable SPS process conditions were optimized as: sintering temperature of 1800°C, pressure of 40 MPa, holding time of 6 min, heating-up rate of 100°C/min, and two holding steps, on which boron carbide ceramics of higher density were obtained.

关键词： Boron carbide

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Template-free hydrothermal fabrication of hierarchically organized γ-AlOOH hollow microspheres

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Microporous and Mesoporous materials 2009年第1-3期122卷 42-47页

作者： Weiquan Cai Jiaguo Yu Stephen Mann State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Chemical Engineering Wuhan University of Technology Luoshi Road 122# Wuhan 430070 PR China Centre for Organized Matter Chemistry School of Chemistry University of Bristol Bristol BS8 1TS UK

Hierarchically organized γ-AlOOH hollow spheres with nanoflake-like porous surface textures were fabricated by chemically induced self-transformation of metastable solid particles of amorphous aluminium oxyhydroxide produced in situ within hydrothermal reaction mixtures containing aluminium sulfate and urea. Thermal treatment of the γ-AlOOH product at 600 °C produced intact hollow spheres of γ-Al 2 O 3 . Formation of the hollow γ-AlOOH structures was strongly dependent on the reaction temperature and time, as well as the concentration and molar ratio of the reactants. Hollow γ-AlOOH spheres were not obtained using mixtures of urea and aluminium nitrate or aluminium chloride, as metastable precursor particles were not produced under these conditions. In general, the described method is efficient and environmentally benign, and has significant advantages over traditional template approaches to the large-scale production of hollow inorganic materials. The prepared hierarchically organized γ-AlOOH and γ-Al 2 O 3 hollow spheres should have important applications in areas of catalysis, separation science, biomedical engineering and nanotechnology.

关键词： γ-AlOOH Hollow Microspheres Hierarchically Chemically induced self-transformation approach

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