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Effect of Fe_(2)O_(3)on the Structure,Physical Properties and Crystallization of CaO-Al_(2)O_(3)-SiO_(2)Glass

Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 954-961页

作者：张峰 xiong dehua 谢俊张继红 HAN Jianjun CHEN Dequan WEN Zhongquan FAN Zhenhua CHEN Lina SUN Tengfei State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Hepu Research Center for Silicate Materials Industry Technology Beihai 536100China Hainan Institute of Wuhan University of Technology Sanya 430079China Shenzhen Research Institute of Wuhan University of Technology Shenzhen 518000China Chongqing Polycomp Inter-national Corporation Chongqing 400400China

The calcium aluminosilicate-based glasses(CaO-Al_(2)O_(3)-SiO_(2),CAS)with different Fe_(2)O_(3)content(0.10wt%,0.50wt%,0.90wt%,and 1.30wt%)were prepared by traditional melt-quenching *** glass network structure,thermal and mechanical properties,and crystallization behavior changes were investigated by nuclear magnetic resonance spectrometer,Fourier-transform infrared spectro-photometer,X-ray diffractometer,differential scanning calorimetry and field emission scanning electron microscope *** change of Q^(n)in glass structures reveals the glass network connectivity decreases due to the increasing content of Fe_(2)O_(3)addition,resulting in the increasing of non-bridging number in glass *** glass densities slightly rise from 2.644 to 2.681 g/cm^(3),while Vickers’s hardness increases at first,from 6.469 to 6.901 GPa,then slightly drops to 6.745 GPa,with Fe_(2)O_(3)content *** is almost no thermal expansion coefficient change from different Fe_(2)O_(3)*** glass transmittance in visible range gradually decreases with higher Fe_(2)O_(3)content,resulting from the strong absorption of Fe^(2+)and Fe^(3+)*** calculated activation energy from thermal analysis results first decreases from 282.70 to 231.18 kJ/mol,and then increases to 244.02 kJ/mol,with the Fe_(2)O_(3)content increasing from 0.10wt%to 1.30wt%.Meanwhile,the maximum Avrami constant of 2.33 means the CAS glasses exhibit two-dimensional *** of the CAS glass-ceramics samples contain main crystal phase of anorthite,the microstructure appears lamellar and columnar crystals.

关键词： calcium aluminosilicate glass network structure physical properties crystallization

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Tailoring effect of Y_(2)O_(3)on water resistance of Na_(2)O-ZnO-Al_(2)O_(3)-B_(2)O_(3)glasses

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Journal of Rare Earths 2022年第8期40卷 1316-1322页

作者： Mitang Wang Ao Li Xiaowei Zhang Dongliang Zhang Siqingaowa Jin dehua xiong Wei Deng School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Silicate Materials for Architecture Wuhan University of TechnologyWuhan 430070China Materials and Engineering Research Institute Sheffield Hallam UniversitySheffieldS11WBUK

To explore the improving effect of Y_(2)O_(3)on the water resistance of xY_(2)O_(3)-(100-x)(0.05 Al_(2)O_(3)-0.15 ZnO-0.15 Na_(2)O-0.65 B_(2)O_(3))(x=0,0.7 mol%,1.4 mol%,2.1 mol%,2.8 mol%)glasses,glass structure and ion migration characteristics were respectively characterized by an infrared spectrometer and an electrochemical workstation.X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive Xray spectroscopy(EDS)and inductively coupled plasm-atomic emission spectrometry(ICP-AES)were used to comprehensively analyze the alteration *** experimental results show that with the increase of Y_(2)O_(3)content,the mass loss per unit area of the glass is significantly reduced,and pH in leaching solution has the same change trend with mass loss of the glass,which indicates the improving effect of Y_(2)O_(3)addition on the studied *** content of[BO_(4)]structural unit and dc conductivity of glass increase firstly and then decrease with the increase of Y_(2)O_(3)content,and reach a maximum at x=0.7 mol%.Although addition of Y_(2)O_(3)plays the role in the changes of glass structure and ion migration characteristics,the more important influence of Y_(2)O_(3)is on the glass surface alteration layer.Y and Zn elements are enriched on the glass surface and finally transformed into an alteration layer,moreover,the adhesion between the alteration layers and the glass matrix is enhanced with the increase of Y_(2)O_(3)content,which effectively blocks the further interdiffusion between the water molecules and the glass matrix.

关键词： Borate glass Chemical durability Y_(2)O_(3) Structure Rare earths

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中小银行发展如何影响中小企业融资？--兼析产生影响的多重中介效应

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金融研究 2016年第12期 78-94页

作者：李广子熊德华刘力中国社会科学院金融研究所/国家金融与发展实验室北京100028 北京大学光华管理学院北京100871

如何有效解决中小企业融资难是学术界和实务界普遍关心的一个问题。基于中国工业企业数据库数据,本文从企业微观层面考察了中小银行发展是否有助于改善中小企业借款融资状况,并利用多重中介模型对中小银行发展影响中小企业借款融资的中... 详细信息

如何有效解决中小企业融资难是学术界和实务界普遍关心的一个问题。基于中国工业企业数据库数据,本文从企业微观层面考察了中小银行发展是否有助于改善中小企业借款融资状况,并利用多重中介模型对中小银行发展影响中小企业借款融资的中介效应进行了分析和比较。本文发现,中小银行发展能够显著缩小中小企业与大企业在借款融资上的差异,同时能够缓解紧缩货币政策对中小企业借款融资造成的负面冲击。进一步,本文从提高金融发展水平和优化银行业结构两个方面分析和比较了中小银行发展影响中小企业借款融资的中介效应。本文发现,尽管通过优化银行业结构也对缓解中小企业借款融资困难起到一定积极作用,但中小银行发展更主要是通过提高金融发展水平来改善中小企业借款融资状况。本文的研究对于我国中小企业融资问题的解决具有重要的参考价值。

关键词：中小银行金融发展银行业结构中小企业融资国多重中介模型

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Preparation of B_(2)O_(3)-ZnO-SiO_(2)Glass and Sintering Densification of Copper Terminal Electrode Applied in Multilayer Ceramic Capacitors

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 960-968页

作者： YUE Yi LI Hong CAO Xiuhua ZHANG Xuehui HUANG Jun HUANG Xuye ZHANG Yongqiang XU Ruipeng xiong dehua State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Guangdong Fenghua Advanced Technology Holding Co.Ltd. Zhaoqing 526000China

B_(2)O_(3)-Zn O-SiO_(2)(BZS)glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper terminal electrode for multilayer ceramic capacitors(MLCC)*** structure and property characterization of B_(2)O_(3)-Zn O-SiO_(2)glass,including X-ray diffraction,FTIR,scanning electron microscopy,high-temperature microscopy,and differential scanning calorimetry,indicated that the addition of CuO improved the glass’s acid resistance and glass-forming *** wettability and acid resistance of this glass were found to be excellent when CuO content was 1.50 wt%.Compared to BZS glass,the CuO-added glass exhibited excellent wettability to copper powder and corrosion resistance to the plating *** sintered copper electrode films prepared using the glass with CuO addition had better densification and lower sintering temperature of 750℃.Further analysis of the sintering mechanism reveals that the flowability and wettability of the glass significantly impact the sintering densification of the copper terminal electrodes.

关键词： B_(2)O_(3)-ZnO-SiO_(2)(BZS) low melting glass MLCC densification copper terminal electrode

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Effect of ZnO,La_(2)O_(3),and YF_(3)on Crystallization and Rehological Behavior of Y_(2)O_(3)-Al_(2)O_(3)-SiO_(2)Glass

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Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 753-758页

作者：王君 GAO Shengnan ZHENG Qingshuang ZHANG Xiaowei ZHANG Dongliang xiong dehua JIN Siqingaowa 王觅堂焦国豪 School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai200093China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010China Guangxi Academy of Sciences Nanning530000China

The effect of substitution La_(2)O_(3)and YF_(3)as network modifiers respectively for Y_(2)O_(3),and ZnO as intermediate oxide for Al_(2)O_(3)on crystallization and viscous behavior of Y_(2)O_(3)-Al_(2)O_(3)-SiO_(2)glass was ***_(2)O_(3)and YF_(3)substitution for Y_(2)O_(3)decreases the melting temperature of studied glass from 1402 to 1346 and 1379℃,and the activation energy of viscous flow decreases from 340 to 250 and 265 kJ/***,ZnO substitution for Al_(2)O_(3)decreases the melting temperature to 1379℃while increases the activation energy of viscous flow to 542 kJ/mol,due to their different role in glass *** ZnO for Al_(2)O_(3)refines and homogenizes the crystals size and lowers crystallinity because the nucleation and crystal growth are depressed by higher activation energy of crystallization and change of crystallization mechanism from bulk crystallization to surface *** of Y_(2)O_(3)by La_(2)O_(3)and YF_(3)respectively also decreases the crystallinity of Y_(2)O_(3)-Al_(2)O_(3)-SiO_(2)glass ceramic due to competitive and hindering effect on the rearranged atoms,structural units and groups required by precipitated two ***,y-Y2Si2O7,precipitation of Y4.67(SiO4)3O,ZnAl_(2)O_(4),and Y3Si3O10F were observed respectively due to incorporation of La_(2)O_(3),ZnO,and YF_(3).

关键词： Y_(2)O_(3) aluminosilicate glass crystallization viscous activation energy

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Recent progress on tandem structured dye-sensitized solar cells

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Frontiers of Optoelectronics 2012年第4期5卷 371-389页

作者： dehua xiong Wei CHEN Michael Gratzel Centre for Mesoscopic Solar Cells Wuhan National Laboratory for OptoelectronicsCollege of Optoelectronic Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Tandem structured dye-sensitized solar cells （DSSCs） can take full advantage of sunlight, effectively broadening the absorption spectrum of the cell, resulting in a higher open circuit voltage or short circuit current than that of the conventional DSSC with single light absorber. The theoretical maximum efficiency is therefore suggested to be over the Schottky-Queisser limit of 33%. Accord- ingly, tandem design of DSSC is thought to be a promising way to break the performance bottleneck of DSSC. Besides, the tandem designs also broaden the application diversity of DSSC technology, which will accelerate its scale-up industrial application. In this paper, we have reviewed the recent progress on photo-electrochemical applications associated with kinds of tandem designs of DSSCs, in general, which are divided into three kinds：＂n- type DSSC ＋ n-type DSSC,＂＂n-type DSSC ＋ p-type DSSC＂ and ＂n-type DSSC ＋other solar conversion devices.＂ The working principles, advantages and chal- lenges of these tandem structured DSSCs have been discussed. Some possible solutions for further studies have been also pointed out together.

关键词： dye-sensitized solar ceils (DSSCs) tandemstructure photo-electrochemical cell

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Hydrothermal synthesized delafossite CuGaO_(2) as an electrocatalyst for water oxidation

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Frontiers of Optoelectronics 2022年第1期15卷 80-91页

作者： Han Gao Miao Yang Xing Liu Xianglong Dai Xiao-Qing Bao dehua xiong State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Optical Technologies on Nanofabrication and Microengineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China

Hydrogen production from water splitting provides an effective method to alleviate the ever-growing global energy *** this work,delafossite CuGaO_(2)(CGO)crystal was synthesized through hydrothermal routes with Cu(NO_(3))_(2)·3H_(2)O and Ga(NO_(3))_(3)·xH_(2)O used as *** addition of cetyltrimethylammonium bromide(CTAB)was found to play an important role in modifying the morphology of CuGaO_(2)(CGO-CTAB).With the addition of CTAB,the morphology of CGO-CTAB samples changed from irregular flake to typical hexagonal sheet microstructure,with an average size of 1-2μm and a thick-ness of around 100 ***,the electrocatalytic activity of CGO-CTAB crystals for oxygen evolution reaction(OER)was also studied and compared with that of CGO ***-CTAB samples exhibited better activity than *** overpotential of 391.5 mV was shown to be able to generate a current density of 10 mA/cm^(2).The as-prepared samples also demonstrate good stability for water oxidation and relatively fast OER kinetics with a Tafel slope of 56.4 mV/*** work highlights the significant role of modification of CTAB surfactants in preparing CGO related crystals,and the introduc-tion of CTAB was found to help to improve their electrocatalytic activity for OER.

关键词： Hydrothermal Water splitting Delafossite CuGaO_(2)(CGO) Electrocatalyst

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Applied in Multilayer Ceramic Capacitors Preparation of B2O3-ZnO-SiO2 Glass and Sintering Densification of Copper Terminal Electrode

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期 960-968页

作者：乐毅李宏曹秀华 ZHANG Xuehui HUANG Jun HUANG Xuye ZHANG Yongqiang XU Ruipeng xiong dehua State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Guangdong Fenghua Advanced Technology Holding Co.Ltd.

B2O3-Zn O-SiO2(BZS) glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper terminal electrode for multilayer ceramic capacitors (MLCC) *** structure and property characterization of B2O3-Zn O-SiO2glass,including X-ray diffraction,FTIR,scanning electron microscopy,high-temperature microscopy,and differential scanning calorimetry,indicated that the addition of CuO improved the glass’s acid resistance and glass-forming *** wettability and acid resistance of this glass were found to be excellent when Cu O content was 1.50 wt%.Compared to BZS glass,the Cu O-added glass exhibited excellent wettability to copper powder and corrosion resistance to the plating *** sintered copper electrode films prepared using the glass with Cu O addition had better densification and lower sintering temperature of 750℃.Further analysis of the sintering mechanism reveals that the flowability and wettability of the glass significantly impact the sintering densification of the copper terminal electrodes.

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中国上市公司多元化与企业绩效分析——基于内生性的考察

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金融研究 2006年第11期 33-43页

作者：洪道麟熊德华北京大学光华管理学院北京100871

本文利用1999～2003年间数据研究了我国上市公司多元化的内生性问题,并在此基础上实证检验了多元化与企业绩效之间的关系。结果显示,企业特征(规模、年龄、成长性、控股股东类型等)、行业特性会对我国上市公司的多元化行为产生重要影响... 详细信息

本文利用1999～2003年间数据研究了我国上市公司多元化的内生性问题,并在此基础上实证检验了多元化与企业绩效之间的关系。结果显示,企业特征(规模、年龄、成长性、控股股东类型等)、行业特性会对我国上市公司的多元化行为产生重要影响,而宏观经济形势的影响并不显著。多元化会损害企业绩效,在控制了内生性问题之后,这种损害会更加严重。

关键词：多元化企业绩效内生性

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公司财务理论与公司财务行为——来自167家中国上市公司的证据

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管理世界 2007年第11期23卷 108-118页

作者：李悦熊德华张峥刘力北京大学光华管理学院

本研究对1507家中国上市公司(A、B、H股)开展一项大型公司财务问卷调查,并基于回收的167份有效问卷,详细研究了返回问卷的样本公司的资本预算、对资本成本的判断、融资行为与资本结构选择等财务行为。本文对样本公司的财务行为进行了报... 详细信息

本研究对1507家中国上市公司(A、B、H股)开展一项大型公司财务问卷调查,并基于回收的167份有效问卷,详细研究了返回问卷的样本公司的资本预算、对资本成本的判断、融资行为与资本结构选择等财务行为。本文对样本公司的财务行为进行了报告和分析,讨论了这些行为与公司特征之间的关系。研究结果表明:这些样本公司的财务行为在一些方面符合公司财务基本原理的描述,但也存在着很多不一致或模糊甚至矛盾之处。这一方面表明在中国特殊的制度和所有权环境中,中国上市公司的财务行为存在着一些较为独特的特征;另一方面也反映出现有公司财务理论还需要进一步发展,以更好地解释公司的现实财务行为。

关键词：资本预算资本成本资本结构问卷研究

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