检索结果-南通市图书馆

Viscosity and structure relationship with equimolar substitution of CaO with MgO in the CaO–MgO–Al_(2)O_(3)–SiO_(2)slag melts

引用

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 70-79页

作者： Yong Hou Shuo Zhang Jie Dang Jia Guo Hanghang Zhou Xuewei Lü College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

Currently,the Al_(2)O_(3)content in the high-alumina slag systems within blast furnaces is generally limited to 16wt%–18.5wt%,making it challenging to overcome this *** most studies that concentrated on managing the MgO/Al_(2)O_(3)ratio or basicity,this paper explored the effect of equimolar substitution of MgO for CaO on the viscosity and structure of a high-alumina CaO-MgO-Al_(2)O_(3)-SiO_(2)slag system,providing theoretical guidance and data to facilitate the application of high-alumina *** results revealed that the viscosity first decreased and then increased with higher MgO substitution,reaching a minimum at 15mol%MgO *** transform infrared spectroscopy(FTIR)results found that the depths of the troughs representing[SiO_(4)]tetrahedra,[AlO_(4)]tetrahedra,and Si-O-Al bending became progressively deeper with increased MgO *** of the Raman spectra showed that the average number of bridging oxygens per Si atom and the X_(Q^(3))/X_(Q^(2))(X_(Q^(i))is the molar fraction of Q^(i) unit,and i is the number of bridging oxygens in a[SiO_(4)]tetrahedral unit)ratio increased from 2.30 and 1.02 to 2.52 and 2.14,respectively,indicating a progressive polymerization of the silicate structure.X-ray photoelectron spectroscopy(XPS)results highlighted that non-bridging oxygen content decreased from 77.97mol% to 63.41mol% with increasing MgO concentration,whereas bridging oxygen and free oxygen contents *** analysis demonstrated a gradual increase in the polymerization degree of the tetrahedral structure with the increase in MgO ***,bond strength is another important factor affecting the slag *** occurrence of a viscosity minimum can be attributed to the complex evolution of bond strengths of non-bridging oxygens generated during depolymerization of the[SiO_(4)]and[AlO_(4)]tetrahedral structures by CaO and MgO.

关键词： aluminosilicate viscosity structure spectroscopy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and electrochemical properties of La, F dual-doped LiLa_(0.01)Mn_(1.99)O_(3.99)F_(0.01) cathode materials

引用

Journal of University of Science and Technology Beijing 2008年第4期15卷 468-473页

作者： Meng Chen Shengjun Li Chuang Yang College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

The cathode materials LiMn2O4 and rare earth elements La-doped or La and F dual-doped spinel lithium manganese *** synthesized by the citric acid-assisted sol-gel method. The synthesized samples were investigated by differential thermal analysis （DTA） and thermogravimetry （TG） measurements, X-ray diffraction （XRD）, scanning electronic microscope （SEM）, cyclic voltammetry （CV）, and charge-discharge test. XRD data shows that all the samples exhibit the same pure spinel phase, and the LiLa0.01Mn1.99O3.99F0.01 and ***.9904 samples have smaller lattice parameters and unit cell volume than LiMn2O4. SEM indicates that LiLa0.01Mn1.99O3.99F0.01 has a slightly smaller particle size and a more regular morphology structure with narrow size distribution. The charge-discharge test reveals that the initial capacities of LiMn2O4, LiLa0.01Mn1.99O4, and LiLa0.01Mn1.99O3.99F0.01 are 129.9, 122.8, and 126.4 mAh·g^-1, and the capacity losses of the initial values after 50 cycles are 14.5%, 7.6%, and 8.0%, respectively The CVs show that the La and F dual-doped spinel displays a better reversibility than LiMn2O4.

关键词： lithium ion battery cathode material LiMn2O4 structure electrochemical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and Properties of Isotactic Polypropylene/Polybutene-1 In-reactor Alloys

引用

Chinese Journal of Polymer Science 2020年第12期38卷 1382-1391页

作者： Ya-Ping Ma Ning Zhang Wei-Ping Zheng Ai-Hua He Chen-Guang Liu Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization Key Laboratory of Rubber Plastis(Ministry of Education)School of Polymer Science and EngineeringQingdao University ofScience and Technology Qingdao 266042China

The composition and structure of polymer largely determine the properties of its final *** a novel polymer material,the composition,structure,and properties of the isotactic polypropylene/polybutene-1 in-reactor alloy(PPIPB alloy)synthesized by sequential two-stage polymerization with Ziegler-Natta catalyst were correlated for the first time in this *** iPP/PB alloy was fractionated by temperature rising elution fractionation(TREF)in a broad temperature ranged from-30℃ to 140℃,and the chain microstructures and sequence distributions of isolated fractions were analyzed by DSC,GPC,13C-NMR,and *** iPP/IPB alloy was composed of five components,namely high isotactic PB(PB,85.8 wt96),medium isotactic PB(mPB,5.1 wt%),polyl(butene-1)-block propylene copolymers(PB-6 PP,4.1 wt%6)which contained PB and PP blocks with dfferent lengths according to the isolation temperature,isotactic PP(iPP,2.7 wt%6),and atactic PB(aPB,2.3 wt96).Compared to other commercial pipe materials,the P/iPB alloy presented outstanding thermal creep resistance and gas permeability resistance,high strength and low deformation at high temperature,and appropriate flexural *** roles of PP and PB-b-PP components in the alloy were *** work is expected to elucidate the potential application of PPIPB aloy as pipe materials and provide solutions for the design and synthesis of high performance pipe materials.

关键词： Polybutene-1 Aloy Block copolymer structure Property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and Properties of Self-reinforced Material Made from Ultra-high Molecular Weight Polyethylene-montmorillonite Nanocomposite

引用

Chemical Research in Chinese Universities 2004年第4期20卷 504-510页

作者： WANGQing-zhao LIAOXian-ling LIUZong-lin SchoolofChemistryandChemicalEngineering ShandongUniversityJinan250100P.R.China SchoolofChemistryandEnvironmentalEngineering ShandongUniversityofScienceandTechnologyJinan250031P.R.China

High-strength and high-modulus ultra-high molecular weight polyethylene(UHMWPE), named self-reinforced material, was obtained by the elongation of UHMWPE-montmorillonite nanocomposite at melting temperature. According to the scanning electron microscope(SEM) analysis, a great deal of fibrillar texture formed in the direction of elongation, and the tensile fractured surface was similar to that of highly oriented fiber. The transmission electron microscope(TEM) and selective area electron diffraction(SAED) analyses reveal that the reinforced phase of the self-reinforced material is an extended chain crystal and its size is about 50_200 nm wide and several microns long, and the montmorillonite layers are broken up to pieces in the size from 100 to 10 nm. The broken layers which have a huge surface area interacting strongly with macromolecules reduces the entanglement density of UHMWPE and induces the chain orientation in flow field. It is supposed that the astriction of montmorillonite layers to polyethylene chains is not only end-tethered but also side-tethered. The differential scan calorimetry(DSC) analysis shows that there are two endothermal peaks for the self-reinforced material, of which the peak at a higher temperature(136.4 ℃) is ascribed to the melting of the reinforced phase.

关键词： Ultra-high molecular weight polyethylene-montmorillonite nanocomposite Elongation Self-reinforced material Properties structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and electrochemical hydrogen storage characteristics of the as-cast and annealed La_(0.8-x)SmxMg_(0.2)Ni_(3.15)Co_(0.2)Al_(0.1)Si_(0.05) (x=0-0.4) alloys

引用

Journal of Rare Earths 2012年第7期30卷 696-704页

作者：李平候忠辉杨泰尚宏伟曲选辉张羊换 School of Materials Science and Engineering University of Science and Technology Beijing Elected State Key Laboratory Inner Mongolia University of Science and Technology

In order to ameliorate the electrochemical cycle stability of the RE-Mg-Ni based A2B7-type electrode alloys, the Mg content in the alloy was reduced and La in the alloy was partially substituted by Sm. The La0.8-xSmxMg0.2Ni3.15Co0.2Al0.1Si0.05 （x=0, 0.1, 0.2, 0.3, 0.4） elec-trode alloys were fabricated by casting and annealing. The microstructures of the as-cast and annealed alloys were characterized by XRD and SEM. The electrochemical hydrogen storage characteristics of the as-cast and annealed alloys were measured. The results revealed that all of the experimental alloys mainly consisted of two phases：（La,Mg）2Ni7 phase with the hexagonal Ce2Ni7-type structure and LaNi5 phase with the hexagonal CaCu5-type structure. As Sm content grew from 0 to 0.4, the discharge capacity and the high rate discharge ability （HRD） first in-creased and then decreased for the as-cast and annealed alloys, whereas the capacity retaining rate （S100） after 100 cycles increased continuously.

关键词： A2B7-type electrode alloy substitution La with Sm structure electrochemical characteristics rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and resistance of concentration polar layer on cation exchange membrane-solution interface

引用

Transactions of Nonferrous Metals Society of China 2006年第6期7卷 1436-1441页

作者：桑商斌黄可龙李晓刚王显 School of Chemistry and Chemical Engineering Central South University

Membrane/solution interface consists of a neutral concentration polai layer(CPL) and a charge layer(CL) under external electrical field, and the neutral CPL can be neglected under high frequency AC electrical field. The relationship of CL thickness e with electrolyte concentration C and fixed ion exchange sites density σ in membrane surface layer can be expressed as e

关键词： ion exchange membrane AC electrical field AC impedance membrane/solution interface structure resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and luminescence of Ca_2Si_5N_8:Eu^(2+) phosphor for warm white light-emitting diodes

引用

Chinese Physics B 2009年第8期18卷 3555-3562页

作者：魏小丹蔡丽艳鲁法春陈小龙陈学元刘泉林 School of Materials Science & Engineering and State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Fujian Institute of Research on the structure of Matter Chinese Academy of Sciences

We have synthesized Ca2Si5N8：Eu^2＋ phosphor through a solid-state reaction and investigated its structural and luminescent properties. Our Rietveld refinement of the crystal structure of Ca1.9Eu0.1Si5N8 reveals that Eu atoms substituting for Ca atoms occupy two crystallographic positions. Between 10 K and 300 K, Ca2Si5N8：Eu^2＋ phosphor shows a broad red emission band centred at -1.97 eV-2.01 eV. The gravity centre of the excitation band is located at 3.0 eV 3.31 eV. The centroid shift of the 5d levels of Eu^2＋ is determined to be -1.17 eV, and the red-shift of the lowest absorption band to be - 0.54 eV due to the crystal field splitting. We have analysed the temperature dependence of PL by using a configuration coordinate model. The Huang-Rhys parameter S = 6.0, the phonon energy hv = 52 meV, and the Stokes shift △S = 0.57 eV are obtained. The emission intensity maximum occurring at -200 K can be explained by a trapping effect. Both photoluminescence （PL） emission intensity and decay time decrease with temperature increasing beyond 200 K due to the non-radiative process.

关键词： luminescence structure nitride europium white light-emitting diode (LED)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure of V_2O_5-P_2O_5-Sb_2O_3-Bi_2O_3 glass

引用

International Journal of Minerals,Metallurgy and Materials 2012年第7期19卷 628-635页

作者： Hong-yan Li Zhi-liang Zhu Feng-li Yang Wei-dong Zhuang Yun-sheng Hu Xiao-fan Wen National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals and Grirem Advanced Materials Co. Ltd. Beijing 100088 China BOE Technology group Co. Ltd. Beijing 100015 China Beijing Asahi Glass Electronics Co. Ltd. Beijing 100015 China

The structure ofV2O5-P2O5-Sb2O3-Bi2O3glass and its state of crystallization were studied by means of infrared spectroscopy and X-ray diffraction analysis. The results indicate that, in this glass, V and P exist mainly in the form of a single-stranded linear （VO3）n and an isolated （PO4） tetrahedral with no double bond. Partial V and P are connected through O, forming an amorphous structure of layered vana- dium phosphate. Trivalent Sb3＋ and Bi3＋ open the V=O bond and appear in interlayers, so a weak three-dimensional structure is connected successfully. Along with the substitution of Sb203 for partial V205 or that of P205 for partial V205, the network structure of the glass is rein- forced, and the crystallization is reduced.

关键词： glass structure sealing vanadium pentoxide phosphorus pentoxide antimonous oxide bismuth trioxide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and high-temperature electrochemical properties of La_(0.60)Nd_(0.15)Mg_(0.25)Ni_(3.3)Si_(0.10) hydrogen storage alloys

引用

Journal of Rare Earths 2011年第6期29卷 574-579页

作者：郭佩佩林玉芳赵海花郭世海赵栋梁 Central Iron & Steel Research Institute

The structure and high-temperature electrochemical properties of the as-cast and annealed （940 °C, 8 h） La0.60Nd0.15Mg0.25Ni3.3Si0.10 hydrogen storage alloys were investigated. The X-ray diffraction revealed that the multiphase structure of the as-cast alloy with LaNi5 phase as the main phase was converted into a double-phase structure with La2Ni7 phase as the main phase after annealing. The surface morphology studied by scanning electronic microscope （SEM） showed that the annealed alloy had a much higher anti-corrosion ability than the as-cast alloy. Both alloys presented excellent activation characteristics at all test temperatures. The maximum discharge capacity of the as-cast alloy decreased when the test temperature increased, while the temperature almost had no effect on the annealed alloy. As the test temperature increased, the cyclic stability and charge retention of both alloys decreased, and these properties were improved significantly by annealing.

关键词： hydrogen storage alloy annealing structure high-temperature electrochemical properties rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

structure and mechanical properties of Zr/TiAlN films prepared by plasma-enhanced magnetron sputtering

引用

Rare Metals 2015年第10期34卷 717-724页

作者： Guang Xian Hai-Bo Zhao Hong-Yuan Fan Hao Du School of Manufacture Science and Engineering Sichuan University The Analysis and Testing Centre Sichuan University

The purpose of this study was to investigate the effects of Zr interlayer on the structure and mechanical properties of TiAlN films, which were deposited on the M2 high-speed steel substrates by means of plasma-enhanced magnetron sputtering. The result shows that the crystal orientation of Zr/TiAlN films is similar to that of single-layered TiAlN films, but the difference is that AlN(111) of Zr/TiAlN films disappears completely. With respect to Zr interlayer, the texture coefficient of Zr/TiAlN films is approximately 1. Zr/TiAlN films exhibit a compact isometric structure, which is distinctly different from the columnar structure existing in the single-layered TiAlN films and Ti/TiAlN films. The hardness and H3/E*2 of Zr/TiAlN films are, respectively, enhanced to be 36.6 GPa and 0.147. With a few cracks emerging around the indention, the adhesion strength of TiAlN films is obviously advanced by adding Zr metal interlayer.

关键词： TiAlN films structure Orientation Hardness Adhesio

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：