Microstructural Probing of (1-x) GeS_(2-x)Ga_2S_3 System Glasses By Raman Scattering

1IntroductionFiber amplifiers are of technological interest for ap-plications in optical communications systems.Attentionshas been paidtothe chalcogenide glasses because of theirlower phonon energy and higher quantumefficiency[1-4].Galliumis an essential …     

Solvothermal Synthesis and Photocatalytic Performance of Bi_2S_3 Hierarchical Nanostructure

The synthesis of Bi_2S_3 hierarchical nanostructure was reported by a solvothermal reaction using ethylene disulfhydrate as the sulfur source and chelating reagent. The as-synthesized samples were characterized by X-ray diffraction(XRD), Raman, X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM) and photoluminescence(PL). The XRD, Raman, and XPS data confirmed that the as-synthesized sample belongs to orthorhombic phase Bi_2S_3. The SEM observations displayed that Bi_2S_3 hierarchical nanostructure assembled from nanorods. A 410 nm ultraviolet photoluminescence(PL) emission of as-synthesized Bi_2S_3 was observed when the sample was excited with wavelength of 320-330 nm. The Bi_2S_3 hierarchical nanostructure also shows a significant enhancement of photocatalytic capability toward degrading methyl orange(MO) under UV light, the photodegradation of MO reaches 95% within 180 min.     

S-紧性与S-分离性

在S-紧空间中讨论了几个S-分离空间之间的关系,给出了S_2-空间成为S_3*-空间,S_3*-空间成为S_4*-空间的一个充分条件。主要结论:设X是-S紧空间,且具有有限半开集可交性,则(1)若是S_2-空间,则X是S_3*-空间;(2)若是S_2-空间,则X是S_4*-空间;(3)若是S_3*-空间,则X是S_4*-空间。     

湿法浸出硫化矿的理论依据

硫化矿如ZnS,Bi_2S_3,PbS等在火法冶炼中由于不同程度对环境的污染,因此迫使人们对其湿法处理开展了研究。湿法处理硫化矿从量子化学观点来看是在破坏金属原子与硫原子之间的键能。在各种硫化矿中,金属与硫之间的键能是各不相同的,因此浸出情况也就不同,凡是键能和极性键大的,则不易被浸出,反之则较易。本文从计算金属原子与硫原子的重迭积分入手计算各种硫化矿的键能,再考虑到极化情况,得到它们的键能大小次序为:ZnS>CoS>NiS>Sb_2S_3>CuS>Ag_2S>Bi_2S_3>PbS 上述次序表明ZnS不易被浸出,PbS则相反,计算情况与实际情况基本是一致的。     

贵州普定灯盏河岩溶泉的硫同位素季节变化特征

通过对贵州普定后寨地下河补给区的灯盏河岩溶泉为期1年的泉水水文地球化学特征与水中SO24-的硫同位素组成及季节性变化规律的分析,揭示灯盏河岩溶泉泉水中硫酸盐的来源及形成机理。结果表明：灯盏河岩溶泉的水化学类型主要为HCO3-.SO24--Ca2＋型,具有很高的硫酸盐浓度,且变化幅度较大,SO24-浓度为0.35～8.76mmol·L-1;灯盏河泉水SO24-的硫同位素组成为（3.80～25.76）×10-3,反映泉水的硫同位素组成主要受土壤有机硫氧化和石膏岩层溶解的控制;泉水硫同位素组成季节性变化明显,表现为旱季大于雨季,且旱季变化平缓,主要受石膏溶解的控制,而雨季变化幅度较大,反映雨季地下水硫酸盐土壤有机硫源贡献的增加及其季节性差异。     

西斜坡区萨二、三油层油气运移优势路径及对成藏的作用

分析了西斜坡区萨二、三油层油气运移输导通道的构成及特征,认为砂体是该输导层的主要通道,断裂只起油气转向、汇聚和沟通作用.根据油气运移和优势路径选取原理,在古埋深恢复的基础上,确定了西斜坡区萨二、三油层油气运移3条优势路径:齐家—古龙凹陷经白音诺勒至二站、阿拉新、平洋;齐家—古龙凹陷沿滨州铁路至富拉尔基;齐家—古龙凹陷经巴彦查干至泰来.研究了油气运移优势路径与油气藏分布之间的关系,该区萨二、三油层油气运移优势路径控制着油气藏的分布,只有位于油气运移优势路径上的圈闭才是该区萨二、三油层油气聚集成藏的有利场所.     

Properties and Microstructure of GeS2-Ga2S3-CdS Glasses

The samples of the GeS2-Ga2 S3-CdS pseudo-ternary glassy sysem were prepared by comventional melt-quenching techniques.The microstructure of the GeS2-Ca2 S3-CdS glasses was analyzed thoroughly using Raman spectra and the relationships among the composition,microstructure and properties（such as thermal properties,densities,optical properties）were probed.The experimental results indicate that the GeS2 acts as the network former,the Ga2S3 as the net intermediate,and the CdS as the net modifier,The GeS2 and Ga2S3 exist in the form of [GeS4/2],[GaS4/2]tetrahedra or S3G3（Ga）-（Ga）GeS3 ethane-like units within the glassy network,and the addition of CdS mainly breaks the Ge（Ga）-（Ga）Ge bonds among the ethane -like units,leading to the formation of [GeS4/2].[GaS4/2]tetrahedra.The Tg and Tx have tight relations on the congregated degree of glassy network,however,λvis,n and d are hardly involved into the connectional dependence of the space arrangement.     

不同硫源对锂离子电池负极材料Sb2S3的影响

以酒石酸锑钾为原料,硫代硫酸钠、硫脲为硫源,通过水热反应制备不同形貌的硫化锑(Sb_2S_3)。采用XRD、SEM、EDS、循环伏安(CV)和恒流充放电等测试手段,探讨不同硫源对Sb_2S_3的形貌和电化学性能的影响。结果表明:不同的硫源对Sb_2S_3的形貌结构有较大影响,以硫代硫酸钠为硫源时,形成的Sb_2S_3以粗的棒状结构为主;以硫脲为硫源时,形成的Sb_2S_3以细的棒状结构为主。在0.1C的电流密度下,以硫代硫酸钠合成的Sb_2S_3样品的电化学性能更好,其最大的放电比容量可达618.6 m A·h/g。     

Preparation and Characterization of CeO2-TiO2/SnO2：Sb Films Deposited on Glass Substrates by R.F. Sputtering

CeO2-TiO2 films and CeO2-TiO2/SnO2:Sb(6 mol%)double films were deposited on glass substrates by radio-frequency magnetron sputtering(R.F.Sputtering),using SnO2:Sb(6 mol%)target,and CeO2-TiO2 targets with different molar ratio of CeO2 to TiO2 (CeO2:TiO2=0:1.0;0.1:0.9;0.2:0.8;0.3:0.7;0.4:0.6;0.5:0.5;0.6:0.4; 0.7:0.3; 0.8:0.2;0.9:0.1;1.0:0).The films are characterized by UV-visible transmission and infrared reflection spectra,scanning electron microscopy(SEM),Raman spectroscopy,X-ray photoelectron spectroscopy(XPS)and X-ray diffraction(XRD),respectively.The obtained results show that the amorphous phases composed of CeO2-TiO2 play an important role in absorbing UV, there are Ce3+,Ce4+ and Ti4+ on the surface of the films;the glass substrates coated with CeO2-TiO2(Ce/Ti=0.5:0.5;0.6:0.4)/SnO2:Sb(6 mol%) double films show high absorbing UV(>99),high visible light transmission(75%)and good infrared reflection films can be used as window glass of buildings,automobile and so on.     

微波辅助H2O2-CH3COOH—DMF

以H2O2-CH3COOH为氧化剂,N,N-二甲基甲酰胺为萃取剂,在微波作用下对柴油进行脱硫实验。结果表明,在复合溶剂用量为理论用量的12倍,剂油体积比为0．25：1,辐射压力为0．4MPa、恒压辐射时间为6min,辐射功率375W,萃取剂与油体积比为1：1,静置时间为10min条件下,油品的脱硫率达到88．2％。与其它氧化脱硫法相比,脱硫率提高26％～42％,氧化剂用量减少20％～50％。     

改性分子筛吸附脱除液态烃中的二甲基二硫醚

采用浸渍法制备改性分子筛,并用XRD、BET技术对其结构进行表征。采用间歇静态吸附法和连续动态吸附法考察吸附剂在模拟液态烃中对二甲基二硫醚的脱除性能。结果表明：4A分子筛复载金属离子后脱硫效果顺序为4A〈Cu4A〈C04A〈Ag4A〈AgC04A,复配型AgC04A分子筛吸附剂在相同条件下脱硫效果最佳。当Ag’离子交换浓度为0．1mol／L时制备的复配型AgC04A分子筛具有最好的脱硫性能,在间歇静态脱硫实验中剂油比为O．02g／ml、吸附时间为1h即可达到吸附平衡,其饱和吸附硫容为3．76mgS／g,脱硫率高达95．74％;连续动态吸附实验中液态烃空速为0．5h。时可达到最佳吸附状态,脱硫率高达97．95％,饱和吸附硫容为5．71mgS／g。吸附剂具有良好的稳定性和再生性,再生后的静态吸附脱硫率可达93．95％。     

NaxSr1-2xMoO4∶Eux^3＋的制备及其发光性能的研究

采用高温固相法结合电荷补偿方式2Sr2＋→Eu3＋＋Na＋,合成了适合白光LED的红色荧光材料NaxSr1-2xMoO4∶Eux^3＋（x=0.1、0.15、0.2,0.25、0.3）系列样品.对样品分别进行了X射线衍射（XRD）分析和荧光光谱的测定.测试结果表明,NaxSr1-2xMoO4∶Eu3x＋荧光粉可以被近紫外光（UV）（393 nm）和蓝光（463 nm）有效激发.通过探讨Na＋和Eu3＋的掺杂浓度对发光强度的影响,得出NaxSr1-2xMoO4∶Eux3＋系列样品的发光强度比SrMoO4：Eu3＋明显增加,且当掺杂量x=0.2时,NaxSr1-2xMoO4∶Eux3＋系列样品在616 nm处的发光强度最大.分析了NaxSr1-2xMoO4∶Eux3＋系列样品在380 nm紫外光激发下的色坐标,当Na＋和Eu3＋的掺杂量x=0.15时,样品的红色显色最强.     

高岭土掺杂NASICON固体电解质及全固态电池性能

针对LiTi2(PO4)3基固态电解质电导率低的问题,采用浙江三门高岭土矿作为主要原料,以高温固相法制备铝、镁、硅共掺杂钠超离子导体(NASICON)型快离子导体Li1+2x+2yAlxMgyTi2-x-ySixP3-xO12.研究掺杂比例、温度对固态电解质离子电导率的影响.结果表明,组成为Li1.8Al0.1Mg0.3Ti1.6Si0.1P2.9O12固体电解质在423 K时有最高离子电导率7.86×10-4 S·cm-1.以该组成固态电解质为基片,喷雾热解原位制备Al/ Li1+xV3O8/ Li1.8Al0.1Mg0.3Ti1.6Si0.1 P2.9O12 /C全固态电池并在1.8～3.9 V电压区间进行50次充放电测试.该电池具有较好的稳定性及循环容量保持能力.30次循环以后放电容量基本稳定在190～205 mAh·g-1之间,充放电效率大于90%.     

复合隐身用超细粉体材料的制备工艺研究

以钛酸丁酯、醋酸钡、无水乙醇和冰醋酸为原料,通过溶胶-凝胶法制备了Ti/Ba比为1:1的纳米Ba-TiO3粉体;以分析纯In2O3和自制SnO2为原料,通过高温固相法制备ITO颜料粉末。采用多种胶粘剂,将纳米吸波剂BaTiO3粉体与ITO颜料粉末经超声分散后复合到玻璃基片上获得复合涂层样品。对粉体材料和涂层样品的工艺影响因素进行了系统研究。     

Preparation and characterization of LiAlxMn2-xO4 for a supercapacitor in aqueous electrolyte

LiAlxMn2-xO4(0≤x≤0.5) was synthesized by high temperature solid-state reaction. The structure and morphology of LiAlxMn2-xO4 were investigated by X-ray diffraction and scanning electron microscopy(SEM) . The results indicate that all samples show spinel phase. The polyhedral particles turn to club-shaped,then change to small spherical,and finally become agglomerates with increasing Al content. The supercapacitive performances of LiAlxMn2-xO4 were studied by means of galvanostatic charge-discharge,cyclic vol...     

锑氧化矿或硫氧混合矿的真空处理研究

本文对锑氧化矿或硫氧混合矿的真空处理问题进行了初步研究.着重研究了真空处理过程涉及到的四氧化二锑和三硫化二锑之间的交互反应规律以及用硫化亚铁作硫化剂时四氧化二锑的硫化挥发规律.试验结果表明:影响交互反应过程和硫化挥发过程的主要因素是试料中三硫化二锑或硫化亚铁的含量,过程温度,反应气氛以及二氧化硅的存在与否及其量的多少.采用真空处理法,可在较低温度下使锑以很高的挥发率和挥发速率呈低价氧化物的形式从矿石中挥发出来.     

Thermal expansion properties and hygroscopicity of Y2-xSmxW3O12 (x = 0.0-0.4) compounds

A novel class of solid solutions of Y2-xSmxW3O12 (x = 0.0-0.4) were synthesized and studied by means of powder X-ray diffraction. All samples crystallize in an orthorhombic space group Pnca. The lattice parameters a, b and c of Y2-xSmxW3O12 increase with increasing Sm content. Since the compounds of this series hydrate at room temperature, thermogravimetric (TG) analysis was carried out. The result shows that the compound stores less water with increasing Sm content. The thermal expansion properties of Y2-xSmxW3O12 (x = 0.1, 0.3 and 0.4) were investigated with high temperature X-ray diffraction. Negative thermal expansion coefficient -α becomes less negative from -6.644×10-6 to -6.211×10-6℃-1 when x changes from 0.1 to 0.4.     

关于23S1介子九重态中同位旋二重态的质量

借助对于接近理想混合的介子九重态,味道有关的夸克偶素间的湮灭效应可以忽略这样一个假定,利用在介子、介子混合框架下导出的质量关系,预言23S1介子九重态中同位旋二重态的质量大约为1584±16.7 MeV,该结果与相对论性的夸克模型给出的预言符合很好.理论预言与K*(1410)的质量之间的比较,显示把K*(1410)安排为23S1介子九重态的成员是不合适的.该理论预言将会对实验上寻找23S1介子九重态中的同位旋二重态提供一些帮助.     

Magnetism Regulation of (In_(1-x)Fe_x)_2O_3 Semiconductors Prepared by Sol-gel Method

Fe doped In2O3 samples (In1-xFex)2O3 (x=0, 0.05, 0.1, 0.2 and 0.3) on glass substrate were prepared by sol-gel method. The XRD results demonstrate that the solubility of Fe ions in In2O3 matrix is around 20%, above which impurity phase can be observed. The transmittance of the samples with x=0, 0.05, 0.1 and 0.2 are above 80% in the visible region while the transimittance of the glass is 90%. The transmittance curves slightly red-shifts as x increasing. All of the samples except x=0 are ferromagnetic at roo...     

超声作用下有机酸体系柴油深度氧化脱硫

在超声波的作用下,用H2O2-CH3COOH-FeSO4体系将柴油中的含硫有机物(主要为苯并噻吩类)氧化成相应的砜,用N,N-二甲基甲酰胺(DMF)作萃取剂将砜从柴油中萃取除去。考察了剂油体积比、氧化剂的质量分数、反应时间、超声声强等因素对柴油脱硫的影响。实验结果表明,在H2O2和油的体积比为0.024,CH3COOH和H2O2的体积比为0.5,FeSO4和H2O2的质量比为0.2,声强为0.3 W/cm2,反应时间为10 min的条件下,可使柴油脱硫率达到88.3%,收率可达92%以上。