微量元素影响C_2S水化活性的研究

本文研究了多种微量元素掺杂对Ｃ２Ｓ水化活性的影响。研究表明，Ｃ２Ｓ水化活性与掺杂离子所形成的Ｃ２Ｓ晶格缺陷、掺杂离子的相互作用、掺杂离子在Ｃ２Ｓ晶格中所形成键的性质等因素密切相关。研究结果得出，多种微量元素同时掺入Ｃ２Ｓ晶格时，对Ｃ２Ｓ水化活性可以是促进，也可以是削弱，其作用规律主要取决于掺杂离子价态及其置换造成的缺陷形式。     

THE FORMATION MECHANISM OF PORTLAND CEMENT CLINKER MINERALS IN RAPID BURNING

Cement clinker is burnt at the rapid heatingrate has the obvious effect of saving energy due tothe low burning temperature and short burning time.This kind of technique is being researched activelyin recent years,but the systemetical theoryinvestigation about the formation mechanism ofclinker minerals under this condition has not beenreported.In this paper,the formation mechanism ofportland cement clinker minerals in rapid burningwas studied by means of DTA,SEM,EPMA,XRDand other conventional testing methods by using aspecial burning equipment.     

免烧粉煤灰建筑陶粒的研制

介绍了用热电厂废渣粉煤灰生产免烧粉煤灰建筑陶粒的研究.提出了利用有关化学物质对粉煤灰的潜水硬性进行激发,并配以一定的其他材料可使粉煤灰制成的球粒在自然养护或低热蒸汽养护下产生强度,代替高耗能烧结法生产建筑陶粒的方法.     

EFFECTS OF DIFFERENT BURNING PROCESSES ON THE FORMATION KINETICS OF CEMENT CLINKER

Two different methods of burning cement clinker, a rapid burning method and an ordinary burning method used in rotary kiln, respectively, were compared in the laboratory. By means of determining fCaO in the clinkers, rule constant Kr and diffusion activation energy Ea in the two processes of clinker formation were calculated by using Ginstling-Brounshtein diffusion equation and Arrhenius equation. The results show that two processes have very different kinetic constants at the same temperature range 1280-1320C. The rate constant Kr at each temperature in the rapid burning process is much greater than that in the ordinary burning process and the former activation energy Ea is much smaller.     

Effect of Minor Elements on Silicate Cement Clinker

The effect of rare-earth and HX addition agent on the burn-ability of silicate cement dinker was investigated by orthogonal experiment. The result shows, compared with blank sample, f CaO of the .samples added with rare-earth and HX agent drops by 84.95% , its 3 d and 28d compressive strength enhances by 24.40% and 16.90% , respectively. It was discovered by means of X-ray diffrnction and high temperature microscope analysis that sintering temperature of the sample added with rare-earth and HX addition agent is about 1320℃. At the same time, the tmrning temperature of triealeium silicate desends and its crystal growth forming- rate increases. Tricalcium silicate content in burning clinker is higher and its crystal is larger.     

Structure and Electrochemical Properties of LiMn_2O_(4-x)F_x

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Activity of reducing steel slag of EAF

Reducing steel slag (RSS) was mainly acquired from five electric-arc furnace (EAF) steelmaking plants (among them, the products of two plants were carbon steel and those of other plants were stainless steel) for research tests. The chemical properties, compound compositions, activities and contents of main expansive compounds were tested. The results showed that the field sampled RSS had a very high crystallinity and hydraulicity with main chemical compositions close to those of Portland cement. It can be known from the study that in case of C/S ratio higher than 2.0, the main compound compositions are C₂S, C₃S, C₂F and f-CaO. However, after the RSS was stored for six months, an obvious variation occurred with potential pre-hydration in RSS, where the SO₃ content was slightly reduced and the compressive activity index was obviously higher than that at the 28th day.     

烧结行为对B4C晶体结构的影响

研究了热压烧结对碳化硼晶体结构的影响，通过以NaCl为内标的XRD慢扫描图谱显示烧结对碳化硼的结构有一定的影响，烧结前碳化硼粉末的晶格常数为α=0．56868nm，c=1．18398nm；烧结后晶格常数为α=0．56082nm，c=1．20302nm．     

L i F e 1-yMg yP O4的制备及电化学性能研究

采用机械活化一步固相法, 在F e位掺杂 Mg 2+ 合成了结晶度较好的 L i F e 1-yMg yP O4。采用 XR D、S EM 等方法对L i F e 1-yMg yP O4的结构和形貌进行了表征, 利用恒电流充放电法研究了 Mg 2+ 掺杂对 L i F e 1-yMg yP O4电化学性能的影响。结果表明, 适量 Mg 2+掺杂不改变L i F e P O4的晶体结构, 同时可以细化颗粒粒径, 增强导电性和可逆性, 有效地提高L i F e P O4的倍率性能和循环稳定性。L i F e 0. 9 9Mg 0. 0 1P O4在0. 1C和1C倍率条件下首次放电比容量分别为1 5 8. 7mA h / g和1 4 1. 9mA h / g, 循环5 0次后放电比容量几乎没有衰减。     

丙酮溶剂化(2-氨基吡啶)(5,10,15,20-四苯基)卟啉镉(Ⅱ)的合成、晶体结构及光学性质

合成了标题化合物丙酮溶剂化(2-氨基吡啶)(5,10,15,20-四苯基)卟啉镉(II)[Cd(TPP)(C5H6N2)]·CH3OCH3,并用X-射线衍射法测定了其晶体结构,该化合物属于三斜晶系,P-1空间群,晶胞参数为a=1.133 1(2)nm,b=1.327 5(3)nm,c=1.516 0(3)nm,Z=2,Dc=1.358 g.cm-3,μ=0.555 mm-1,F(000)=900,最终结构偏离因子R=0.038 7,Rw=0.099 8,S=1.084。通过红外光谱(IR)、紫外-可见光谱(UV-Vis)对化合物的光学性质进行了表征。     

Study on the structural characteristics of graphitized carbon microcrystal prepared from PI film using X-ray diffraction technique

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Crystal Structure of 3-Allyl-5,5-Dimethylhydantoin

In this paper single crystals of 3-allyl-5,5-dimethylhydantoin (ADMH) have successfully extracted through recrystallization from a mixture solvents of dichloromethane and petroleum ether. By using single-crystal X-ray diffraction technique, its crystal structure has been determined to belong to monoclinic system, with space group P2(1)/n, a0.599?53(12), b0.983?7(2), c1.529?0(3)?nm, β100.43(3)°, V0.886?9(3)?nm 3, Z4, D_c1.260?g/cm³, F(000)360, μ(MoK_α)0.092?mm^-1, M_r168.20, R0.042?2 and wR0.108?5 for 1?755 observed reflections (I>2σ(I)). Also, its chemical formula has been confirmed as C₈H₁₂N₂O₂. Results of crystal structures determination for the compound show that the bond of N(1)-C(2) has a double-bond characteristic and there are intermolecular hydrogen bonds. This crystal exists in the form of dimers, in which the two constituent ADMH molecules build into an H-bond-centered symmetric pattern.     

介观TiO2晶体材料的拓扑转变合成及其性能

以层状结构的钛酸盐HTO（H_4x/3Ti_2-x/3□ _x/3O₄?nH₂O）为原料,采用水热的方法合成了金红石型介观TiO₂晶体。通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）等测试手段,研究了反应温度对利用拓扑结构转变方式合成的金红石型介观TiO₂晶体材料的影响。结果表明,金红石型TiO₂晶体材料可以在反应体系pH为0.5的条件下得到,当反应温度升高到120 ℃时,形成了金红石型介观TiO₂晶体材料。以罗丹明B（RhB）为污染物模型进行了降解实验。结果表明,120 ℃时金红石型介观TiO₂晶体材料的光催化活性明显高于其他样品,主要是由于介观晶体具有较为特殊的电子传导特性,有助于电子与空穴的分离。染料敏化太阳能电池（DSSCs）实验结果表明,120 ℃时所形成的介观晶体结构有助于光生载流子的快速迁移,从而获得较高的电池特性。     

二乙基二硫代氨基甲酸铁的溶剂热合成、晶体结构及电化学性质

溶剂热法合成了二乙基二硫代氨基甲酸铁配合物[(C5H10NS2)3Fe(III)],并用X射线衍射法测定了其晶体结构。该化合物属于单斜晶系,C2/c空间群,晶胞参数为a=1.425 2(3)nm,b=1.039 5(2)nm,c=1.719 2(3)nm,z=4,Dc=1.404 g.cm-3,μ=1.170 mm-1,F(000)=1 052,最终结构偏离因子R=0.049 1,wR=0.121 7,S=1.036。循环伏安研究表明该化合物具有电化学活性。     

稀土氧化物对刚玉系高温自润滑材料组织结构与性能的影响

利用XRD、SEM、AFM等系统研究了Y2O3对刚玉系高温自润滑材料组织结构与性能的影响.结果表明：Y2O3可改善和优化其组织结构,起到细化晶粒,促进致密化作用,可有效提高材料高温摩擦状态下强度、韧性和蠕变能力,促进表层结构的有利转变,形成纳米结构层,出现流体动力润滑,使摩擦磨损进一步降低,呈现出良好的高温自润滑性.     

Nd，Yb：YAG晶体生长及性能表征

采用中频感应加热提拉法,生长Nd,Yb：YAG激光晶体．利用XRD、吸收光谱和荧光光谱对晶体的物相结构及光谱性能进行分析,结果表明：Nd,Yb：YAG晶体属于立方晶系,晶格参数a=1．2021nm,在808nm处有较强的吸收能力．室温下,Nd,Yb：YAG晶体荧光光谱的最强荧光发射峰位于1030nm处,归属于Yb^3＋离子的^2F5/2-^2F1／2能级跃迁．     

Molecular Structure of Aminoguanidine Sulfate Monohydrate

Aminoguanidine(guanylhydrazine)is an i mpor-tant chemical material,and is widely used inmedicines,pesticides,explosive,vesicant and finechemicals.Its molecule is rich in nitrogen and con-sists of a hydrazine group,an i mino group and anamino group,which determine its lively chemical re-activity.This compound is interesting in the sensethat it has apparently a lowtoxicity level,and func-tions as aninhibitor of the Maillard reaction.The re-action between nitrile groups of acrylonitrile/vinyl ac-…     

Preparation and Properties of CdTe Polycrystalline Films for Solar Cells

The structure and characteristics of CdTe thin filrns are closely dependent on the whole deposition process in close-space sublimation （CSS）. The physical mechanism of CSS was analyzed aud the temperature distribution in CSS system was measured, and the influences of the increasing-temperature process and pressure on the preliminary nucleus creation were studied. The resuits indicate ： tire samples deposited at different pressures hare a cubical structure of CdTe and the diffraction peaks of CdS and SnO2 ： F. As the atmosphere pressure increases, the crystal size of CdTe decreases, the rate of the transparency of the thin film decreases and the absorption side moves towards the short-wave direction. After a 4-minute depositing process with a substrate teraw.rature of 500℃ and a source temperature of 620 ℃, the polycostallinc thin films can be mmade , so the production of high-quality integrated cell with StrO2： F/ CdS/ CdTe/ Au structure is hopeful.     

利用理论与实验结合确定WB2的晶体结构

过渡金属硼化物一直作为多功能硬质材料被广泛应用于工业生产中,但目前尚有一些材料的晶体结构受到争议。这些材料利用常规的测试方法（XRD、EDS等） 不能对其进行区分,需要利用复杂且昂贵的测试手段来确定。合成纯相的材料也是一个难题,这对样品晶体结构的确定带来了更大的麻烦。利用高温高压法合成了曾经具有争议晶体结构的WB₂。利用理论和实验相结合的方法确定了其晶体结构为WB₂而不是W₂B₅。 此种方法对确定具有争议晶体结构材料的晶体结构具有重要的指导意义。     

取向膜表面方位锚定强度对铁电液晶分子排列的影响

计算分析铁电液晶C1和C2排列态的自由能．在取向膜预倾角较低的条件下，当取向膜表面方位锚定强度大于临界值2．1×10^-6J／m2时，C2排列态的自由能低于C1排列态，可实现均匀的C2排列态，并进行实验证明．采用摩擦取向方法，制作出了均匀取向的表面稳定模式器件．