结晶器内嵌套对连铸方坯凝固组织的影响

通过方坯结晶器上端内嵌石墨套改变结晶器内凝固坯壳层界面前沿的温度梯度，研究了给定的浇注温度下嵌石墨套对连铸坯凝固组织变化的影响。嵌石墨套结晶器显著改变其凝固壳前端钢液的温度分布，有效地抑制铸坯柱状晶的生长，扩大等轴晶区，减轻凝固偏析。     

Preparation and Structural Chemistry of a Series of Rare Earth Compounds REPS 4

ＡｌａｒｇｅｎｕｍｂｅｒｏｆｒａｒｅｅａｒｔｈｏｒｔｈｏｔｈｉｏｐｈｏｓｐｈａｔｅｓＲＥＰＳ４（ＲＥ＝Ｐｒ［１］,Ｓｍ［２］,Ｎｄ［３］,Ｙ,Ｇｄ,Ｔｂ,Ｙｂ［４］）ｈａｓｂｅｎｓｈｏｗｎｔｏｃｒｙｓｔａｌｌｉｚｅｉｎｔｈｅｔｅｔｒａｇｏｎａｌｓ...     

Synthesis and Crystal Structure of Ytterbium Trichloride Complex with Proline

ＳｙｎｔｈｅｓｉｓａｎｄＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＹｔｔｅｒｂｉｕｍＴｒｉｃｈｌｏｒｉｄｅＣｏｍｐｌｅｘｗｉｔｈＰｒｏｌｉｎｅＭａＡｉ－Ｚｅｎｇ（马爱增）；ＬｉＬａｉ－Ｍｉｎｇ（李来明）；ＪｉｎＳｏｎｇ－Ｃｈｕｎ（金松春）；ＬｉｎＹｏｎｇ－...     

Crystal Structure and Specific Rotation of a Tetrakis－HistidineOcto－Aquo Di－Erbium Perchlorate Complex

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅａｎｄＳｐｅｃｉｆｉｃＲｏｔａｔｉｏｎｏｆａＴｅｔｒａｋｉｓ－ＨｉｓｔｉｄｉｎｅＯｃｔｏ－ＡｑｕｏＤｉ－ＥｒｂｉｕｍＰｅｒｃｈｌｏｒａｔｅＣｏｍｐｌｅｘＹａｎｇＷｅｉｃｈｕｎ（杨维春）；ＣｈｅｎＤｅｆｕ（陈德福）；Ｊｉ...     

Ⅲ-Ⅴ族化合物半导体单晶材料发展动态

介绍了Ⅲ Ⅴ族化合物单晶生长工艺包括LEC、VCZ、VGF/VB、HB的发展现状 ;欲生长大直径、高质量单晶 ,仍须对热传输和化学计量等问题进行深入研究。目前 ,全世界Ⅲ Ⅴ族半导体单晶产量约 80t,产值约 5亿美元。     

Cu-Si 二元系中 k 相和η相的晶体结构分析

对Cu Si二元系中的k相和 η相进行了X射线衍射分析。k相属于镁型六方晶系 ,晶格点阵参数为a =b=0 .2 5 6 1nm、c =0 .4184nm、α =β =90°、γ =12 0° ,k相不稳定 ,在室温下长期放置会部分地转变成γ Cu5Si;η相属于正交晶系 ,晶格点阵参数为a =0 .6 0 41nm、b=0 .6 35 6nm、c=0 .42 88nm ,Cu3Si合金分别在 46 7、5 5 8、5 70和 6 2 0℃时发生相变。     

Crystal and Molecular Structure of Triboluminescent Complex Eu(NO_3)(TTA)_2(TPPO)_2

Eu(NO_3)(TTA)_2(TPPO)_2 (TTA=thenoyltrifluoroacetone,TPPO=triphenylphosphine oxide),M=1212.90,triclinic P1,a=1.1081(2)nm,b=1.1857(2)nm,c=1.2580(2)nm,α=65.54(1)°,β=77.91(1)°,γ=61.99(1)°;Z=1,V=1.3281(4)nm~3,D_c=1.47g/cm~3,μ_(MoK_α)=14.1 cm~(-1).The crystal desplaystriboluminescence upon fracture.Structure study shows that the crystal is noncentrosymmetric and no disor-der is found.It is concluded that the polarity of crystals is necessary for the observation of triboluminescence.     

直接淬火硬化钢晶粒度腐蚀剂的选用

就38CrMoAl、20CrMnTi两种钢的几种试验分析并总结出比较快速准确显示直接淬火硬化钢晶粒的腐蚀剂。     

Synthesis and Crystal Structure of a Novel Ion-pair Complex of [Li(THF)_4Nd(C_8H_8)_2]·2THF

The reaction of NdCl_3 with lithium methylnaphthalene in 1:2 mole ratio in THF generates black powder.The powder reacts with cyclooctatetraene(COT)in THF to form the title complex.[Li(THF)_4Nd(C_8H_8)_2]·2THF crystallizes in the monoclinic space group P2/c with unit-cell dimensions a=1.7858(7)nm,h=1.3243(4)nm,c=1.8086(6)nm.β=106.52(4)°,V=4.10 nm~3 and D_c=1.268 g/cm~3 for Z=4.F(000)=1660,R=0.0774,R_n=0.0733.The complex consists of discrete ion-pair and two THF moleculesadduct.In the anion,the neodymium atom is coordinated by two COT rings.The structure of the cation showsthat the lithium atom is attached with THF molecules only.     

Crystal Structure and Spectra of the Complex Eu(p-ClC_6H_4COO)_3C_(12)H_8N_2

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅａｎｄＳｐｅｃｔｒａｏｆｔｈｅＣｏｍｐｌｅｘＥｕ（ｐ－ＣｌＣ_６Ｈ_４ＣＯＯ）_３Ｃ_（１２）Ｈ_８Ｎ_２ＪｉｎＬｉｎｐｅｉ（金林培）（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＢｅｉｊｉｎｇＮｏｒｍａｌＵｎｉｖｅｒｓｉｔ...     

钼粉冶用四钼酸铵晶体的生产

依据钼盐的络合物化学和碱性钼酸钕滴定的结果,研究了四钼酸铵的酸沉反应式及其酸量计算方程式,依据晶体结构、性能与粒度控制为目标。对结晶阶段的酸量和钾量控制以及洗涤、干燥阶段的工艺操作进行了研究。结果表明,钼粉冶用四钼酸铵的结构、性能和粒度不仅直接依赖于结晶阶段的酸量、钾量等工艺参数的控制,而且间接依赖于下游工序,包括洗涤和干燥阶段的工艺参数等的控制。     

Crystal Structure of{[(μ_2-Cl)(C_5H_5)Sm(μ_2-Cl)]_2(μ_3-Cl)(μ_4-O)Sm(μ_2-Cl)·THF}_2~(2-)·[Li(DME)_2·Li(THF)_2·DME]~(2 )·DME

The crystal structure of title complex has been determined by the method of X-ray single crystaldiffraction.The crystal belongs to monoclinic space group C_(2/c)with the unit parameters a=2.8907(7),b=2.0431(5),c=1.5723(3)nm;β=115.67(2)°.The unit volume V is 8.36924(348)nm~3;Z=8,Dc=1,82g·cm~(-3),μ(MoK_α)=46.4cn~(-1); F(000)=4416.The final R is 0.083,Rw 0.088.The title complex con-sists of two univalent cations and one divalent anion.The anion has a cluster structure including six Sm~(3 ).Coordination numbers of all six Sm~(3 )are eight,but their surroundings are different from each other.Two ofthem are decahedral array,and the others are octahedral array f the centroid of each pentacyclodienyl ring istaken as one point.     

四钼酸铵的晶体结构对钼加工性能的影响

对四钼酸铵的晶体结构及其加工性能进行了分析 ,指出 :晶体形貌呈球形的α型四钼酸铵和呈针棒形的 β型四钼酸铵不适合焙解还原一次完成的转炉生产 ,而且加工性能差 ;晶体形貌呈平行四边形长方体 (2 0 %α 80 % β)型四钼酸铵适合焙解还原一次完成的转炉生产 ,而且加工性能优良。     

世界半导体硅工业新动向

文章从技术和市场两方面概括了近年来世界半导体硅工业的新动向。评述了单晶中的氧行为,CLF-CZ、FCCZ、MCZ等方法的应用,分析了硅工业的发展方向与国际市场的变化。     

The Syntheses,Characterization and Crystal Structure of Extraction Complexes of Rare Earths

The syntheses,characterization and crystal structure of rare earth coordination compounds of five typicalextraction systems commonly used in the separation technology were reported.They are:(1)carboxylic acidsystem,(2)organophosphorous acid system,(3)quarternary ammonium salt system,(4)neutralorganophosphonate system and(5)synergistic system.     

Synthesis,Characterization and Crystal Structure of Ln(CCl_3COO)_3·(phen)_2·2H_2O

Coordination compounds of lanthanide trichloroacetates with 1,10-phenanthroline weresynthesized and characterized as Ln(CCl_3COO)_3·(phen)_2·2H_2O(phen=1,10-phenanthroline,Ln=Tb～Lu)by chemical analysis,IR spectra,thermal analysis and crystal X-ray structural analysis.The crystal ofEr(CCl_3COO)_3·(phen)_2·2H_2O belongs to monoclinic system,with space group P2_1/c,a=1.6969(6)nm,b=1.3776(5)nm,c=1.7563(9)nm,β=114.79(9)°,V=3.727(1)nm~3,Z=4.     

硒(IV)-KI-结晶紫显色体系的研究

对硒（Ⅳ）－ＫＩ－结晶紫显色体系进行了较系统的研究,确定了最佳显色条件。该体系在０－２０ｕｇ／２５ｍｌ范围内服从比尔定律。摩尔吸光系数ε＝２．０ｘ１０５．测定了中草药黄芪及矿泉水中硒的含量与加标回收率。结果满意。     

有色金属的晶体缺陷

本文概述了有色金属中各种晶体缺陷的特征、形成、运动和观察方法，还阐述了晶体缺陷对有色金属的原子扩散、塑性变形、相变、热处理性能的影响。     

Crystal Structure and Characterization of Neodymium Phenylacetate Hydrate

The crystal structure of Nd(ph-CH_2COO)_3H_2O has been determined by X-ray diffraction technique.Thecrystal behmgs to orthorhombic system with space group P_(na)2_1,cell parameters a=0.7983(1)nm,h=1.3957(1)nm,c=2.0282(2)nm;V=2.2598(15)nm~3,Z=4.The Mechanism and enthalpy changes ofthermal decomposition reaction of the title complex have been studied by TG-DTG-DTA and DSC.     

Synthesis and Crystal Structure of Synergistic Complex of Tris（1－Phenyl－3－Methyl－4－Trifluoroacetyl－Pyrazolone－5） Mono （TriphenylphosphineOxide） Scandium

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