共查询到20条相似文献,搜索用时 125 毫秒
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Huang Zhongle 《中国稀土学报(英文版)》1999,(1)
AlargenumberofrareearthorthothiophosphatesREPS4(RE=Pr[1],Sm[2],Nd[3],Y,Gd,Tb,Yb[4])hasbenshowntocrystallizeinthetetragonals... 相似文献
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SynthesisandCrystalStructureofYtterbiumTrichlorideComplexwithProlineMaAi-Zeng(马爱增);LiLai-Ming(李来明);JinSong-Chun(金松春);LinYong-... 相似文献
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CrystalStructureandSpecificRotationofaTetrakis-HistidineOcto-AquoDi-ErbiumPerchlorateComplexYangWeichun(杨维春);ChenDefu(陈德福);Ji... 相似文献
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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。 相似文献
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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。 相似文献
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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. 相似文献
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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. 相似文献
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CrystalStructureandSpectraoftheComplexEu(p-ClC_6H_4COO)_3C_(12)H_8N_2JinLinpei(金林培)(DepartmentofChemistry,BeijingNormalUniversit... 相似文献
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钼粉冶用四钼酸铵晶体的生产 总被引:5,自引:4,他引:1
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。 相似文献
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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. 相似文献
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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. 相似文献
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宋大有 《有色金属材料与工程》1989,(4)
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。 相似文献
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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. 相似文献
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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. 相似文献
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SynthesisandCrystalStructureofSynergisticComplexofTris(1-Phenyl-3-Methyl-4-Trifluoroacetyl-Pyrazolone-5) Mono (Triphenylphosp... 相似文献