二羟乙基二硫代氨基甲酸铋配合物的合成、晶体结构及杀菌活性

二硫代氨基甲酸盐;二羟乙基二硫代氨基甲酸铋配合物的合成、晶体结构及杀菌活性     

硫酸铵-碘化钾-乙醇体系萃取分离铋

1　引言利用高聚物水溶液在无机盐存在下可以分成两相的非有机溶剂萃取分离方法已引起人们的重视[1 ,2 ] 。本文研究发现 ,在硫酸铵存在下 ,乙醇与水分相过程中 ,Ｂｉ(Ⅲ )与Ｉ- 形成的ＢｉＩ3-6 络阴离子能被乙醇相定量萃取 ,控制一定的酸度 ,可以实现Ｂｉ(Ⅲ )与Ｆｅ(Ⅲ )、Ｃｏ(Ⅱ )、Ｍｎ(Ⅱ )、Ｃｕ(Ⅱ )、Ｎｉ(Ⅱ )、Ｍｏ(Ⅵ )之间的分离。该萃取体系与传统的有机溶剂萃取分离方法相比 ,具有平衡时间短 ,相分离速度快 ,无三相乳化 ,不使用有毒害有机溶剂 ,操作简单 ,快速均相萃取 异相分离等优点 ,既能萃取离子缔合物 ,又能萃取络阴…     

Luminescence of Thin Films of Lead and Bismuth Tungstates

The luminescence spectra of thin films of PbWO₄ and Bi₂WO₆ were investigated. It is shown that these spectra are similar and that they consist of three individual bands in the blue (2.80 eV PbWO₄ and 2.93 eV Bi₂WO₆), green (2.35 eV PbWO₄ and Bi₂WO₆), and red (1.75 eV PbWO₄ and 1.90 eV Bi₂WO₆) spectral regions. The differences in the nature of the absorption centers of excitation energy are established. The distinguishing features displayed by the temperature dependences of the individual emission bands in the PbWO₄ films are explained by energy migration between emission centers via transfer of free carriers through the conduction and valence bands.     

Er对Mo-Bi-O催化剂性能的影响

Er2O3;异丁烯;甲基丙烯酸;部分氧化;Er对Mo-Bi-O催化剂性能的影响     

Syntheses and Crystal Structure Characterizations of New Rare Earth Nickel Bismuth Compounds RNixBi2 (R = Y, Gd Tb and Dy)

1 INTRODUCTION In recent decades, the ternary systems of rare earth (R)-transition metal (T)-pnictogen (M) show rich chemistry and have attracted wide interest[1] because of their unusual physical properties, such as heavy Fermion, thermoelectric transformation, etc[2]. Although some antimonide phases have been re- ported[3, 4], bismuthide systems have been less inves- tigated up to now. In comparison with antimony systems, rich compounds in bismuth systems are also expected to be disco…     

Synthesis, Properties and Crystal Structure of a Novel Coordinated Polymer: {(H2en)(H3O)[(BiPb(C2O4)4(H2O)2)]·2(H2O)}n

A novel oxalate compound {(H2en)(H3O)[BiPb(C2O4)4(H2O)2]·2(H2O)}n 1 (en = ethylenediamine) containing lead and bismuth has been synthesized by hydrothermal methods, and structurally characterized by X-ray single-crystal diffraction. It crystallizes in monoclinic, space group P21/c with a = 11.6160(1), b = 12.7426(1), c = 15.5683(5) (A), β = 108.442(4)°, BiPbC10N2O21H21, Mr = 921.46, V = 2186.0(4) (A)3, Z = 4, Dc = 2.800 g/cm3, F(000) = 1712 and μ(MoKα) = 15.837 mm-1. The final R = 0.0502 and wR = 0.1261 for 3391 observed reflections with I > 2(σI). The title com- pound consists of 2-D polyanions and protonized organic amine cations, and they are combined to each other by static attractive force and H-bonds to form the so-called organic-inorganic hybrid material.     

Sb掺杂对0.96(K0.49Na0.51)(Nb0.97-xTa0.03Sbx)O3-0.04Bi0.5(Na0.8K0.2)0.5ZrO3无铅压电陶瓷结构与电性能的影响研究

采用固相法制备了0.96(K0.49 Na0.51)(Nb0.97-xTa0.03Sbx) O3-0.04Bi0.5(Na0.8K0.2)0.5ZrO3(0.96KNNTSx-0.04BNKZ,x=0,0.01,0.02,0.03,0.04)无铅压电陶瓷,研究了Sb掺杂量对0.96KNNTSx-0.04BNKZ陶瓷相结构、微观结构和电性能的影响规律.X射线衍射(X-ray Diffraction,XRD)分析结果表明:0.96KNNTSx-0.04BNKZ陶瓷具有纯钙钛矿结构,随着Sb掺杂量x的增加,陶瓷由正交-四方两相共存逐渐转变为四方相,在x≤0.01时,陶瓷为正交-四方两相共存的多型相转变(Polymorphic Phase Transition,PPT)结构,而当x≥0.02时,陶瓷则转变为四方相结构.在PPT向四方相转变的组成边界x=0.02处,陶瓷具有优异的电性能:压电常数d33=345 pC/N,机电耦合系数kp=39.2;,机械品质因数Qm=51,介电常数ε33T/ε0=1520,介电损耗tanδ =2.7;,剩余极化强度Pr=15.4 μC/cm2,矫顽场Ec =1.09kV/mm,居里温度Tc=275℃.     

砷锑铋对阴极铜沉积过程的影响

用线性电位扫描、ＸＰＳ、ＸＲＤ等方法，研究了砷锑铋离子对酸性硫酸铜系统中铜沉积反应动力学及铜沉积层成份与结构的影响．研究表明：Ａｓ（Ⅴ）离子能增大铜沉积反应的交换电流密度，对铜沉积过程起去极化作用；Ｓｂ（Ⅲ）、Ｂｉ（Ⅲ）离子均使铜沉积反应交换电流密度减小，对铜沉积过程起极化作用；但砷锑铋离子不改变铜沉积反应的机理．测试表明：用２００Ａ／ｍ２电流密度电解，砷锑铋不会在阴极沉积，也不影响铜沉积层的晶面择优取向（２２０）；用１５００Ａ／ｍ２电流密度电解，发现砷与铋在阴极与铜共沉积，铜沉积层的晶面择优取向变为（１１１），沉积层中铜主要以金属Ｃｕ和少量Ｃｕ２Ｏ形式存在，铋主要以Ｂｉ２Ｏ３形式存在．     

钨酸盐对镁合金在3.5%NaCl介质中的缓蚀作用

研究钨酸钠对AZ61镁合金在3.5%NaC l腐蚀介质中的缓蚀作用.电化学阻抗谱(EIS)、Tafel极化曲线、扫描电子显微镜(SEM)等测试表明,钨酸钠缓蚀剂可有效抑制镁合金在NaC l介质中的腐蚀,当钨酸钠浓度为0.01 mol.L-1可达到较好的缓蚀效果,缓蚀效率达75.5%.钨酸钠可参与镁合金表面膜的形成,使表面膜更致密,从而抑制镁合金的腐蚀;其缓蚀作用属于阳极抑制型缓蚀机理.     

焙烧温度对甲硫醇催化剂K_2WO_4/Al_2O_3结构和性能的影响

研究了焙烧温度对溶胶-凝胶法制备的甲硫醇催化剂K2WO4/Al2O3的表面结构和催化性能的影响.表征结果显示,K2WO4在Al2O3上分散得较好,在450和550oC焙烧的催化剂颗粒大小均匀,无明显团聚现象.随着焙烧温度的升高,催化剂的比表面积减小,表面钨物种与Al2O3的相互作用减弱,与碱物种的相互作用增强,酸碱强度降低.K2WO4/Al2O3表面不含质子酸.催化剂活性与其比表面积及表面的共轭酸碱对密切相关.评价结果表明,在550oC焙烧而制得的催化剂活性最高.