四(对氯苄基)锡(p-Cl-PhCH2)4Sn的合成及晶体结构

利用对氯苄基氯和锡反应,合成了四(对氯苄基)锡,用X-射线单晶衍射测定了该化合物的晶体结构.化合物晶体为正交晶系,空间群 fdd2,a=2.1237(9)nm,b=2.2127(11)nm,c=1.1235(5),α=90°,β=90°,γ=90°,Z=8,V=5.279(4)nm3,Dc=1.562g/cm3,μ=1.388 mm-1,R=0.0396,wR=0.0690.锡原子呈畸变四面体构型.分子间通过Cl…Cl近距作用,形成一维链状结构.     

甲基橙指示还原终点铈量法测定铁矿石中全铁含量

铁矿石经HCl-KF HCO4溶样后，用二氯化锡还原Fe^3 为Fe^2 ，以甲基橙做指示剂指示还原终点，肺铈量法测定铁矿石中全铁的含量。方法简便，快速，终点每锐，精密度好，准确度高。     

A Novel Instrument for the Measurement of the Thermal Conductivity of Molten Metals. Part II: Measurements

New measurements of the thermal conductivity of molten mercury, gallium, tin, and indium are reported up to 750 K. The measurements are performed in a novel transient hot-wire instrument described elsewhere. The present experimental technique overcomes problems of convection, and it is shown that it operates in an absolute way in accord with a theoretical model. The uncertainty of the thermal conductivity results is estimated to be ± 2%, which is superior to that achieved in most earlier work. The low uncertainty of the present experimental results has allowed us to test the only significant theory for the thermal conductivity of molten metals, which relates this property to the electrical conductivity. The pattern of results among the four metals indicates that further theoretical developments would be warranted.     

Preparation and CO gas-sensing behavior of Au-doped SnO2 sensors

A study on the low-temperature CO gas sensors based on Au/SnO₂ thick film was reported. Au/SnO₂ powders, with different Au loading from 0.36 to 3.57 wt%, were prepared by a deposition-precipitation method. Thick films were fabricated from Au/SnO₂ powders. The Au/SnO₂ thick-film sensors exhibited high sensitivity to CO gas at relatively low operating temperature (83-210 °C). We also reported the effect of the Au loading in Au/SnO₂ on the CO gas sensing behavior. The optimal Au loading in as-prepared Au/SnO₂ was 2.86 wt%.     

高分子网络凝胶法制备SnO2/TiO2复合粉及其光催化性能

以TiCl3和SnCl4·5H2O为原料,采用高分子网络凝胶法制备SnO2/TiO2复合粉体.用制备的复合粉体对大红染料的稀释溶液进行脱色检验其光催化性能,并用XRD、TEM对粉体进行表征.结果表明利用高分子网络凝胶法制备的复合光催化剂粒径小、分布均匀可控.一定量的Sn掺杂使复合光催化剂活性明显优于单一的TiO2,n(SnO2)/n(TiO2)=6%时复合催化剂具有最高的催化活性.     

AgSnO2触头材料在直流灯负载下的电侵蚀特点

通过模拟实验机对直流灯负载下汽车继电器用银氧化锡(AgSnO2)系列触头材料进行电性能实验。观察了不同成分、不同工艺的银氧化锡触头材料的电侵蚀情况，总结分析了它们在实验中表现出的电侵蚀特点。指出了影响银氧化锡触头材料电性能的主要因素。     

含Mn中间层钛基二氧化锡电催化电极的性能

采用高温热氧化方法制备了含Mn中间层的钛基二氧化锡电催化电极Ti/Mn/SnO2.采用SEM、EDX以及XPS等检测方法对电极表面涂层的形貌、元素组成及元素化学态进行了分析,研究了所制备Ti/Mn/SnO2电极电催化氧化降解苯酚的性能.结果表明,Mn中间层的引入降低了电极对苯酚的电催化降解活性,使电极的使用稳定性大为提高.含Mn中间层的存在,可防止电化学反应过程中析出的氧向基体的扩散,离子对Mn2 /Mn4 与Sn2 /Sn4 的存在改变了SnO2电极表面催化剂的组成和结构,导致电极性能变化.     

苯芴酮-溴代十六烷基三甲胺分光光度法测定析出铅中的锡

用硝酸-酒石酸分解试样,在含有酒石酸(0.16mol/L)的盐酸溶液中,锡(Ⅳ)与苯芴酮-溴代十六烷基三甲胺(CTMAB)生成有色络合物,采用分光光度法直接测定析出铅中的锡.此络合物在波长530nm处有最大的吸光度,摩尔吸光系数ε=6.74×104,锡(Ⅳ)含量为0.25～80μg/50mL,符合比尔定律.该法快速、准确、重现性好,适应于析出铅中含锡0.005%～1.60%的测定.     

Ultraflat indium tin oxide films prepared by ion beam sputtering

Indium tin oxide (ITO) films with a smooth surface (root-mean-square roughness; R_rms=0.40 nm) were made using a combination of the deposition conditions in the ion beam-sputtering method. Sheet resistance was 13.8 Ω/sq for a 150-nm-thick film grown at 150 °C. Oxygen was fed into the growth chamber during film growth up to 15 nm, after which, the oxygen was turned off throughout the rest of the deposition. The surface of the films became smooth with the addition of ambient oxygen but electrical resistance increased. In films grown at 150 °C with no oxygen present, a rough surface (R_rms=2.1 nm) and low sheet resistance (14.4 Ω/sq) were observed. A flat surface (R_rms=0.5 nm) with high sheet resistance (41 Ω/sq) was obtained in the films grown with ambient oxygen throughout the film growth. Surface morphology and microstructure of the films were determined by the deposition conditions at the beginning of the growth. Therefore, fabrication of ITO films with a smooth surface and high electrical conductivity was possible by combining experimental conditions.     

烧成温度与导电陶瓷电性能关系的研究

本文通过X—射线衍射分析及阻温特性别定等方法研究了SnO2导电陶瓷的晶相组成和电性能与烧成温度的关系。结果表明，随烧成温度提高试样中SnO2金红石型晶体的含量有所增加，试样的材料常数和活化能降低，材料导电性能增强，同时还对导电陶瓷的导电机理进行了探讨。