一种加锑减锡的铜基减摩材料的研制

在6－6－3青铜基含油轴承的基础上，进行了减锡加锑的试验，研制出了符合ZBW90002—88要求性能以锑部分代替锡的新合金，为节约锡资源、开辟锑的应用领域指出了一条新途径。     

微量元素铋,锑对大断面球铁件石墨形态的影响

本实验使用光学显微镜和分析电检查了石墨形态。实验结果表明，在含稀土的球铁中加入铋，锑可以使石墨政治协商会议数量显著增加，并使石墨球更加细小、圆整、消除了大断面球铁中的畸变石墨。另外，检查结果发现，石墨核心主要是由稀土与铋、锑、铝等元素组成的复杂化合物。因此，可以认为导致大断面球铁石墨畸变的根本原因是缺乏足够的稳定结晶核心。     

氢化物发生-电感耦合等离子体原子发射光谱法测定钼铁中砷锡锑铋

钼铁作为冶炼过程中钼元素的加入剂,为保证冶炼质量,需对砷、锡、锑、铋含量进行严格控制,采用国标方法或原子荧光光谱法,只能单个元素分别检测,分析速度慢,周期长。实验通过氢化物发生法使 砷、锡、锑、铋在0.264mol/L硼氢化钠-40%盐酸的酸还原体系下还原为挥发性共价氢化物,然后借助载气流将其导入电感耦合等离子体原子发射光谱仪中进行测量,从而建立了氢化物发生-电感耦合等离子体原子发射光谱法(ICP-AES)测定钼铁中砷、锡、锑、铋的方法。确定各元素的分析谱线为As 193.759nm、Sn 189.989nm、Sb 217.581nm、Bi 223.061nm;为了消除基体效应的影响,采用基体匹配法配制标准溶液系列绘制校准曲线,各元素的校准曲线线性相关系数均不小于0.999;砷、锡、锑、铋的检出限分别为0.0003%、0.0009%、0.0009%、0.0012%。方法应用于钼铁试样中砷、锡、锑、铋的测定,结果的相对标准偏差(RSD,n=6)为3.1%~4.8%;各元素加标回收率为92%~110%。     

Growth and characterization of CuSbS2 crystals

The liquidus curves in the Cu-Sb-S system near CuSbS₂ composition and between CuSbS₂ and Sb₂S₃ were determined by cooling arrests of seeded melts. CuSbS₂ melts congruently at 552.25 ± 0.14°C and a eutectic occurs between CuSbS₂ and Sb₂S₃ at 490 ± 5°C and 0.72 ± 0.05 mole fraction Sb₂S₃. No additional phases appear on the liquidus surface in this portion of the Cu-Sb-S system. Crystals of CuSbS₂ were grown from the stoichiometric composition using the Bridgman Stockbarger method. At room temperature, the band gap of CuSbS₂ is 0.28 eV; however below 80K, a drop in resistivity suggests the appearance of a new phase. Measurements of photo current suggest that the band gap of the low temperature phase is greater than 0.58 eV.     

Microstructure and Crystal Structure in TAGS Compositions

GeTe, a small bandgap semiconductor that has native p-type defects due to Ge vacancies, is an important constituent in the thermoelectric material known as TAGS. TAGS is an acronym for alloys of GeTe with AgSbTe₂, and compositions are normally designated as TAGS-x, where x is the fraction of GeTe. TAGS-85 is the most important with regard to applications, and there is also commercial interest in TAGS-80. The crystal structure of GeTe_1+δ has a composition-dependent phase transformation at a temperature ranging from 430°C (δ = 0) to ~400°C (δ = 0.02). The high-temperature form is cubic. The low-temperature form is rhombohedral for δ < 0.01, as is the case for good thermoelectric performance. Addition of AgSbTe₂ shifts the phase transformation to lower temperatures, and one of the goals of this work is a systematic study of the dependence of transformation temperature on the parameter x. We present results on phase transformations and associated instabilities in TAGS compositions in the range of 70 at.% to 85 at.% GeTe.     

Evaluation of 1/f Noise Characteristics for Si‐Based Infrared Detection Materials

Silicon antimony films are studied as resistors for uncooled microbolometers. We present the fabrication of silicon films and their alloy films using sputtering and plasma‐enhanced chemical vapor deposition. The sputtered silicon antimony films show a low 1/f noise level compared to plasma‐enhanced chemical vapor deposition (PECVD)‐deposited amorphous silicon due to their very fine nanostructure. Material parameter K is controlled using the sputtering conditions to obtain a low 1/f noise. The calculation for specific detectivity assuming similar properties of silicon antimony and PECVD amorphous silicon shows that silicon antimony film demonstrates an outstanding value compared with PECVD Si film.     

ATO的表面修饰及其在抗静电胶中的应用

采用不同分子质量聚乙二醇（PEG）对锑掺杂纳米二氧化锡（ATO）进行了表面改性并比较了改性效果,用共混法制备了醋酸乙烯酯／锑掺杂纳米二氧化锡（PVAc／ATO）复合乳液,研究了复合乳液的物理力学性能及导电性能：结果表明,经过相对分子质量为20000的PEG表面修饰的ATO在乳液中分散良好,在含量较低情况下即可得到导电性良好的胶膜,且能增强乳液的粘接性能。     

原位聚合法制备纳米ATO/PMMA乙醇分散液的研究

将纳米掺锑二氧化锡(ATO)粒子经过超声分散和偶联剂处理后,以甲基丙烯酸甲酯(MMA)为单体,用原位聚合法制备了纳米ATO/PMMA乙醇分散液。讨论了偶联剂种类、MMA与ATO质量比值、引发剂偶氮二异丁腈(AIBN)用量对纳米ATO/PMMA乙醇分散液分散稳定性的影响。确定了合适的偶联剂为乙烯基三叔丁基过氧硅烷(VTPS),最优工艺参数为m(MMA)∶m(ATO)=2,w(AIBN)=1.5%。往聚丙烯酸酯树脂加入该纳米ATO/PMMA乙醇分散液所制得的涂料,其涂膜同时具有良好的可见光透过率和近红外光阻隔性能。     

吸附法处理锑污染水的研究进展

介绍了水解性金属混凝剂、无机矿物、活性炭和有机吸附剂对水溶液中锑的吸附性能,通过比较,指出了活性炭和有机吸附剂具有很好的吸附去除和回收水溶液中锑的应用前景,而无机矿物则更适用于控制环境中锑的行为。     

成都市东北部冬季大气PM_(2.5)中砷锑形态研究

砷锑是具有潜在毒性的元素,在大气颗粒物中聚集,被人体吸入对人体造成不良危害。Fernandez改进了Tessier法和BCR法。本次研究优化了提取方法, AFS测定每个形态检出限低至0.001ng/mL,用原子荧光测得数据相对标准偏差0.476%～3.77%,土壤标准物质总量回收率在90.2%～107%,该方法简便、灵敏度高。测得砷锑形态主要以水溶态为主,水溶态是最容易被生物利用的态。