MPS／CAS Cooperation on Solid State Chemistry

The cooperation between Zhao Jingtai and the Max Planck Institute for Chemical Physics of Solids was initiated immediately after the research field Inorganic Chemistry (headed by Rudiger Kniep) started its work in Dresden. The first contact was established when Zhao Jingtai came from the Xiamen University as a Max Planck fellow. At that time, the chemistry of the intermetallic compounds of rare-earth metals was chosen as a topic of joint investigations with Yuri Grin. Later, the solid state chemistry of the borophosphates was added to the program of concerted research in the group of Zhao Jingtai and the Max Planck Institute for Chemical Physics of Solids. The cooperation was intensified after the move of Zhao Jingtai to the Shanghai Institute of Ceramics and the establishment of an Inorganic Materials Chemistry and Physics Group there. The results of the investigations performed from 1999 to 2003 were published in more than 25 scientific papers and more than ten contributions to scientific conferences.     

低温超导"热"起来

设想你在家里后院走着走着，突然在一个你自以为洞悉一切的角落里发现了金矿脉；再设想一下电影《豪门新人类》(Beverly Hillbillies)里，Jed Clampett发现石油从地下滚滚而出时的惊喜。2001年初的几个星期，当有研究人员称二硼化镁在温度接近40K时电阻为零，即具备超导性，固体物理学界就沉浸在这种惊喜之中。     

巧防春菜花“散球”

春菜花生产中，易出现花球没长多大，花枝便早早伸长、散开，致使花球稀疏；有的花球顶部呈现紫绿色绒毛状，过一段时间，抽出的花枝可见到明显花蕾，整个花球呈鸡爪状等现象，造成春菜花“散球“。其主要原因是：选用品种不当，定植过晚，苗期缺水，伤根过重，肥水供应不匀(尤其是莲座期缺氧，结球期肥水供应不匀)土壤缺硼，收获不适时等。为提高花球质量，在生产上应采取以下几项措施。     

凤阳地区部分饲料资源硼含量状况

本文采用姜黄素比色法对凤阳地区部分饲料淘汰的硼含量进行了分析测定。测出了凤阳地区的玉米（0.0761微克/克）、小麦（0.0194微克/克）、高梁（0.0221微克/克）、玉米饼（0.7231微克/克）、麸皮（0.0229微克/克）、酒糟（0.1516微克/克）、野苜蓿（0.4630微克/克）、苜蓿（盛花期0.2050微克/克）、白三叶(0.1213微克/克）、大白菜（0.2386微克/克）、山芋（0.0186微克/克）、胡萝卜（0.0603微克/克）等三十九种饲料的硼含量。为配制生产硼的平衡饲料及硼的研究提供科学依据。     

苯甲酸氧弹燃烧法测定植物体中的硼含量

以苯甲酸为助燃剂，用氧弹燃烧法灰化植物体进行硼元素测定，操作简便、快捷、无污染。     

杯芳烃聚硅氢烷固定相的色谱性能研究

在介绍毛细管柱的制备基础上，对几种杯[4]芳烃固定相(PSO—C[4]A、PSO—C[4]B、PSO—CYCL—C[4]A和PSO—TBU—CYCL—C[4]A及与OV—1701混涂的柱子C[4]A—OV—1701、C[4]B—OV—1701)的柱效、麦氏常数进行了测评。结果表明，它们都具有较高的柱效；连有极性基团—CONH—呈中等极性，丁基取代的杯[4]芳烃聚硅氧烷极性偏弱。     

Phenol Tert-Butylation Catalyzed by Zeolite H-Mordenite

Para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol ( 2,4-DTBP) are wi.dely used for the preparation of antioxidants. Zeolite catalysts showed good performance for the synthesis of p-TBP and 2,4-DTBP. In this work, zeolite H-mordenite (HM) catalyst was prepared and the alkylation of phenol with tert-butyl alcohol over zeolite HM catalyst was investigated at different reaction conditions. It is found that increasing temperature enhances the selectivity to p-TBP and the optimum reaction temperature for phenol conversion is 438 K. Increasing flow rate decreases phenol conversion apparently while the selectivity to p-TBP has a little increase. The suitable tert-butyl alcohol/phenol molar ratio is 2. Lower alcohol/phenol molar ratios are beneficial to p-TBP while higher ones are helpful for producing 2,4-DTBP.     

稀土元素在模具钢渗硼中的作用

本文讨论了稀土元素对模具钢渗硼的一些影响,渗硼后显微硬度的分布规律,表明了渗硼后工件表面有着极高的硬度,良好的耐磨性。稀土元素的加入对催渗作用的影响存在着一个最佳值。     

合金钢、铁合金中微量硼的测定

利用姜黄素在强酸非水介质中与硼酸生成有色络合物测定微量硼 ,并进行比色测定 ,方法检出限为 7 7× 10 - 8g mL ,相对标准偏差为 0 5 9% (3 3× 10 - 7g mL ,姜黄素 ,n =10 ) ,线性范围 :2 0× 10 - 7～ 1 2× 10 - 6g mL .     

二元金属化合物MgB2的超导电性及其掺杂效应

简要介绍了MgB2超导体的同位素效应、ρ-T特性、S-T特性、双能隙，着重论述了元素掺杂对其超导电性的影响，指出其作为一种新型低成本高性能的超导材料具有广泛的应用前景。