Polymerized complex synthesis of a pure 93 K Y2Ba4Cu7O15-d superconductor without the need of high oxygen pressure and additive catalysts
Polymerized complex synthesis of a pure 93 K Y2Ba4Cu7O15-d superconductor without the need of high oxygen pressure and additive catalysts
复制标题
无需高氧压和添加剂催化剂的纯 93 K Y2Ba4Cu7O15-d 超导体的聚合复合合成
DOI：
10.1063/1.353097
复制
发表时间：
1993
影响因子：
3.2
通讯作者：
M. Käll
中科院分区：
文献类型：
--
作者：
P. Berastegui;M. Kakihana;M. Yoshimura;H. Mazaki;H. Yasuoka;L. Johansson;S. Eriksson;L. Börjesson;M. Käll
在870℃下，不使用高氧压力，不使用添加剂催化剂，采用聚合络合法合成了超导相Y2Ba4Cu7O14.82（247）的高纯陶瓷材料。该方法是通过金属柠檬酸盐配合物与乙二醇之间的聚酯反应制备聚合物-金属配合物前驱体。除了不需要高氧压力这一事实外，与其他湿化学方法相比，目前的制备技术提供了更方便和更容易制造高纯度247材料，因为它省去了许多步骤，如离心、过滤、老化和pH控制。X射线衍射和拉曼散射分析表明，材料是单相的，没有任何二次相的迹象。在88.0 K下实现了零电阻，过渡宽度小于4 K。复杂的交流磁化率测量证实了单个体超导247相的存在，Tc（起始）=…
High‐purity ceramic material of the superconducting phase Y2Ba4Cu7O14.82 (247) has been synthesized at 870 °C by the polymerized complex method using neither high oxygen pressure nor additive catalysts. The method is based on the formation of a polymer‐metal complex precursor which is prepared through polyesterification between metal citrate complexes and ethylene glycol. Apart from the fact that high oxygen pressure is unnecessary, the present preparation technique offers more convenient and easier fabrication of highly pure 247 material compared with other wet chemical routes since it eliminates many steps such as centrifugation, filtration, aging, and pH control. X‐ray diffraction and Raman scattering analyses show that the material is single‐phase without any indication of secondary phases. Zero‐resistance has been achieved at 88.0 K with a transition width narrower than 4 K. Complex ac magnetic susceptibility measurements confirm the presence of a single bulk superconducting 247 phase with Tc(onset)=...