【作者】 李凤华； 王珏； 樊占国； 刘常升； 苏大和；

【Author】 Li Fenghua~1, Wang Jue~1, Fan Zhanguo~(1*), Liu Changsheng~1, Soh Deawha~2 (1. School of Material and Metallurgy, Northeastern University, Shenyang 110004, China; 2. Myongji University, Korea)

【机构】 东北大学材料与冶金学院； 韩国明知大学；

【摘要】 测量了不同含量PbO和BaPbO₃掺杂YBa₂Cu₃O_7-δ的熔化温度和超导临界转变温度（T_c）。在YBa₂Cu₃O_7-δ中掺入PbO可以降低熔点,但X射线衍射分析表明高温下YBa₂Cu₃O_7-δ与PbO发生了反应生成BaPbO₃,降低了样品的超导电性。分别用BaCO₃与PbO,BaCO₃与PbO₂合成了单相的BaPbO₃。在YBa₂Cu₃O_7-δ中添加了不同含量的BaPbO₃（10%,20%,30%）。X射线衍射分析表明YBa₂Cu₃O_7-δ与BaPbO₃没有发生反应。掺杂了BaPbO₃的YBa₂Cu₃O_7-δ比掺杂PbO具有较好的超导电性,但是不能降低YBa₂Cu₃O_7-δ的熔点。更多还原

【Abstract】 The melting temperature and critical temperature（T_c） of YBa₂Cu₃O_7-δ with deferent content impurities of PbO and BaPbO₃ were studied. When the PbO was used as addition in YBa₂Cu₃O_7-δ, although the melting point could be reduced, the superconductivity（the transition wide, △T_c） became pure. From the XRD pattern of the sintered mixture of YBa₂Cu₃O_7-δ and PbO it was known that there was a reaction between YBa₂Cu₃O_7-δ and PbO, and the product was BaPbO₃. In the process of the reaction the superconducting phase of Y Ba₂Cu₃O_7-δ was decreased and in the sample BaPbO₃ became the main phase. Therefore the superconductivity was reduced. BaPbO₃ was chosen as the impurity for the comparative study. The single phase BaPbO₃ was synthesized by the simple way from both mixtures of BaCO₃ and PbO, BaCO₃ and PbO₂. Deferent contents of BaPbO₃ （10%,20%, 30%） were added in the YBa₂Cu₃O_7-δ. By the phase analysis in the XRD patterns it was proved that there were not reactios between YBa₂Cu₃O_7-δ and BaPbO₃. When BaPbO₃ was used as impurity in YBa₂Cu₃O_7-δ the superconductivity was much better than PbO as impurity in YBa₂Cu₃O_7-δ. But the melting point of YBa₂Cu3O_7-δ with BaPbO₃ was higher than 1010℃ in the DTA measurement.更多还原