【摘要】 用固相反应法制备了所有的掺杂样品,并研究了掺入CeO₂（x=0.0-2.0wt%）对Bi1.6Pb0.4Sr2Ca2Cu3Oδ超导体性能的影响.研究表明,超导材料的性能如临界温度、微观结构和超导相的形成都与CeO₂的掺杂量有很大的关系.CeO₂的掺入可以改变（Bi,Pb）-2223相的体积分数,并且,0.2wt%CeO₂的掺杂提高了样品的Tc（onset）.同时,SEM照片显示:当CeO₂掺杂比例从0.0wt%至0.2wt%时,样品的微观结构变的越来越致密,这表明适当的CeO₂掺杂量能提高样品的结晶性和促进晶粒的生长.然而,对于x=2.0wt%的掺杂样品,在R-T曲线没有观察到零电阻现象,说明掺入过量的CeO₂破坏了相邻晶粒之间的连接性以及超导相的晶体结构.更多还原

【Abstract】 The investigation of doping effect of x CeO₂（x=0.0².0 wt.%）in Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_δ superconductor and all doped samples were prepared by solid-state reaction technique.Some superconducting properties were found to be strongly dependent on CeO₂ content.The nano CeO₂ additive can change the volume fraction of（Bi,Pb）-2223 phase and the Tc（onset）which increased at x=0.2wt.%doping amount of CeO₂ such as critical temperature,microstructure and the formation of BSCCO phase.At the same time,as shown in the SEM photographs,the microstructure of sample doped with 0.2 wt.%CeO₂ became denser,which indicated that appropriate doping amount of CeO₂ can promote crystal nucleation and grain growth.However,for the sample doped with x=2wt.%CeO₂ additive,the zero resistance were not observed from R-T curves,which suggested that the oxides with excess inrtoduction could destroy the link between neighboring grains and BSCCO phase crystal structure.更多还原