【摘要】 采用普通固态反应法制备了Bi_1.6Pb_0.4Sr₂Ca₂Cu_3-xTi_xO_y（X=0.0;0.05;0.1;0.2;0.3）系列超导样品。测量了样品的电阻——温度关系、交流磁化率——温度关系和X射线衍射谱,并进行了样品微区成份分析。作者发现:在X=0.0—0.2范围,该体系的零电阻温度均在100K以上,在X=0.3时,在液氮温区不超导;Ti含量X=0.1时,样品的单相性最好;Ti元素的微区分布不很均匀。我们倾向于认为Ti实际上可能不是替换Cu而是替换了Ca.更多还原

【Abstract】 A series of samples with nominal composition Bi1.6Pb0.4Sr2Ca2Cu3-x TixOy(x = 0.0; 0.05; 0.1; 0.2; 0.3) were prepared by solid-state reaction method. The resistivity us temperature plots, the a. c. susceptibility us. temperature plots and XRD spectrums were measured; micro-area compostions were examined for the samples. It is found that the temperature of zero resistance of the system are above 100K when x = 0.0-0.2; non-superconducting at LN2 temperature when x = 0.3. The single phase degree is highest when x = 0.1. EDAX indicates that the micro-area distribution of the element Ti is not very uniform. We believe that Ti is substantially substituted for Ca instead of Cu.更多还原