【摘要】 采用普通固态反应法制备了名义组分为 Bi_2.0-xPb_xS_r1.9Ca_2.2Cu_3.3O_y 超导体.对样品进行了物相分析、电阻率及磁化率测量.XRD 分析表明:富 Ca 富Cu 有利于高 T_c 相的形成,并且获得了高 T_c 单相样品。交流磁化率曲线测量表明:样品的低温区转变台阶位于85～95K 之间.且2212相的 T_c 随氧含量、组分、工艺等因素变化.更多还原

【Abstract】 The superconductors with nominal composition of Bi_2.0-x Pb_x Sr_1.9 Ca_2.2 Cu_3.3 O_y are prepared by solid-state reaction method.The samples have gone through phase analyzing,the measurments of resistence and a.c.susceptibility.XRD indicates that rich-Ca,Cu is beneficial to form the highcr-Tc phasc;it is of very good quality.The measurment of a.c.susceptibility suggestes that the transition step at a lower temperature rang varied from 85K to 95K.It is believed that ‘2212’ phase’s T_c would vary with oxgen content,composition and condition.更多还原