含Sb的Bi系超导体的研究

Bi-Sr-Ca-Cu-O系中掺入适量的Sb,其高温相(110K相)含量明显多于不掺Sb样品。Sb具有加速高温相形成的作用。对于各义组分为Bi_2-xSb_xSr₂Ca_2.5Cu_3.7O_y的样品,x=0.1最有利于高温相的形成。用液氮中淬火后低温回火的方法,发现在865℃烧结时样品中首先形成的是低温相(80K相),然后再逐渐转变为高温相。T_c值随烧结时间的延 关键词：

STUDY ON Sb-DOPED Bi SYSTEM SUPERCONDUCTOR

In the samples of Sb proper doping Bi-Sr-Ca-Cu-O system, the content of the high temperature phase (110K phase) is obviously much higher than that of the Sb-free samples'. Sb has a function of accelerating the formation of the high T_c phase. For the nominal composition of Bi_2-xSb_xSr₂Ca_2.5Cu_3.7O_y x = 0.1 is most beneficial to the formation of the high T_c phase, After quenching in liquid nitrogen and annealing at low teperatures, it is found that the low T_c phase (80K phase) is firstly formed when the samples are sintered at 865℃, then the low T_c phase changes to the high T_c phase, until all materials become the high T_c phase eventually. The value of T_c increases continuously with time lasting. If annealed at lower em-perature, the high T_c phase will change to the low T_c phase. Based on this discovering, after sintering at high temperature, for a long time, fast cooling to a low temperature, annealing for some time, then naturally cooling to room temperature, we have successfully prepared the high T_c single phase superconductor with zero resistance temperature 113K.