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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-x)Sb_xSr_2Ca_(2.5)Cu_(3.7)O_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值随烧结时间的延长而增大。如在低于865℃的温度下退火,高温相又可转变为低温相。据此,我们用高温长时间烧结后快速降温,用较低温度下退火的办法制成零电阻温度为113K的高T_c单相超导材料。
In the Bi-Sr-Ca-Cu-O system, a suitable amount of Sb is doped, and the content of the high-temperature phase (110K phase) is obviously higher than that of the Sb-free sample. Sb has the effect of accelerating the formation of high temperature phase. X = 0.1 is the most favorable for the formation of high temperature phase for the samples with different meaning components of Bi 2-x Sb x Sr 2 Ca 2.5 Cu 3.7 3.7 O_y. After quenching in liquid nitrogen and tempering at a low temperature, it was found that the first phase formed in the sample sintered at 865 ° C was a low temperature phase (80K phase) and then gradually transformed into a high temperature phase. T_c value increases with the sintering time. If annealed below 865 ° C, the high temperature phase may turn into a low temperature phase. Accordingly, we use high temperature for a long time after sintering rapidly cooling, annealing at a lower temperature to make a zero-resistance temperature of 113K high T_c single-phase superconducting materials.