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新型高T_c氧化物超导体Bi—Sr—Ca—Cu—O系,在100K以上呈现超导性,存在高T_c(～110K)相和低T_c(～80K)相,其零电阻转变温度(T_(c0))总是低于85K.适当掺Pb可以增强高T_c相,抑制低T_c相,降低烧结温度,提高零电阻转变温度.用固相反应法制得组分为Bi_(1.6)Pb_(0.4)Sr_2Ca_2Cu_3O_y的超导体,零电阻温度为107K,稳定性较好。现以此样品作示差扫描量热(DSC)分析,并配合XRD分析,试图了解该体系的结构相变及其与超导电性的关系.
The novel high-T_c oxide superconductor Bi-Sr-Ca-Cu-O shows superconductivity above 100K with high Tc (~ 110K) phase and low Tc (~ 80K) c0) is always lower than 85 K. The appropriate Tb addition can enhance the high Tc phase, suppress the low Tc phase, decrease the sintering temperature and increase the zero-resistance transition temperature.The composition of Bi_ (1.6) Pb_ (0.4) Sr2Ca2Cu_3O_y superconductor, zero-resistance temperature of 107K, good stability. Now this sample for differential scanning calorimetry (DSC) analysis, and with XRD analysis, trying to understand the structure of the system and its relationship with superconductivity.