The Effect of MgO, CNT, TiO_2 Addition on Transport Properties and Formation (Bi,Pb)-2223 Prepared By Solid State Method and Recurrent Sintering

摘要

The effect of MgO, CNT, TiO_2 addition on the structural and transport properties of Bi_(1.6)Pb_(0.4)Sr_2Ca_2Cu_3O_8 superconducting samples have been investigated. The samples were prepared by solid-state method and recurrent sintering. The samples were characterized by x-ray diffraction (XRD), scanning electron microscopy, and electrical resistivity measurement. The critical superconductivity transition temperature (Tc) of MgO, CNT, TiO_2 addition were found to be lower than the pure sample. T_(c-onset) was found 121.5 K; 117.5 K; 120.8 K; 120.1 K with broad transition 15.4 K; 15.8 K; 22 K; 46.8 K for pure BPSCCO sample and MgO, CNT, TiO_2 addition samples, respectively. XRD analysis showed that the decrease of the volume fraction Bi-2223 and increase Bi-2212 phase with addition MgO, CNT, and TiO_2. Recurrent sintering increased Tc and narrowed transition temperature.