STUDY OF THE MIXTURES OF MGB₂ AND HIGH T_C SUPERCONDUCTORS

Abstract

To get some information about the interaction of two totally different kinds of superconductors in a mixture, we prepared the samples of mixture of two kinds of superconductors ( YBa 2 Cu 3 O 7+ MgB 2), using normal annealing method at low temperature (400 °C ~ 600 °C). The variations of the transition temperature (Tc) and critical current (Jc) of the mixtures are investigated. We also prepared a series of samples of MgB 2 with small ratios of YBCO or Bi -2223 as addition. Carefully comparison shows that the Jc drops when the ratio of YBCO additions increases, but in the Bi -2223 additions the trend goes just the opposite.