Fabrication, metallurgical characterization and superconducting properties of Pb- and SnMo6S8tapes

Chevrel phase superconducting Pb- and SnMo6S8tapes were produced by a solid (Mo)-vapor (Pb or Sn and S) reaction process. The superconducting critical temperatures Tcfor the compounds, which were formed by this process, were 14.8 and 14.7 K with the transition width of 0.2 K for PbMo6S8and 0.5 K for SnMo6S8, respectively. The best superconducting critical current densities for the PbMo6S8tapes were 1.5×10⁸A/m²and 6×10⁷A/m²at 10 and 19 T, respectively. The dependence of Tcon the processing conditions and the results of metallurgical characterization of these compounds are discussed.