Abstract
Basic and substituted superconductors in the homologous series Bi2Sr2Ca n−1Cu n O2n+4+y , Bi2−x/2Sr2−x/2L x Ca n−1Cu n O2n+4+y and Bi2Sr2−x L x Ca n−1Cu n O2n+4+y (L=Sn, Pb or Ag,x=0−0.4,n=2, 3 or 4) have been synthesized. All the prepared ceramic samples show superconducting behaviour with zero resistance atT c=70 to 85 K. The compounds withn=3 or 4 showed onset temperature around 115K indicating involvement of a disproportionate solid-state reaction and formation of a two-phase system. The phase involving tin or lead oxides showed similar superconducting properties. Final rapid quenching of samples contributed to preservation of the high temperature equilibria with higher solubility of tin oxide in the quaternary system Bi-Sr-Ca-Cu-O. Silver was not soluble but precipitated in a colloidal form at interfaces between the crystalline grains.
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Hanic, F., Plesch, G., Jergel, M. et al. Doping of Bi-Sr-Ca-Cu-O superconductors with Pb, Sn and Ag. Bull. Mater. Sci. 14, 309–314 (1991). https://doi.org/10.1007/BF02747334
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DOI: https://doi.org/10.1007/BF02747334