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Keywords:

  • Superconductivity;
  • Bi cuprates;
  • Magnetic properties

Abstract

From a study of the influence of the Ca: Pb ratio on the superconducting properties of Bibased ceramics of 2223 type it follows that as a second parameter the employed gas atmosphere must be taken into consideration. In case of air preparation good intragrain and intergrain properties are obtained for Ca rich samples (e.g. Bi1.8Pb0.2Sr1.9Ca2.1 Cu3Oz); whereas for Pb rich materials (e.g. Bi1.7Pb0.5Sr1.9Ca1.9 Cu3Oz) improved conditions are encountered by employment of an Ar/O2 (8%) atmosphere during synthesis. Independently, the transition temperature is situated near 108 K.