Abstract
For superconductors of type Bi-1212 the influence of substitution of (i) Pb for Bi (ii) rare earth elements (Ln) for Y and (iii) Ca for Y was studied. It is shown that a partial Pb→Bi substitution stabilizes the 1212 type and an incommensurate superstructure develops (λ≈4.8). Similar to the Y-123 case a Ln→Y substitution is working without destroying the superconductivity. The highest transition temperature of 90 K is obtained with a combined Ca→Y and Pb→Bi substitution in materials of composition (Bi, Pb, Cu) Sr 2 (Y, Ca) Cu 2O 7- z . Bi-based 1212 powdered materials are characterized by non-superconducting grain boundaries, resulting in a pronounced weak link behavior. This situation can be improved by introducing an intermediate step of partial or total melting in the conditions of preparation.
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