Fabrication of dense Ba2YCu3O7-δ superconductor wire by molten oxide processing

Jin, S.; Tiefel, T. H.; Sherwood, R. C.; Kammlott, G. W.; Zahurak, S. M.
September 1987
Applied Physics Letters;9/21/1987, Vol. 51 Issue 12, p943
Academic Journal
Fabrication of high Tc ceramic superconductors by an oxide melting method in place of a conventional sintering method has been attempted. Using three different processes, i.e., melt drawing, melt spinning, or preform-wire melting, it is demonstrated that the Ba2YCu3O7-δ type superconductors can successfully be fabricated into a desired geometry such as wire and ribbon. Tc’s for R=0 were about 92 K. The density of the melt-processed compound was measured to be as high as 6.2 g/cm3, or ∼98% of the theoretical density 6.3 g/cm3 as compared to the value of 80–85% density for sintered samples. The increased density is likely to be responsible for the noted improvements in fracture resistance and in the Jc value of the melt-processed compound.


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