Abstract
The critical current density at 77 K at 0 T and the tensile strength at room temperature of high T c Bi(Pb)SrCaCuO and YBaCuO oxides in silver-sheathed tapes prepared by the powder-in-tube method were investigated. The main results can be summarized as follows. (1) The critical current density and the strength of both oxides increased with decreasing thickness. (2) The strength of the Bi(Pb)SrCaCuO oxide was 120 MPa at most, being comparable to that of the YBaCuO oxide, but far lower than that of Nb 3Sn compound. (3) When the oxides were weak, the higher the strength, the higher was the current density in both YBaCuO and Bi(Pb)SrCaCuO tapes. The textured structure in the Bi(Pb)SrCaCuO tape with thin oxide raised current density effectively, while it raised the strength only slightly.
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