Abstract
A powder-in-tube (PIT) process employing groove and flat rolling hasbeen successfully used for the fabrication of Bi2Sr2CaCu2Ox (Bi-2212)/Ag tapes. The tapes were melt processed at890 °C, which was followed by controlled cooling to 855 °C inorder to complete the phase formation. The effect of processing atmosphere(air versus oxygen) on the current transport properties, and microstructurewere studied. The average Jc at 4.2 K, self-field with 1 µV cm-1 criteria, was higher for tapes processed in oxygen(5×104 A cm-2) compared to tapes processed in air(6.25×103 A cm-2). Microstructural analysis on the heattreated tapes revealed that the oxygen processed tapes had a higher Bi-2212content, better grain alignment and smaller secondary phases compared to thetapes processed in air. Bubble defects, which severely deteriorate Ic of thetapes, were more pronounced for tapes processed in oxygen. TEM studies on theBi-2212-Ag interface illustrate the oxygen heat treated tapes to have sharpand straight interface compared to air processed tapes which exhibit atendency to facet in the direction of [0 0 1]/[2 0 6].
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