Scientific article
English

Deformation-induced texture in cold-rolled Ag sheathed Bi(2223) tapes

Published inPhysica C: Superconductivity and Its Applications, vol. 250, no. 1-2, p. 43-49
Publication date1995
Abstract

We have found that the Bi(2212) grains in unreacted Ag/Bi(2223) tapes at the end of the cold-rolling process show already a high degree of texture. X-ray diffraction analysis and current transport measurements at 77 K in magnetic fields up to 0.5 T have been performed before and after reaction on tapes with thicknesses in the range from 75 to 286 μm (filament thickness between 30 and 115 μm). The critical current density jc increases for smaller tape thicknesses, a maximum being found for a tape thickness of about 90 μm, below which sausaging effects are observed. The mean misalignment angles of Bi(2223) grains in these tapes have been determined by angle-dependent transport critical curent data at 77 K. We have found that the main reason for the enhancement of jc for thin tapes in due to the higher average texture of the Bi(2223) grains when compared to thick tapes. This is a direct consequence of the high degree of texture of Bi(2212) grains after the cold-rolling process, which has been observed here on 90 μm thick tapes with jc(77 K, 0 T) reaching between 25 and 30 kA/cm².

Citation (ISO format)
GRASSO, Giovanni, PERIN, Antonio, FLUKIGER, René-Louis. Deformation-induced texture in cold-rolled Ag sheathed Bi(2223) tapes. In: Physica C: Superconductivity and Its Applications, 1995, vol. 250, n° 1-2, p. 43–49. doi: 10.1016/0921-4534(95)00348-7
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Journal ISSN0921-4534
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