Advances in enlargement of melt-textured Gd–Ba–Cu–O superconductors

We investigated the fabrication of melt-textured Gd-Ba-Cu-O bulk superconductors with the employment of a Gd2BaO4 (Gd210)-BaCuO2-CuO precursor. This enabled us to synthesize a very large Gd-Ba-Cu-O bulk superconductor, 140 mm in diameter. The trapped field distribution measured at 77 K revealed that...

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Published in:Superconductor science & technology 2006-07, Vol.19 (7), p.S500-S505
Main Authors: Nariki, S, Sakai, N, Kita, M, Fujikura, M, Murakami, M, Hirabayashi, I
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description We investigated the fabrication of melt-textured Gd-Ba-Cu-O bulk superconductors with the employment of a Gd2BaO4 (Gd210)-BaCuO2-CuO precursor. This enabled us to synthesize a very large Gd-Ba-Cu-O bulk superconductor, 140 mm in diameter. The trapped field distribution measured at 77 K revealed that the sample had no serious cracks, and the maximum field was 2.3 T. The formation behaviour and depressing mechanism of cracking were studied using sintered Gd210-containing precursors. The Ba-Cu-O component in the precursor melted at around 900 deg C. The formation of such a liquid phase enhanced the densification of the precursor by liquid phase sintering. The mechanical strength of the sintered precursor was increased compared to the conventional Gd123-Gd211 precursor. This will be effective in preventing crack formation in the texturing process of large single-grain samples. The superconducting properties of the bulk sample fabricated from Gd210-containing precursor have been discussed.
doi_str_mv 10.1088/0953-2048/19/7/S15
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title Advances in enlargement of melt-textured Gd–Ba–Cu–O superconductors
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