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Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn

Title: Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn.
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Name(s): Tarantini, C., author
Sung, Z.-H., author
Lee, P. J., author
Ghosh, A. K., author
Larbalestier, D. C., author
Type of Resource: text
Genre: Text
Date Issued: 2016-01-25
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Nb3Sn wire is now very close to its final optimization, but despite its classical nature, a detailed understanding of the role of Ta and Ti doping in the A15 is not fully developed. Long thought to be essentially equivalent in their influence on H-c2, they were interchangeably applied. Here, we show that Ti produces significantly more homogeneous chemical and superconducting properties. Despite Ta-doped samples having a slightly higher T-c onset in zero-field, they always have a wider T-c-distribution. In particular, whereas the Ta-doped A15 has a T-c-distribution extending from 18 down to 5-6 K (the lowest expected T-c for the binary A15 phase), the Ti-doped samples have no A15 phase with T-c below similar to 12 K. The much narrower T-c distribution in the Ti-doped samples has a positive effect on their in-field T-c-distribution too, leading to an extrapolated mu H-0(c2)(0) 2 T larger than the Ta-doped wire. Ti-doping also appears to be very homogeneous even when the Sn content is reduced in order to inhibit breakdown of the diffusion barriers in very high J(c) conductors. The enhanced homogeneity of the Ti-doped samples appears to result from its assistance of rapid diffusion of Sn into the filaments and by its incorporation into the A15 phase interchangeably with Sn on the Sn sites of the A15 phase. (C) 2016 AIP Publishing LLC.
Identifier: FSU_libsubv1_wos_000375217200044 (IID), 10.1063/1.4940726 (DOI)
Keywords: fields, parameters, wires
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1063/1.4940726
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000375217200044
Host Institution: FSU
Is Part Of: Applied Physics Letters.
0003-6951
Issue: iss. 4, vol. 108

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Tarantini, C., Sung, Z. -H., Lee, P. J., Ghosh, A. K., & Larbalestier, D. C. (2016). Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn. Applied Physics Letters. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000375217200044