On the mechanisms of J c increment and degradation in high-J c Ba122 tapes made by different processing methods

Kametani, F.; Su, Y.; Tarantini, C.; Hellstrom, E.; Matsumoto, A.; Kumakura, H.; Togano, K.; Huang, H.; Ma, Y.

doi:10.35848/1882-0786/ad1891

Title: On the mechanisms of J _c increment and degradation in high-J _c Ba122 tapes made by different processing methods

Journal Article · 07 January 2024 · Applied Physics Express

DOI: https://doi.org/10.35848/1882-0786/ad1891 · OSTI ID:2279102

; Su, Y.;

; Hellstrom, E.;

; Kumakura, H.; Togano, K.; Huang, H.; Ma, Y.

Abstract We compared the grain and grain boundary (GB) nanostructures in two Ba122 tapes with similarly high J _c . The Ag-sheathed tape made by hot pressing has larger, more plate-like grains with better c -axis alignment but has more GBs blocked by FeAs and Ba–O. In contrast, the tape made by cold pressing with an Ag-Sn/stainless steel sheath possesses fewer plate-like grains and weaker grain alignment but has more continuous current paths with clean physically well-connected GBs. Our nanostructural comparison emphasizes the strong need to achieve both good grain alignment and clean GBs for further J _c improvement of Ba122 tapes.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: US National Science Foundation; USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0018750

OSTI ID:: 2279102

Journal Information:: Applied Physics Express, Journal Name: Applied Physics Express Journal Issue: 1 Vol. 17; ISSN 1882-0778

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: Japan

Language:: English

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