(RE)BCO coated conductors with BHO exhibiting promising in-field critical current performance up to fields of 31.2 T: a significant step forward towards the development of all (RE)BCO large field magnets

Namburi, Devendra Kumar

doi:10.1088/1361-6668/aba79f

Cited by 2 publications

(2 citation statements)

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“…The in-field performance of (RE)BCO coated conductors has improved by orders of magnitude over the past 20 years and through successful incorporation of BaZrO 3 (BZO) or BaHfO 3 (BHO) within the conductor microstructure to form effective flux pinning sites and hence improved superconducting performance [281,282]. For example, an engineering current density of over 5 kA mm −2 at 4.2 K and in a field of 14 T field has been achieved in 4 µm thick (RE)BCO coated conductor tapes and the performance has been observed to be promising up to fields of 31.2 T [231,283]. 2G-HTS coated conductors were used to develop superconducting solenoids in 2007 that generated fields of 26.8 T [284] (i.e.…”

Section: Superconducting Magnetsmentioning

confidence: 99%

The Processing and Properties of Bulk (Re)bco High Temperature Superconductors: Current Status and Future Perspectives

Namburi

Shi

Cardwell

2021

Supercond. Sci. Technol.

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Bulk (RE)-Ba-Cu-O [(RE)BCO] cuprate HTS have been developed steadily towards a wide range of sustainable engineering and technological applications since their discovery in 1986 based primarily on their unique potential to trap very large magnetic fields (>5 T) at temperatures that are accessible potentially by thermo-electric cooling techniques. Trapped fields of ∼10 T at the surface of individual (RE)BCO bulk single grains and in excess of 17 T in a reinforced two-sample stack are now being achieved reliably. This paper reviews the current state of the art of the processing of large, single grain (RE)BCO bulk superconductors required to trap fields of this magnitude, and specifically via two advanced fabrication approaches; the traditional TSMG process and the more recently developed TSIG technique. The focus of the review is on optimising the critical processing parameters to achieve high-quality, high performance single grain (RE)BCO bulk superconductors specifically for high-field applications. The review also summarises recent advances in processing, such as the integration of the so-called buffer technique into the TSMG and TSIG processing methodologies to achieve improved reliability in single grain growth with a success rate exceeding 90%, the development of a Mg-doped NdBCO generic seed crystal for the successful growth of all rare-earth and light-rare earth based bulk superconductors [(RE)BCO and (LRE)BCO] and the introduction of nano-size stable, non-superconducting phase(s) to the bulk microstructure to improve the intrinsic flux pinning strength of the material, and hence trapped magnetic field. Details of the two-step buffer-aided TSIG technique developed recently that yields dense, near-net shaped, high performance (RE)BCO bulk superconductors with improved superconducting and mechanical properties are also presented. Suitable sample-seed configurations for effective multi-seeding are discussed, which enables the production of high aspect ratio, bar-shaped (RE)BCO quasi-single grains that exhibit improved levitation forces required in Maglev-based applications, for example, are discussed. The electrical, mechanical, microstructural and magnetic properties (including those achieved from a pulsed-field magnetisation approach) of the different (RE)BCO systems are presented and the relevant correlation in properties and performance highlighted, accordingly. Finally, a brief summary of existing applications and prospects for near-future exploitation of these remarkable, technologically important materials, and particularly in the medical and pharma-industries, is provided.

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Section: Superconducting Magnetsmentioning

confidence: 99%

The Processing and Properties of Bulk (Re)bco High Temperature Superconductors: Current Status and Future Perspectives

Namburi

Shi

Cardwell

2021

Supercond. Sci. Technol.

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“…The discovery of growth of BaZrO 3 (BZO) nanorods by self-assembly in the REBa 2 Cu 3 O 7−δ (REBCO, RE = rare earth = Y and Gd) superconductors has had a profound impact on their in-field performance [1][2][3][4][5][6][7][8][9][10]. The nanorods grow forms 'spherical' or isotropically shaped RE 2 O 3 (REO) precipitates epitaxially oriented as REO(220)||REBCO (100), REO(004)||REBCO(001) [34], which further contribute to isotropic pinning.…”

Section: Introductionmentioning

confidence: 99%

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

Majkic

Jeong

Yun

et al. 2021

Supercond. Sci. Technol.

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We report on strain and composition effects associated with growth of self-assembled BaZrO 3 (BZO) nanorods in REBa 2 Cu 3 O 7−δ (REBCO) superconductors (RE = rare earth = Y and Gd), which have a profound effect on flux pinning and in-field critical current performance. The a-b plane mismatch between BZO and REBCO is never fully coherently accommodated. Instead, the nanorods always assume a size at least one unit cell smaller than the corresponding 'hole' in the REBCO matrix, thus providing deep minima of in-plane mismatch strain. Next, we show that the nominal BZO nanorods are in fact solid solution Ba 2+ (Zr 4+ 1−z RE 3+ z )O 3−δ perovskite, thus strongly affecting the stoichiometry and relative amounts of REBCO and BZO. We demonstrate that by varying only the Ba content in the nominal composition of 15 mol.% BZO + REBCO, the unit cell density of BZO can be tuned from 5% to 23%, and the linear density of RE 2 O 3 (REO) precipitates from 18 to 1 µm −1 . The results explain the wide range of pinning performances observed for the same nominal amount of Zr addition and provide insight into the mechanisms behind the complex phenomenon of growth of nanorods by self-assembly in REBCO superconductors.

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(RE)BCO coated conductors with BHO exhibiting promising in-field critical current performance up to fields of 31.2 T: a significant step forward towards the development of all (RE)BCO large field magnets

Cited by 2 publications

References 17 publications

The Processing and Properties of Bulk (Re)bco High Temperature Superconductors: Current Status and Future Perspectives

The Processing and Properties of Bulk (Re)bco High Temperature Superconductors: Current Status and Future Perspectives

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

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(RE)BCO coated conductors with BHO exhibiting promising in-field critical current performance up to fields of 31.2 T: a significant step forward towards the development of all (RE)BCO large field magnets

Cited by 2 publications

References 17 publications

The Processing and Properties of Bulk (Re)bco High Temperature Superconductors: Current Status and Future Perspectives

The Processing and Properties of Bulk (Re)bco High Temperature Superconductors: Current Status and Future Perspectives

New insight into strain and composition of BaZrO3 nanorods in REBCO superconductor

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New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor