The effect of seed orientation and separation on the field trapping properties of multi-seeded, melt processed Y–Ba–Cu–O

Withnell, T.D.; Babu, N. Hari; Iida, K.; Shi, Yongjiang; Cardwell, D. A.; Haindl, S.; Hengstberger, F.; Weber, H.W.

doi:10.1016/j.physc.2006.04.023

Cited by 17 publications

(19 citation statements)

References 6 publications

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“…and Withnell et al . pioneered the “bridge seeding technique”, in which a bridge‐shaped seed is used to achieve improved alignment of the two seeds during the entire melt process. The technique works because the two seeds (i.e., the two legs of the bridge) are cut notionally from a single parent grain, which is also fabricated by melt processing.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of 0°–0° and 45°–45° bridge‐Seeded, YBCO single grains

et al. 2013

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A variety of multiseeding techniques have been investigated over the past 20 yr in an attempt to enlarge bulk (RE)BCO superconducting samples fabricated by the top-seeded melt growth (TSMG) process for practical applications. Unfortunately, these studies have failed to establish whether technically useful values of trapped field can be achieved in multiseeded bulk samples. In this work specially designed, 0°-0°and 45°-45°bridge seeds of different lengths have been employed to produce improved alignment of the seeds during the TSMG process. The ability of these bridge-seeded samples to trap magnetic field, which is the key superconducting property for practical applications of bulk (RE)BCO, is compared for the samples seeded using 0°-0°and 45°-45°bridge seeds of different lengths. The grain boundaries produced by these bridge seeds are analyzed in detail, and the similarities and differences between the two bridge-seeding processes are discussed.

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Section: Introductionmentioning

confidence: 99%

A Comparison of 0°–0° and 45°–45° bridge‐Seeded, YBCO single grains

et al. 2013

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“…In an earlier study, the trapped field of a multi-grain sample processed with mis-oriented seeds, (e.g. for ), revealed the weak-link nature of the GB [7]. Fig.…”

Section: Resultsmentioning

confidence: 79%

“…A multi-seeding technique has been used successfully to produce weak-link free GBs in (RE)-Ba-Cu-O from two or more various RE-Ba-Cu-O layers with different peritectic temperatures [10]. In our previous study [7], the effects of seed orientation on the formation of grain boundaries and the homogeneity of multi-seeded YBCO samples was observed to correlate with the angle between the growth sectors, with even small angles of intersection producing significant minima in the trapped field profile in the region of the GB. In this study, we report the fabrication of a range of large, multi-grain bulk superconductors using a multi-seeding technique and investigate the microstructure, field trapping ability and critical current density nature of the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Strongly Coupled Artificial Bulk HTS Grain Boundaries With High Critical Current Densities

Babu

Withnell

Iida

et al. 2007

IEEE Trans. Appl. Supercond.

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A multi-seeding process has been developed to fabricate single Y-Ba-Cu-O (YBCO) grains containing strong artificial grain boundaries. Multi-seeding of heterogeneous YBCO grains with controlled orientation was achieved using large Sm-Ba-Cu-O (SmBCO) single crystal seeds of rod-like geometry with slots of various widths (up to 13 mm) cut into their bottom surface (i.e. parallel to the c-axis of the seed) to produce a bridge-like structure. Several YBCO grains with artificial grain boundaries were fabricated from these seed crystals and used to investigate the effect of varying the distance between the individual grain nucleation sites and the grain orientation (in-plane and out of plane) on the nature of grain boundaries. The measured local magnetic critical current density (J c) and the magnitude of the trapped field across these artificial grain boundaries indicate that seed alignment is a key parameter in achieving strongly-coupled grain boundaries in multi-seeded grains.

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“…The results show that the residual melt at (1 0 0)/(1 0 0) grain boundaries increases with increasing inter-seed distance, leading to the formation of a weak link (weakly-superconducting regions) at the grain boundary. Moreover, the trapped magnetic field has been reported to degrade as the number of seeds increases due specifically to the poor connection of each domain [144][145][146][147]. These results suggest that an optimized process is needed to improve the connectivity between grains for a multi-seeding growth process using more than two seeds.…”

Section: Thermal Stability Of Film-seed In Low Supersaturated Melt Fomentioning

confidence: 99%

Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

Chen

Cui

Yao

2015

Progress in Materials Science

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The effect of seed orientation and separation on the field trapping properties of multi-seeded, melt processed Y–Ba–Cu–O

Cited by 17 publications

References 6 publications

A Comparison of 0°–0° and 45°–45° bridge‐Seeded, YBCO single grains

A Comparison of 0°–0° and 45°–45° bridge‐Seeded, YBCO single grains

Strongly Coupled Artificial Bulk HTS Grain Boundaries With High Critical Current Densities

Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

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