Influence of grain boundary connectivity on the trapped magnetic flux of multi-seeded bulk superconductors

Deng, Zigang; Miki, M.; Felder, B.; Tsuzuki, K.; Shinohara, Nobuyuki; Hara, Shogo; Uetake, T.; Izumi, Mitsuru

doi:10.1016/j.physc.2011.06.001

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…As we know that the samples S2 and S3 have similar characteristics in terms of geometric dimension and number of seeds, as well as virtually the same average size and similar distribution of Y-211 particles, thus, differences in the shape and spatial configuration of their Y-123 grains may lead to the differences in the properties of samples S2 and S3. In other words, the better coupling between Y-123 grains in the sample S3 optimizes the performance near the GB, and the enhancement around the GB can also be evaluated by the coupling ratio between two independent single-domain grains [34]. From the figure 5(b) we can see that see that the coupling ratio is 44.2%, 52.1% and 65.1% for the samples S1, S2 and S3, respectively, which indicates that the coupling ratio can be well improved by the IT-MS method.…”

Section: Trapped Fieldmentioning

confidence: 99%

A novel interior seed addition to improve the levitation force and the trapped field of multi-seeded YBCO bulk superconductors

Abulaiti,

Wan-Min

2023

Supercond. Sci. Technol.

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Top multi-seeded technique (TMS) is a cost-effective and time-saving method in fabricating larger size high-quality REBCO bulk superconductors. However, the physical properties of the samples prepared by the TMS technique are clearly reduced compared to the single domain samples, especially around the grain boundaries between the neighboring grains. Here we have proposed a novel Inner-Top Multiple-Seeding (IT-MS) technique, which can be used to design and optimize the shapes and space configuration of the single-domain YBCO grains, so as to improve the physical properties of multi-seeded REBCO bulk sample. These have been verified with 60 × 20 × 13 mm3 parallelepiped YBCO bulk superconductors. The levitation force of 112.8 N (77 K, 0.5 T) is achieved in the sample prepared by the IT-MS method with two top seeds and one interior seed, which is 25.2% and 16.9% higher than that of the samples prepared using the TMS method with only two and three top seeds. The trapped field of the IT-MS sample is not only higher than that of the TMS sample, but also the magnetic field coupling ratio is significantly enhanced from 44.2% to 65.1%. The results indicate that the IT-MS technique is helpful to improve the physical properties and homogeneities of the multi-seeded YBCO bulk samples, especially effective for the fabrication of high-quality larger size REBCO bulk superconductors.

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Section: Trapped Fieldmentioning

confidence: 99%

A novel interior seed addition to improve the levitation force and the trapped field of multi-seeded YBCO bulk superconductors

Abulaiti,

Wan-Min

2023

Supercond. Sci. Technol.

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“…This is because non-superconducting-phase (RE 2 BaCuO 5 , CuO, Ba-Cu-O) areas formed in GBs significantly deteriorate superconducting junctions between crystal domains. In other words, critical current densities (J c ) across boundaries between multiple-seed domains are reduced [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. However, the multi seeded seamless bulk (MUSLE) technique can reduce or eliminate these non-superconducting phase areas formed in GBs.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of magnetic levitation forces for bulk superconductors with different superconducting junctions between multiple-seed-growth domains

Sawamura¹,

Izumi²

2021

Supercond. Sci. Technol.

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We studied magnetic levitation forces for bulk superconductors through numerical analysis. We virtually varied the superconducting junctions between domains formed through multiple seeding (four seeds) and investigated the effect of the following parameters on the magnetic levitation force: (1) the critical current density J c across grain boundaries (GBs) or superconducting junctions between crystal domains. J c across GBs was varied from 0% to 100% of the base material’s J c and (2) the depth of the insulation phase (0% of the base material’s J c ) formed between domains. For parameters in (a), we found that in the presence of superconducting junctions between crystal domains with less than 50% for the ratio of J c to the base materials’ J c , the magnetic levitation force decreased significantly under the conditions where the superconducting bulk and the permanent magnet face each other like this study. Furthermore, for 100% of the base J c , the largest levitation force was generated by the first layer (0–1 mm thick), while with a reduced superconducting junction (25% of J c to 0% of J c ), the deeper layers also contributed to the levitation force. For the parameters in (2), even a thin insulation phase layer between crystal domains significantly affected the magnetic levitation force, and different bulk layers (each 1 mm thick) below the insulation phase showed different levels of contribution to the levitation force.

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“…In this paper we address systematically, within the context of previous work, − ,,− the factors that affect the growth of multiseeded, bulk superconducting grains. These include the distance between seeds, the seed and buffer layer combination, and seed alignment.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Growth of Multiseeded Superconducting Single Grains

Shi

Dennis

Zhou

et al. 2016

Crystal Growth & Design

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Single grain, rare earth-barium-copper oxide [(RE)BCO] bulk superconductors, fabricated either individually or assembled in large or complicated geometries, have significant potential for a variety of potential engineering applications. Unfortunately, (RE)BCO single grains have intrinsically very low growth rates, which limits the sample size that may be achieved in a practical, top seeded melt growth (TSMG) process. As a result, a melt process based on the use of two or more seeds (so-called multi-seeding) to control the nucleation and subsequent growth of bulk (RE)BCO superconductors has been developed to fabricate larger samples and to reduce the time taken for the melt process. However, the formation of regions that contain non-superconducting phases at grain boundaries has emerged as an unavoidable consequence of this process. This leads to the multi-seeded sample behaving as if it is composed of multiple, singly seeded regions. In this work we have examined the factors that lead to the accumulation of non-superconducting phases at grain boundaries in multi-seeded (RE)BCO bulk samples. We have studied the microstructure and superconducting properties of a number of samples fabricated by the multi seeded process to explore how the severity of this problem can be reduced significantly, if not eliminated completely. We conclude that, by employing the techniques described, multi-seeding is a practical approach to the processing of large high performance superconducting bulk samples for engineering applications.

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Influence of grain boundary connectivity on the trapped magnetic flux of multi-seeded bulk superconductors

Cited by 6 publications

References 16 publications

A novel interior seed addition to improve the levitation force and the trapped field of multi-seeded YBCO bulk superconductors

A novel interior seed addition to improve the levitation force and the trapped field of multi-seeded YBCO bulk superconductors

Numerical analysis of magnetic levitation forces for bulk superconductors with different superconducting junctions between multiple-seed-growth domains

Factors Affecting the Growth of Multiseeded Superconducting Single Grains

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