A simple multi-seeding approach to growth of large YBCO bulk with a diameter above 53 mm

Tang, Tian-wei; Wu, Dong-jie; Wu, Xingda; Xu, Kun

doi:10.1016/j.physc.2015.10.009

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…The single grain YBCO bulks were grown by TSMTG with a cold-seeding method using SmBCO seed crystals cleaved along the a-b plane and placed at the center of the upper surface of each pellet. Generic SmBCO seed crystals were manufactured as described elsewhere [35].…”

Section: Preparation Of Precursor Pelletsmentioning

confidence: 99%

Enhancement of trapped field in single grain Y–Ba–Cu–O bulk superconductors by a modified top-seeded melt-textured growth

Tang

2016

Supercond. Sci. Technol.

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The modified top-seeded melt-textured growth technique for fabricating single grain Y–Ba–Cu–O (YBCO) bulk superconductors with high field-trapping ability by using modified precursor pellets was reported. The modified precursor pellets are composed of different precursor powders YBa2Cu3O (Y123) + x mol% Y2BaCuO5 (Y211) + 1 wt% CeO2 without any further chemical doping. The modified YBCO bulks up to 25 and 34 mm in diameter were successfully fabricated from the modified precursor pellets. Microstructural observation results showed that the modified YBCO bulk exhibited a homogeneous distribution of Y211 phase particles, which was qualitatively explained by the solute diffusion growth model in combination with the trapping/pushing theory. As a result, it is notable that the peak trapped field values of 0.91 T (maximum 0.96 T) and 1.2 T (maximum 1.28 T) at 77 K were achieved for 25 and 34 mm modified YBCO bulks, respectively. In a word, the results from present work are very helpful to understand the melt growth mechanism and to further improve the properties of YBCO bulk superconductors for practical applications.

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Section: Preparation Of Precursor Pelletsmentioning

confidence: 99%

Enhancement of trapped field in single grain Y–Ba–Cu–O bulk superconductors by a modified top-seeded melt-textured growth

Tang

2016

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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“…To minimize the contamination of the bulk by the seed crystal and raise the maximum processing temperature ( T max ), the buffer layer was used in the process of the fabrication REBCO superconductor bulks. − A buffer layer was first used in the cold-seeding process by Li et al, and a large-sized GdBCO bulk with a diameter of 56 mm was fabricated successfully . Subsequently, this buffer layer technology has been widely developed and used, especially in the batch preparation of superconductor. − It is worth mentioning that the optimum aspect ratio ( r / h = 1) of the buffer pellet was obtained by Shi et al For fabrication of larger REBCO superconductor bulks, the multi-seed technology was invented. − Multi-seeds have been adopted for the growth of large REBCO bulk, , such as Sakai et al fabricated a large GdBCO superconductor bulk 140 mm in diameter with the multi-seeds method . Tang et al.…”

Section: Introductionmentioning

confidence: 99%

“…20−22 It is worth mentioning that the optimum aspect ratio (r/h = 1) of the buffer pellet was obtained by Shi et al 20 For fabrication of larger REBCO superconductor bulks, the multi-seed technology was invented. 23−26 Multi-seeds have been adopted for the growth of large REBCO bulk, 24,25 such as Sakai et al fabricated a large GdBCO superconductor bulk 140 mm in diameter with the multi-seeds method. 24 Tang et al reported that a large YBCO bulk with a diameter above 53 mm was fabricated by the multiseeds method.…”

Section: Introductionmentioning

confidence: 99%

“…24 Tang et al reported that a large YBCO bulk with a diameter above 53 mm was fabricated by the multiseeds method. 25 Shi et al proposed the buffer-aided-bridgeseeding technique for the growth of multi-seeded single grain (RE)BCO superconductors only using one seed crystal, which is also significant for growing large-sized superconductors. 26 However, it is seldom found any work focused on how to fabricate several single domain REBCO bulk superconductors only with one seed.…”

Section: Introductionmentioning

confidence: 99%

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A New Method for Batch Production of Single Domain GdBCO Bulks of Different Growth Sectors Using One Seed by the RE+011 TSIG Process

Shen

Yang

2020

Crystal Growth & Design

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A single domain REBCO bulk, fabricated with one seed whether by the top seeded melt growth method or top seeded infiltration growth (TSIG) process, consists of five growth sectors (GSs) generally. In this paper, we report a new method for batch production of single domain GdBCO bulks with one seed, but of different growth sectors (n-GSs, n = 2, 3, 5) by the RE+011 TSIG process. It is found that four single domain GdBCO bulks with 2-GSs and 3-GSs can be fabricated with a buffer added one seed method. The levitation forces and trapped fields indicate that the physical properties of samples decrease with the decreasing of the n-GSs, such as the largest levitation force and trapped field is achieved in the sample with 5-GSs, the smallest one is obtained in the sample with 2-GSs, and the middle one is obtained in the sample with 3-GSs. This is closely related to the number n of GSs which can lead to a different thickness of n-GSs and the pure c-GSs; these results have been studied in detail. This work provided a new effective way to improve the seed efficiency for the fabrication of single domain REBCO bulk superconductors.

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A simple multi-seeding approach to growth of large YBCO bulk with a diameter above 53 mm

Cited by 6 publications

References 13 publications

Enhancement of trapped field in single grain Y–Ba–Cu–O bulk superconductors by a modified top-seeded melt-textured growth

Enhancement of trapped field in single grain Y–Ba–Cu–O bulk superconductors by a modified top-seeded melt-textured growth

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

A New Method for Batch Production of Single Domain GdBCO Bulks of Different Growth Sectors Using One Seed by the RE+011 TSIG Process

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