A Comparison of 0°–0° and 45°–45° bridge‐Seeded, <scp>YBCO</scp> single grains

Shi, Yunhua; Durrell, John; Dennis, Anthony; Zhang, Zhiwei; Zhai, Wei; Babu, Nadendla Hari; Cardwell, D. A.

doi:10.1111/jace.12350

Cited by 14 publications

(33 citation statements)

References 32 publications

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“…The shape of the trapped field distribution from PFM is determined by the length of bridge seeds and the boundary generated during the growth process. These results also agree with the experimental data presented previously in [19][20][21].…”

Section: Comparison Of Experimental and Numerical Simulation Resultssupporting

confidence: 93%

“…Precursor powders of YBa 2 Cu 3 O 7 (Y-123), Y 2 BaCuO 5 (Y-211) and Pt (99% purity) with a starting composition of 70 wt% Y-123 + 30 wt% Y-211 + 0.1 wt% Pt were mixed thoroughly using a motorized mortar and pestle [21]. The mixed powder was pressed uniaxially into pellets of diameter 32 mm and thickness 20 mm.…”

Section: Melt-processing Of Multi-seed Bulk Samples Using 45⁰-45⁰ Andmentioning

confidence: 99%

“…However, as shown in Figure 3, the grain boundaries created by using a 45⁰-45⁰ seeds has a less significant effect on the overall trapped field when magnetized by FC. An impurity-free boundary can be engineered between the two seed legs of the bridge when 45⁰-45⁰ bridge seeds are used to enlarge YBCO single grains [21]. Since in the numerical simulation a more ideal case needs to be considered and we need to deduce the influence of boundary effects in the model, the 45⁰-45⁰ multi-seed sample at 65 K is used as an example to carry out the numerical analysis in this section.…”

Section: Numerical Simulationmentioning

confidence: 99%

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Pulsed field magnetization of 0°–0° and 45°–45° bridge-seeded Y–Ba–Cu–O bulk superconductors

Ainslie

Zeng

Mochizuki

et al. 2015

Supercond. Sci. Technol.

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Large, single-grain (RE)BCO (where RE = rare earth or Y) bulk superconductors with complicated geometries are required for a variety of potential applications, such as rotating machines, magnetic bearings and magnetic separation. As a consequence, the top multiseeded melt growth process has been studied over many years in an attempt to deliver large, single grains for practical applications. Among these techniques, the so-called bridgeseeding produces the best alignment of two seeds during melt processing of multi-seed samples. In this paper, the trapped field performance and magnetic flux dynamics of two bridge-seeded, multi-seed samples magnetized by pulsed field magnetization (PFM) are analysed: one with a 45⁰-45⁰ and another with a 0⁰-0⁰ bridge seed. Based on an analysis of the flux penetration across the seeds and in-between the seeds of the 45⁰-45⁰ multi-seed sample, an estimated J c distribution over the ab-plane was determined, which provides the basis for further analysis via numerical simulation. A 3D finite-element model, developed to qualitatively reproduce and interpret the experimental results, was employed to investigate the influence of the length of the bridge seed for such multi-seed samples. The simulation results agree well with the observed experimental results, in that the multi-seed sample's particular inhomogeneous J c distribution acts to distort the trapped field profile from a traditional conical Bean's profile, which is determined by the length and direction of the bridge seed on the bulk surface.Keywords: bulk superconductors, multi-seeding, bridge-shaped seeds, trapped field magnets, pulsed field magnetization, numerical modelling, finite element method (FEM) modelling c c c J J J x y z J J J J    .

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Section: Comparison Of Experimental and Numerical Simulation Resultssupporting

confidence: 93%

Section: Melt-processing Of Multi-seed Bulk Samples Using 45⁰-45⁰ Andmentioning

confidence: 99%

Section: Numerical Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Pulsed field magnetization of 0°–0° and 45°–45° bridge-seeded Y–Ba–Cu–O bulk superconductors

Ainslie

Zeng

Mochizuki

et al. 2015

Supercond. Sci. Technol.

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show abstract

“…non-bridge) seeds. A detailed comparison between melt processes using 0 • -0 • and 45 • -45 • bridge seeds has been reported by Shi et al [17]. This clarified that the 45 • -45 • bridge seeding results in cleaner grain boundaries in comparison with 0 • -0 • bridge seeds.…”

Section: Introductionmentioning

confidence: 62%

“…Seeding techniques have been employed to grow YBCO single grains [16] with both 0 • -0 • and 45 • -45 • orientations of the seed. Here, for instance, 0 • -0 • represents the angles between the direction of the long axis of a bridge seed and the a direction [corresponding to the (100) direction for the tetragonal YBCO phase] of the two seeds, respectively [16,17]. The bridge technique has enabled significant improvement in the alignment of the seeds and has eliminated the sharp decrease in trapped field observed at the centre of YBCO bulk superconductors fabricated using independent (i.e.…”

Section: Introductionmentioning

confidence: 99%

Processing and Properties of Bar-Shaped Single-Seeded and Multi-Seeded YBCO Bulk Superconductors by a Top-Seeded Melt Growth Technique

Almalki

Namburi

Ba-Abbad

et al. 2016

J Supercond Nov Magn

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The fabrication of (RE)-Ba-Cu-O bulk superconductors, where RE is a rare-earth element such as Y, Gd and Sm, is both time consuming and expensive due to the complexity of the melt process and the slow growth rate of large, single grains. In this study, different approaches to the fabrication of bar-shaped, bulk YBCO superconductors are investigated and compared using single-and multipleseeding techniques via top-seeded melt growth (TSMG). Both the microstructural and superconducting properties of the bulk samples are investigated, including trapped field, critical current density, critical temperature and levitation force. The results of this study indicate that, in general, the superconducting properties of YBCO fabricated by a singleseeded process are significantly better than those of samples fabricated by a four-seeded process for non-bridge seeds. The differences between the samples are less pronounced in the levitation force measurements, however. In this paper, we attempt to explain the reasons for the similarities and differences observed between bulk samples fabricated by the different single-and multi-seeded processes.

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Synthesis of High-Tc Oxide Superconductors

Kim

2019

Superconductor Levitation

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

Cited by 14 publications

References 32 publications

Pulsed field magnetization of 0°–0° and 45°–45° bridge-seeded Y–Ba–Cu–O bulk superconductors

Pulsed field magnetization of 0°–0° and 45°–45° bridge-seeded Y–Ba–Cu–O bulk superconductors

Processing and Properties of Bar-Shaped Single-Seeded and Multi-Seeded YBCO Bulk Superconductors by a Top-Seeded Melt Growth Technique

Synthesis of High-Tc Oxide Superconductors

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