scholarly journals Improved trapped field performance of single grain Y‐Ba‐Cu‐O bulk superconductors containing artificial holes

2021 ◽  
Author(s):  
K Y Huang ◽  
T Hlásek ◽  
D K Namburi ◽  
A R Dennis ◽  
Y Shi ◽  
...  
Keyword(s):  
Field Performance ◽  
Trapped Field ◽  
Bulk Superconductors ◽  
Single Grain

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

2016 ◽  
Vol 29 (8) ◽  
pp. 085009
Author(s):  
Tian-wei Tang ◽  
Dong-jie Wu ◽  
Ke-Xi Xu
Keyword(s):  
Trapped Field ◽  
Bulk Superconductors ◽  
Single Grain

scholarly journals The effect of size and aspect ratio on the trapped field properties of single grain, Y–Ba–Cu–O bulk superconductors

2019 ◽  
Vol 32 (2) ◽  
pp. 025005 ◽  
Author(s):  
Yunhua Shi ◽  
Anthony R Dennis ◽  
John H Durrell ◽  
David A Cardwell
Keyword(s):  
Aspect Ratio ◽  
Trapped Field ◽  
Bulk Superconductors ◽  
Single Grain

scholarly journals A robust seeding technique for the growth of single grain (RE)BCO and (RE)BCO–Ag bulk superconductors

2018 ◽  
Vol 31 (4) ◽  
pp. 044003 ◽  
Author(s):  
Devendra K Namburi ◽  
Yunhua Shi ◽  
Anthony R Dennis ◽  
John H Durrell ◽  
David A Cardwell
Keyword(s):  
Bulk Superconductors ◽  
Single Grain

A novel preform compaction method for fabricating high-performance Y–Ba–Cu–O single-grain bulk superconductor

2021 ◽  
Author(s):  
Guo-Zheng Li ◽  
Miao Wang
Keyword(s):  
High Performance ◽  
Sample Surface ◽  
Bulk Superconductor ◽  
Ybco Bulk ◽  
Trapped Field ◽  
Optical Micrograph ◽  
New Type ◽  
Single Grain ◽  
Grain Bulk ◽  
Compaction Method

Abstract A novel preform compaction method based on one new type of divisible mould was employed for fabricating single-grain YBCO bulk superconductor, which can complete the preform demoulding process through opening of the mould, rather than pushing the preform out in the regular mould. Thus it has natural superiority on eliminating macro-cracks, which has been proved by the sample surface morphology and the trapped field characterization. In addition, the divisible mould pressed sample exhibits higher levitation force and trapped field properties than the regular mould pressed samples, verifying the potentials of the divisible mould on improving the bulk performance. The optical micrograph results prove the superiority of the divisible mould on eliminating tiny cracks on sample surface. The processing facility and sample reliability brought by the divisible mould should also be emphasized, because the crushing and re-pressing of preform when it presents visible cracks can be omitted and the failed samples with surface cracks will no longer appear. Consequently, the experimental efficiency and stability are both enhanced.

scholarly journals Comparison of the effects of platinum and CeO2on the properties of single grain, Sm–Ba–Cu–O bulk superconductors

2016 ◽  
Vol 29 (12) ◽  
pp. 125002 ◽  
Author(s):  
Wen Zhao ◽  
Yunhua Shi ◽  
Monika Radušovská ◽  
Anthony R Dennis ◽  
John H Durrell ◽  
...  
Keyword(s):  
Bulk Superconductors ◽  
Single Grain

scholarly journals Characterisation of the mechanical failure and fracture mechanisms of single grain Y–Ba–Cu–O bulk superconductors

2019 ◽  
Vol 33 (1) ◽  
pp. 015003 ◽  
Author(s):  
Jasmin V J Congreve ◽  
Yunhua Shi ◽  
Kai Yuan Huang ◽  
Anthony R Dennis ◽  
John H Durrell ◽  
...  
Keyword(s):  
Mechanical Failure ◽  
Fracture Mechanisms ◽  
Bulk Superconductors ◽  
Single Grain

scholarly journals Trapped Field Properties of GdBaCuO Bulk Superconductors of Various Diameters Magnetized by Pulsed Fields Using an Identical Split Coil

2019 ◽  
Vol 29 (5) ◽  
pp. 1-5
Author(s):  
Fumiya Shimoyashiki ◽  
Hiroyuki Fujishiro ◽  
Tomoyuki Naito ◽  
Mark D. Ainslie
Keyword(s):  
Trapped Field ◽  
Bulk Superconductors ◽  
Pulsed Fields

Elimination of Oxygenation Cracking in YBCO Bulk Superconductors

2009 ◽  
Vol 409 ◽  
pp. 216-222
Author(s):  
Pavel Diko ◽  
Xavier Chaud ◽  
Vitaliy Antal ◽  
Mária Kaňuchová ◽  
Martina Šefčíková ◽  
...  
Keyword(s):  
Lattice Parameters ◽  
Oxygen Stoichiometry ◽  
Low Oxygen ◽  
Ybco Bulk ◽  
Oxygen Penetration ◽  
Thermal Expansion Coefficients ◽  
Bulk Superconductors ◽  
Single Grain ◽  
Expansion Coefficients ◽  
Crystal Lattice Parameters

The reasons for cracking of YBa2Cu3Oδ/Y2BaCuO5 (Y123/Y211 or YBCO) bulk single-grain superconductors are mechanical stresses, which arise in the sample during its fabrication. Two main sources of stresses appearing during fabrication were identified: the different thermal expansion coefficients of 123 and 211 phases and the dependence of 123 phase lattice parameters on the oxygen stoichiometry. As-grown YBCO bulks have low oxygen content, YBa2Cu3O6.3, are not superconducting, and must be oxygenated to form YBa2Cu3O7. During standard oxygenation at 400 °C the shortening of crystal lattice parameters causes intensive cracking. The created cracks allow oxygen penetration into the bulk and cause the oxygenation time to be technologically acceptable but reduce significantly the superconducting properties. Here we show that it is possible to eliminate the formation of oxygenation cracks and to reach a critical current density 2.5 times higher than in material bulk oxygenated in a standard way. The oxygenated crack-free samples were obtained by high pressure oxygenation with progressively increasing oxygen partial pressure.

scholarly journals Influence of Artificial Defects on Trapped Field Performance in a Superconducting Bulk Magnet

2017 ◽  
Vol 871 ◽  
pp. 012050
Author(s):  
K Yokoyama ◽  
K Eranda ◽  
Y Zhao ◽  
A Katsuki ◽  
A Miura ◽  
...  
Keyword(s):  
Field Performance ◽  
Trapped Field ◽  
Bulk Magnet

scholarly journals A trapped field of 14.3 T in Y–Ba–Cu–O bulk superconductors fabricated by buffer-assisted seeded infiltration and growth

2018 ◽  
Vol 31 (12) ◽  
pp. 125004 ◽  
Author(s):  
Devendra K Namburi ◽  
John H Durrell ◽  
Jan Jaroszynski ◽  
Yunhua Shi ◽  
Mark Ainslie ◽  
...  
Keyword(s):  
Trapped Field ◽  
Bulk Superconductors
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