Processing of high performance (LRE)-Ba–Cu–O large, single-grain bulk superconductors in air

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

Superconductor Science and Technology ◽

10.1088/1361-6668/ac3670 ◽

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.

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The Influence of CeO2 Addition on Microstructure and Superconducting Properties of GdBCO-Ag Single Grain Bulk Superconductors

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.161697 ◽

2021 ◽

pp. 161697

Author(s):

Petra Hajdova ◽

Pavel Diko ◽

Michal Rajnak ◽

Jozef Bednarcik ◽

Vitaliy Antal ◽

...

Keyword(s):

Superconducting Properties ◽

Bulk Superconductors ◽

Single Grain ◽

Grain Bulk

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Use of $\mbox{Sm}\text{-}123 + \mbox{Sm}\text{-} 211$ Mixed-Powder Buffers to Assist the Growth of SmBCO and ZrO2-doped SmBCO Single Grain, Bulk Superconductors

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2014.2381855 ◽

2015 ◽

Vol 25 (3) ◽

pp. 1-5 ◽

Cited By ~ 5

Author(s):

Wen Zhao ◽

Yunhua Shi ◽

Anthony R. Dennis ◽

David A. Cardwell

Keyword(s):

Mixed Powder ◽

Bulk Superconductors ◽

Single Grain ◽

Grain Bulk

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Cracking in melt-grown RE–Ba–Cu–O single-grain bulk superconductors

Superconductor Science and Technology ◽

10.1088/0953-2048/17/11/r01 ◽

2004 ◽

Vol 17 (11) ◽

pp. R45-R58 ◽

Cited By ~ 68

Author(s):

P Diko

Keyword(s):

Bulk Superconductors ◽

Single Grain ◽

Grain Bulk

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The effect of very high barium content in the precursor on the properties of GdBCO single grain bulk superconductors

Journal of Materials Research ◽

10.1557/jmr.2009.0032 ◽

2009 ◽

Vol 24 (1) ◽

pp. 10-18 ◽

Cited By ~ 7

Author(s):

Yunhua Shi ◽

N. Hari Babu ◽

Kazumasa Iida ◽

David A. Cardwell

Keyword(s):

Melt Processing ◽

Processing Route ◽

Bulk Superconductors ◽

Single Grain ◽

High Concentrations ◽

New Processing ◽

Precursor Powders ◽

Grain Bulk ◽

First Time ◽

Very High

A new melt processing route for the fabrication of large grain Gd-Ba-Cu-O (GdBCO) bulk superconductors has been developed based on the use of novel GdBa4Cu3O8−δ (Gd-143) and GdBa6Cu3O10−δ (Gd-163) precursor compositions. The new processing route enables the fabrication of large single grains from precursor powders that contain high concentrations of Ba. The superconducting properties and microstructures of GdBCO single grains with extra Ba fabricated via this new processing route are reported. Most importantly, the possible formation of a new form of Gd1+xBa2−xCu3O7−δ solid solution (Gd-123ss) with x < 0 in single grains fabricated from the Ba-rich precursor are discussed for the first time based on the superconducting, chemical, and structural properties of the large GdBCO grains.

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