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

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

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

2006 ◽  
Vol 445-448 ◽  
pp. 286-290 ◽  
Author(s):  
N. Hari Babu ◽  
K. Iida ◽  
Y. Shi ◽  
D.A. Cardwell
Keyword(s):  
High Performance ◽  
Bulk Superconductors ◽  
Single Grain ◽  
Grain Bulk

Mg-doped Nd-Ba-Cu-O generic seed crystals for the top-seeded melt growth of large-grain (rare earth)-Ba-Cu-O bulk superconductors

2006 ◽  
Vol 21 (6) ◽  
pp. 1355-1362 ◽  
Author(s):  
Y. Shi ◽  
N. Hari Babu ◽  
K. Iida ◽  
D.A. Cardwell
Keyword(s):  
Rare Earth ◽  
Volume Fraction ◽  
Seed Crystal ◽  
Superconducting Properties ◽  
Seed Crystals ◽  
Bulk Superconductors ◽  
Wide Range ◽  
Single Grain ◽  
Basic Characteristics ◽  
Mg Doped

We report the fabrication of Mg-doped NdBCO generic seed crystals, which have been developed recently for the fabrication of any rare earth (RE) based (RE)-Ba-Cu-O single-grain superconductor, with a wide range of Nd1+xBa2-xCu3-yMgyO7-δ compositions. Three basic characteristics of the seed crystals required for effective seeding of bulk (RE)BCO materials were studied in detail. We report the chemical, crystallographic, microstructural, and superconducting properties of the seeds and demonstrate clearly their potential to process various (RE)BCO superconductors in single-grain form. The melting point, volume fraction of Mg-rich inclusions in the bulk microstructure, and the chemical composition of the Nd1+xBa2-xCu3-yMgyO7-δ superconducting matrix of the seed crystals were studied as a function of initial MgO content. Finally, the suitable range of MgO-content within the generic seed crystal that controls effectively the orientation of the seeded grain without compromising its superconducting properties relative to those of the Mg-free compound is identified based on the wide range of seed crystal compositions investigated.

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

2009 ◽  
Vol 24 (1) ◽  
pp. 10-18 ◽  
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.

A simple method for recycling GdBCO–Ag single grain bulk superconductors

2011 ◽  
Vol 24 (7) ◽  
pp. 075010 ◽  
Author(s):  
Y Shi ◽  
A R Dennis ◽  
F Hengstberger ◽  
N Hari Babu ◽  
D A Cardwell ◽  
...  
Keyword(s):  
Simple Method ◽  
Bulk Superconductors ◽  
Single Grain ◽  
Grain Bulk

scholarly journals The use of buffer pellets to pseudo hot seed (RE)–Ba–Cu–O–(Ag) single grain bulk superconductors

2015 ◽  
Vol 29 (1) ◽  
pp. 015010 ◽  
Author(s):  
Yunhua Shi ◽  
Devendra Kumar Namburi ◽  
Wen Zhao ◽  
John H Durrell ◽  
Anthony R Dennis ◽  
...  
Keyword(s):  
Bulk Superconductors ◽  
Single Grain ◽  
Grain Bulk
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