Characterization and superconducting properties of (Sm/Y)-Ba-Cu-O composite oxides by top-seeded melt growth in air

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Large single-grain (Sm/Y)(1.8)Ba2.4Cu3.4Oy [(Sm/Y)1.8] high T-c composite superconductors with/without CeO2 addition were systematically investigated by top-seeded melt growth (TSMG) process in air atmosphere. A melt-textured Nd1.8Ba2.4Cu3.4Oy (Nd1.8) single crystal was used as a seed for achieving the c-axis alignment large grains perpendicular to the surface of(Sm/Y)1.8 composite oxides. The size of(Sm/Y)(2)BaCuO5 [(Sm/Y)211] nonsuperconducting inclusions of the melt-textured (Sm/Y)1.8 samples with CeO2 addition were remarkably reduced and uniformly distributed within the (Sm/Y)Ba2Cu3Oy [(Sm/Y)123] matrix except in the region very close to the Nd1.8 seed crystal. In both samples, (Sm/Y)1.8 and (Sm/Y)1.8 with CeO2 addition, showed an onset T-c > 92 K and sharp transition. (C) 1999 Elsevier Science B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
1999-07
Language
English
Article Type
Article
Keywords

CRITICAL-CURRENT DENSITY; BA-CU-O; PROCESSED YBA2CU3OX; SINGLE-CRYSTALS; PTO2 ADDITIONS; CEO2 ADDITION; MICROSTRUCTURE; Y2BACUO5; SYSTEM; J(C)

Citation

JOURNAL OF CRYSTAL GROWTH, v.204, no.1-2, pp.78 - 84

ISSN
0022-0248
URI
http://hdl.handle.net/10203/68659
Appears in Collection
MS-Journal Papers(저널논문)
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