Development of non-weak link bulk YBCO grain boundaries for high magnetic field engineering applications

Author

Wai Lo ; Cardwell, D.A. ; Bradley, A.D. ; Doyle, R.A. ; Shi, Y.H. ; Lloyd, S.

Author_Institution

Interdisciplinary Res. Centre in Supercond., Cambridge Univ., UK

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2042

Lastpage

2045

Abstract

A non-weak link joining technique has been developed for YBCO pseudo-crystals fabricated by seeded peritectic solidification based on the formation of a liquid phase which segregates from the platelet boundaries at temperatures above /spl ap/920/spl deg/C. Electrical and magnetic measurements on these boundaries suggest that their irreversibility field can be as high as 7 T at 77 K in fully oxygenated pseudo-crystals joined along their crystallographic ab-planes which is comparable to the irreversibility behaviour of the adjacent YBCO grains.

Keywords

barium compounds; grain boundaries; high-temperature superconductors; segregation; solidification; superconducting critical field; yttrium compounds; 7 T; 77 K; 920 C; YBCO pseudo-crystals; YBa/sub 2/Cu/sub 3/O/sub 7/; crystallographic ab-planes; electrical measurements; fully oxygenated pseudo-crystals; high magnetic field engineering application; irreversibility behaviour; irreversibility field; liquid phase; magnetic measurements; nonweak link bulk YBCO grain boundaries; nonweak link joining technique; platelet boundaries; seeded peritectic solidification; Crystalline materials; Crystallography; Grain boundaries; High temperature superconductors; Magnetic fields; Powders; Superconducting epitaxial layers; Superconducting materials; Superconductivity; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784866

Filename

784866