Title :
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
fDate :
6/1/1999 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
