Title :
Fabrication of a good-quality single grain YBCO sample through the control of seed crystals
Author :
Kim, Chan-Joong ; Hong, Gye-Won ; Jee, Young A. ; Han, Young-Hee ; Han, Sang-Chul ; Sung, Tae-Hyun
Author_Institution :
Supercond. Res. Lab., Korea Atomic Energy Res. Inst., Taejon, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
We investigated the growth mode of YBa2Cu3O 7-y (Y123) grains and its effect on the levitation forces and trapped magnetic field of top-seeded melt processed YBCO samples. When a slab-like Sm-seed was used, undesirable subsidiary Y123 grains were formed, while the formation of the subsidiary Y123 grains was suppressed and a nearly single Y123 grain grew when a thick and wide seed was used. The formation of the subsidiary Y123 grains decreased the levitation forces and trapped magnetic field, due to the presence of grain boundaries with weak link characteristics
Keywords :
barium compounds; crystal growth from melt; grain boundaries; high-temperature superconductors; magnetic fields; magnetic levitation; yttrium compounds; HTSC; YBa2Cu3O7-y; YBa2Cu3O7; fabrication; good-quality single grain YBaCuO sample; grain boundaries; growth mode; levitation forces; seed crystals control; slab-like Sm-seed; subsidiary Y123 grains; top-seeded melt processed YBCO samples; trapped magnetic field; weak link characteristics; Conducting materials; Crystalline materials; Fabrication; Grain size; Laboratories; Levitation; Magnetic fields; Powders; Temperature; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
