Progress in Superconductivity
- 제9권1호
- /
- Pages.115-118
- /
- 2007
- /
- 1229-4764(pISSN)
The Effect of Seed on Top-seeded Melt-growth (TSMG) Processing of a RE-123 Superconductor
-
O, Yong-Taeg
(Department of Advanced Materials Engineering, Chosun University) ;
-
Sung, Tae-Hyun
(Superconductivity & Applications Group at Korea Electric Power Research Institute (KEPRI)) ;
- Jeong, Nyeon-Ho (Superconductivity & Applications Group at Korea Electric Power Research Institute (KEPRI)) ;
-
Kim, Chan-Joong
(Nuclear nanomaterials development laboratory Korea Atomic Energy Research institute (KAERI)) ;
-
Shin, Dong-Chan
(Department of Advanced Materials Engineering, Chosun University)
- 발행 : 2007.10.31
초록
This study investigated the effects of different kinds of seed crystals with miscut angles and pretreatment on the characteristics of a RE-123 superconductor processed by a top-seeded melt-growth (TSMG) method. When the seed crystal was heat-treated in an oxygen atmosphere, the surface structure was cleaned removing hydroxide. When the seed crystal had a miscut angle, in addition, the surface structure showed a well defined hill-and-valley structure after heat-treatment. A better microstructure, with a well-distributed small RE-123 phase, was obtained using a high miscut angle after heat-treatment in an oxygen atmosphere. As a result of the microstructure improvement, the magnetic characteristics also improved. The experimental result can be explained by reduction of nucleation activation energy.