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HOME > J Korean Powder Metall Inst > Volume 15(1); 2008 > Article
저 순도 BaCO3 분말을 사용한 Yba2Cu3O7-y 초전도체의 합성
김찬중, 박순동, 최정숙, 전병혁, 문종백, 이상헌, 성태현
Synthesis of Yba2Cu3O7-y Superconductor using a Low Purity BaCO3 Powder
Chan-Joong Kim, Soon-Dong Park, Jung-Suk Choi, Byung-Hyuk Jun, Jong-Baik Moon, Sang-Heon Lee, Tae-Hyun Sung
Journal of Korean Powder Metallurgy Institute 2008;15(1):6-12
DOI: https://doi.org/10.4150/KPMI.2008.15.1.006
1한국원자력연구원 나노소재응용랩
2한국원자력연구원 나노소재응용랩
3한국원자력연구원 나노소재응용랩
4한국원자력연구원 나노소재응용랩
5선문대학교 전자공학부
6선문대학교 전자공학부
7한국전력연구원 초전도응용그룹
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[ YBa_2Cu_3O_7-y ](123) powders were synthesized by the solid state reaction method using two different purity BaCO_3 powders (99.75% and 99.7% purity) and Y_2O_3 (99.9%) and CuO (99.9%) powders. The effect of BaCO_3 purity on the formation of a 123 phase and the superconducting properties were investigated. The mixtures of raw powders were calcined at temperature ranges of 800°C-880°C in air and finally made into a single grain samples by a melt processing with top seeding. It was found that a 123 phase was well formed at temperature above 870°C, but the purity effect on the 123 formation was negligible. The single-grain 123 samples prepared from the different BaCO_3 powders showed the same T_c value of 90.5 K and similar J_c values about 104;A/cm2 at 0 T and 77 K, and 103;A/cm2 at 2 T and 77 K. This result indicates that the low purity, cheap price BaCO_3 powder can be used as a raw material for the fabrication of single-grain, high-J_c superconducting levitator.

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