| 학회 | 한국재료학회 |
| 학술대회 | 2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 | 13권 2호 |
| 발표분야 | 전자재료 |
| 제목 | Formation of the Bi-2212 Phase in a BiSrCaO Thick Film Screen-Printed on Cu/Ni/Cu-Substrate |
| 초록 | Metallic Ag has been widely used as a Bi-superconductor substrate on account of its superior oxidation resistance, chemical stability, formability, and electrical conductivity. However, the high cost of Ag has been an obstacle to the commercialization of Bi-superconductors. Although the cheaper metals Cu and Ni, which have high conductivity, have been considered as potential substitutes for Ag, research on Bi-superconductors with a Cu substrate has rarely been reported. In the present study, we therefore examined the use of Cu as a superconductor substrate. Cu has the advantages of low cost and high conductivity, but it has the disadvantages of easy oxidation in high temperature processing. To adopt Cu as a substrate material for Bi-superconductors, Ni and Cu were electroplated on a Cu sheet; in this structure, Ni restrained the oxidation of Cu, and the Cu acted as the source element to provide Cu-oxides. Superconducting phases such as Bi-2212 were obtained by sequential heat treatments in Ar gas and Ar-20vol%O2 gas. In particular, the (00l)-plane of the Bi-2212 phase tended to develop in the exterior region close to the free surface rather than in the interior region. The critical onset temperatures (Tc,onset) of the specimens produced by the sequential heat treatments ranged from 73.4 K to 78.5 K. This study provided a possibility that Cu can be used as a substrate material for Bi-superconductors. |
| 저자 | 이기선1, 박인수2 |
| 소속 | 1공주대, 2성균관대 |
| 키워드 | Superconductor; Bi; Cu sheath; screen printing |
