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- Title
Superconducting properties and growth mechanism of layered structure in MgB bulks with Cu/YO co-doping.
- Authors
Cai, Qi; Liu, Yongchang; Ma, Zongqing; Yu, Liming
- Abstract
Bulk MgB samples containing Cu and YO have been prepared by conventional solid state reaction at 850 °C, and the structure and superconducting properties have been investigated. Differing from the structure in previous studies, a type of novel, layered structure was obtained in Cu/YO-doped MgB sample. Furthermore, the critical current density ( J) at high field (>4 T) was improved compared to undoped, and Cu-doped MgB samples. After analyzing the phase composition, microstructure, and sintering process, it was found that YO and Cu are independent in providing effective pinning centers, and YB impurity should be responsible for the enhancement of J as well as the increased irreversible magnetic field. However, J at low field was slightly worsened, but still maintaining 10 A cm at 0 T, since the intercrystalline connectivity was not seriously deteriorated. Finally, a possible growth model was put forward to describe the formation sequences of the layered structure. It was supposed that the formation of steps at low temperature originated from the coherent relationship between Mg and MgB, while the steps formed at high temperature were related to the pinning effect of secondary phase during the migration of grain boundary.
- Subjects
SUPERCONDUCTIVITY; MICROSTRUCTURE; SINTERING; MAGNETIC fields; LOW temperatures; CRYSTAL grain boundaries
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 5, p1451
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-012-0951-y