|
|
|
A Study on the Components of MgB2 Thick Film Prepared via HPCVD |
| JIA Zhang, GUO Jing-pu, LU Ying, WANG Xin-feng, CHEN Chin-ping, XU Jun, WANG Xiao-nan, ZHU Meng, FENG Qing-rong |
| School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China |
|
|
|
|
Abstract Superconducting MgB2 thick film has been prepared via hybrid physical chemical vapor deposition method on Al2O3 (0001) substrate by using B2H6 and magnesium ingot as raw materials reacted from 730 to 830?C for 40 min under 20 to 30 kPa. Its thickness is about 40 ?m. The MgB2 thick film shows Tc (onset) = 39.0 K and Tc (0) = 37.2 K. X-ray diffraction pattern shows that the film grown along (101) direction has small amount of impurities of Mg and MgO. Scanning electron microscopy and energy dispersive X-ray spectroscopy indicated that these impurities existed indeed and were Mg rich. The MgO film was formed on the surface of the MgB2 thick film to further protect the sample from oxidation. We presented a new mechanism for the formation of the thick film.
|
|
Issue Date: 05 March 2006
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
