1. School of Material Sciences and Engineering
2. Hebei University of Technology
3. Tianjin 300130
4. PR China
5. Institute for Superconducting &Electronic Materials
6. University of Wollongong
7. Wollongong 2500
8. Australia
9. Department of Physics
10. Tianjin University
11. Tianjin 300350
12. School of Science
13. Hubei University of Automotive Technology
14. Shiyan