1. School of Science
2. Key Laboratory of the Ministry of Education and International Center for Dielectric Research
3. Xi'an Jiaotong University
4. Shann xi, China
5. School of Physics and Electronic Science
6. Shanxi Datong University
7. Shanxi 037009, P. R. China
8. School of Materials Science and Engineering
9. TianJin University
10. Tianjin, China