1. Guangxi Key Laboratory of Information Materials
2. School of Materials Science and Engineering
3. Guilin University of Electronic Technology
4. Guilin
5. P. R. China
6. Center for Dielectrics and Piezoelectrics
7. Materials Research Institute
8. The Pennsylvania State University
9. University Park
10. USA
11. Department of Applied Physics
12. Hong Kong Polytechnic University
13. Kowloon Hong Kong