1. Institute of Applied Physics and Materials Engineering
2. University of Macau
3. China
4. School of Science
5. Hubei University of Automotive Technology
6. Department of Physics and Chemistry
7. Faculty of Science and Technology
8. Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices
9. Faculty of Physics and Electronic Science
10. Hubei University
11. Wuhan 430062
12. People's Republic of China
13. Department of Physics
14. National University of Singapore
15. Singapore 117542