1. School of Materials Science and Engineering, Harbin University of Science and Technology, 52 Xuefu Road, Harbin, Heilongjiang 150080, P. R. China
2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, 52 Xuefu Road, Harbin, Heilongjiang 150080, P. R. China
3. School of Electrical and Electronic Engineering, Harbin University of Science and Technology, 52 Xuefu Road, Harbin, Heilongjiang 150080, P. R. China
4. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, 4 Second Section on Jianshe North Road, Chengdu, Sichuan 610054, P. R. China