1. College of Science, Chongqing University of Technology, Chongqing 400054, China
2. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
3. Department of Physics, Georgia Southern University, Statesboro, Georgia 30460, United States
4. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China