1. College of Physics and Electronic Information, Anhui Key Laboratory of Energetic Materials, Huaibei Normal University, 100 Dongshan Road, Huaibei, 235000, P. R. China
2. Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, 350 Shushan Lake Road, Hefei, 230031, China
3. Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, China