1. College of Physics and Engineering, Chengdu Normal University, Chengdu 611130, China
2. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
3. School of Materials Science and Engineering, Hainan University, Haikou 570228, China
4. College of Mechanical and Electrical, Mianyang Teachers’ College, Mianyang 621000, China