1. School of Materials Science and Engineering; Key Laboratory of Nonferrous Material and New Processing Technology of Ministry of Education; Guilin University of Technology; Guilin 541004 China
2. Guilin University of Technology; Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi; Guilin 541004 China
3. Center for Nanoscale Characterization & Devices (CNCD); Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics; Huazhong University of Science and Technology (HUST); Wuhan 430074 P.R. China