1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, College of Physics, College of Information and Technology, Jilin Normal University, Changchun 130103, China
2. School of Physical Science and Technology, MOE Key Lab of New Processing Technology for Nonferrous Metals and Materials, and Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China