1. School of Materials Science and Technology & Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesChina University of Geosciences Beijing 100083 China
2. Electrophysical DivisionBeijing Research Institute of Automation for Machinery Industry Co. Ltd. Beijing 100120 China
3. College of StandardizationChina Jiliang University Hangzhou Zhejiang 310018 China
4. Department of PhysicsNational University of Mongolia Ulaanbaatar 14201 Mongolia
5. Department of PhysicsIncheon National University Incheon 22012 South Korea