1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
2. University of Science and Technology of China, Hefei 230026, China
3. Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, P. R. China
4. School of Material Science and Engineering, Shandong University, Jingshi Road, Jinan 266071, P. R. China
5. School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong 529020, P. R. China