1. Key Laboratory
of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, P. R.
China
2. Jilin Institute of Chemical Engineering, Jilin 132022, P.
R. China
3. State Key Laboratory
of Rare Earth Resource Utilization, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences,
Changchun 130023, P. R. China