1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China
2. Beijing Computational Science Research Center, Beijing 100084, PR China
3. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, PR China
4. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China
5. School of Physics, Beihang University, Beijing 100191, PR China