1. State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China
2. Beijing Center for Crystal Research and Development Key Lab of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
3. State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China
4. Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 P. R. China
5. CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P. R. China