1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences (Beijing) Beijing 100083 P. R. China
2. International Center for Quantum Materials and Electron Microscopy LaboratorySchool of PhysicsPeking University Beijing 100871 P. R. China
3. State Key Laboratory of Marine Resource Utilization in South China SeaSchool of Materials Science and EngineeringHainan University Haikou 570228 P. R. China
4. State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua University Beijing 100084 China