1. State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 P. R. China
2. Key Laboratory of Automobile MaterialsMinistry of EducationDepartment of Materials Science and Engineering, Jilin University Changchun 130022 P. R. China
3. Materials Science and EngineeringPhysical Science and Engineering DivisionKing Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia