1. National Engineering Research Center for Rare Earth Materials, GRINM Group Co., Ltd., Beijing 100088, China
2. GRIREM Advanced Materials Co., Ltd., Beijing 100088, China
3. General Research Institute for Nonferrous Metals, Beijing 100088, China
4. Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, School of Chemistry, Biology and Materials Science, East China University of Technology, Nanchang 330013, P. R. China