1. State Key Laboratory of Organic–Inorganic CompositesBeijing Key Laboratory of Energy Environmental CatalysisBeijing University of Chemical Technology Beijing 100029 P. R. China
2. GRINM Group Corporation Limited Beijing 100088 P. R. China
3. Grirem Advanced Materials Co., Ltd. Beijing 100088 P. R. China
4. Hebei Province Rare Earth Functional Materials Manufacturing, Innovation Center Xiongan 071700 P. R. China