[1] Inner Mongolia Univ Sci & Technol, Key Lab Integrated Exploitat Baiyun Obo Multimet, Baotou 014010, Peoples R China
[2] Anyang Normal Univ, Sch Phys & Elect Engn, Anyang 455000, Peoples R China
[3] Cent Iron & Steel Res Inst, Dept Funct Mat Res, 76 Xueyuannan Rd, Beijing 100081, Peoples R China
[4] Weishan Cisri Rare Earth Mat Co Ltd, Jining 277600, Peoples R China