1. School of Rare Earth Research and Development, Inner Mongolia University of Science and Technology, Baotou 014010
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819
3. Baotou Materials Research Institute of Shanghai Jiao Tong University, Baotou 014010
4. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010
5. Institute of Energy Power Innovation, North China Electric Power University, Beijing 102206