1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, P. R. China
2. University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, P. R. China
3. Shanghai Applied Radiation Institute, State Key Lab. Advanced Special Steel, Shanghai University, No. 99 Shangda Road, Baoshan District, Shanghai 200444, P. R. China