a
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: hongjie@ciac.jl.cn
;
Fax: +86 431 85698041
;
Tel: +86 431 85262127
b
Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China