1. School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, P. R. China
2. College of Physical Science and Technology, Xinjiang University, Urumqi 830017, P. R. China
3. National Energy Metal Resources and New Materials Key Laboratory, Central South University, Changsha 410083, P. R. China