1. State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University; Xi'an 710072 P.R. China
2. Faculty of Science Department of Physical and Macromolecular Chemistry Charles University in Prague; 128 43 Prague 2 Czech Republic
3. Department of Physics, Shenzhen University; Shenzhen Guangdong 518060 P.R. China
4. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University; Xi'an 710049 P.R. China
5. Centre for Science at Extreme Conditions (CSEC) School of Physics and Astronomy University of Edinburgh; Edinburgh EH9 3JZ UK