1. Institute of Nanostructured Functional Materials; Huanghe Science and Technology College; Zhengzhou Henan 450006 P.R. China
2. Henan Provincial Key Laboratory of Nano-composite materials and Applications; Zhengzhou Henan 450006 P.R. China
3. Center for High Pressure Science and Technology Advanced Research, HPSTAR; Beijing 100094 P.R. China
4. HPSynC, Geophysical Laboratory; Carnegie Institution of Washington, Argonne; IL 60439 USA