Structural stability and Raman scatterin g of CoPt and NiPt hollow nanospheres under high pressure

This paper reports that the high pressure in situ angled ispersive x -ray diffraction and Raman scattering studies on CoPt and NiPt hollown anospheres are performed by means of a diamond anvil cell for generating external pressure at room temperature. The crystal structures of both the CoPt and NiP hollow nanospheres keeps table up to about 41GPa. More over, it shows that the hollow nanospheres possess higher bulk moduli than their bulk counterparts by using thefirst-principl esdensity functional theory.