EXAFS study of metal-coated particles produced by ball milling

摘要

EXAFS measurements have been carried out on mixtures of Sa with Ge and Si, and Pt with SiO(sub 2) which have been ball milled for extended periods. In these systems the brittle component (Ge, Si, or SiO(sub 2)) is ground to nanocrystalline dimensions while the ductile metal is found to coat the outer surface the particles. Analysis shows that in the Sn-Ge and Sn-Si systems, mixing at the interface is found to form apparently cubic SnGe and SnSi alloys respectively. In the Pt-SiO(sub 2) system while no mixing is observed, the Pt is found to be highly dispersed on the surface of SiO(sub 2) particles.