Vacancy-mediated alloying in bimetallic Nanoparticles
This image shows a bimetallic Au-core Ag-shell
nanoparticle that has an interface that is "dirty". 5% of
the interfacial atoms are missing from the lattice and
these built-in vacancies greatly increase (by 8 orders
of magnitude) the alloying rates for the two metals. The
vacancy sites are shown as pink "ghost" atoms, and the
diffusion of the vacancies through the metallic lattice
does a great job of mixing the two metals.
Research: Chuck Vardeman, Image rendered by Matthew A. Meineke.