Fig. 3: Thermodynamical properties of gold/silver atoms diffusion from pyrite bulk to the surface.
From: Hyperenrichment of gold in pyrite induced by solid-state transportation
a Schematic of single gold atom substitution on Fe sites in each of the n layers of the pyrite {100} surface. The relative small yellow and large brown spheres denote sulfur and iron atoms, respectively. b Formation enthalpy (∆Hf) of gold and silver substitution on Fe sites as a function of substitution depth for pyrite {100} surface.
