  The layered RuBr3-RuI3 honeycomb system was synthesized at high-pressures.
The crystal structures are centrosymmetric (space group R-3), and based on
honeycomb layers of Ru$^{3+}$ (S=1/2). Their basic physical properties are
surveyed. The solid solution switches from insulating to metallic in the range
of concentrations between RuBr$_{0.75}$I$_{2.25}$ and RuBr$_{0.50}$I$_{2.50}$.
A preliminary structure/property phase diagram is presented. Our results
suggest that this solid solution may provide insight into the influence of
disorder on spin-orbit-coupled quantum spin liquids.
