Metastable Fe 1-x Zn x O solid solutions (0 < x ≤ 0.5) synthesized at 7.7 GPa and 1500 K by a solidphase reaction between w-ZnO and rs-FeO have a cubic rock salt structure (Fm-3m) and are kinetically stable up to ~700 K. The dependence of the lattice parameter on the composition for these solid solutions has a nonlinear character, which is not typical for the binary MeO-ZnO solid solutions (Me = Ni, Mn). The synthesized solid solutions do not contain ferro-or ferrimagnetic