Ternary Inorganic Compounds Containing Carbon, Nitrogen, and Oxygen at High Pressures

Ternary C_<i>x</i>N_<i>y</i>O_<i>z</i> compounds are actively researched as novel high energy density and ultrahard materials. Although some synthesis work has been performed at ambient conditions, very little is known about the high pressure chemistry of of C_<i>x</i>N_<i>y</i>O_<i>z</i> compounds. In this work, first-principles variable-composition evolutionary structure prediction calculations are performed with the goal of discovering novel mixed C_<i>x</i>N_<i>y</i>O_<i>z</i> materials at ambient and high pressure conditions. By systematically searching ternary variable composition crystalline materials, the full ternary phase diagram is constructed in the range of pressures from 0 to 100 GPa. The search finds the C₂N₂O crystal containing an extended covalent network of C, N, and O atoms, having space group symmetry <i>Cmc</i>2₁, and stable above just 10 GPa. Several other novel metastable (CO)_<i>x</i>–(N)_<i>y</i> crystalline compounds discovered during the search, including two polymorphs of C₂NO₂ and two polymorphs of C₃N₂O₃ crystals, are found to be energetically favorable compared to polymeric carbon monoxide (CO) and nitrogen. Predicted new compounds are characterized by their Raman spectra and equations of state