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Nitrogen and oxygen are also among the most abundant elements in the universe. We explore the N-O system at 0\u2009K and up to 500\u2009GPa though ab initio evolutionary simulations. Results show that two phase transformations of stable molecular NO<jats:sub>2<\/jats:sub> occur at 7 and 64\u2009GPa and followed by decomposition of NO<jats:sub>2<\/jats:sub> at 91\u2009GPa. All of the NO<jats:sup>+<\/jats:sup>NO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup> structures are found to be metastable at T\u2009=\u20090\u2009K, so experimentally reported ionic NO<jats:sup>+<\/jats:sup>NO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup> is either metastable or stabilized by temperature. N<jats:sub>2<\/jats:sub>O<jats:sub>5<\/jats:sub> becomes stable at 9 GPa and transforms from <jats:italic>P<\/jats:italic>-1 to <jats:italic>C<\/jats:italic>2\/<jats:italic>c<\/jats:italic> structure at 51\u2009GPa. NO becomes thermodynamically stable at 198\u2009GPa. This polymeric phase is superconducting (<jats:italic>T<\/jats:italic><jats:sub><jats:italic>c<\/jats:italic><\/jats:sub>\u2009=\u20092.0\u2009K) and contains a -N-N- backbone.<\/jats:p>","DOI":"10.1038\/srep16311","type":"journal-article","created":{"date-parts":[[2015,11,17]],"date-time":"2015-11-17T16:49:44Z","timestamp":1447778984000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Nitrogen oxides under pressure: stability, ionization, polymerization and superconductivity"],"prefix":"10.1038","volume":"5","author":[{"given":"Dongxu","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Artem R.","family":"Oganov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao","family":"Dong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang-Feng","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiang","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangrui","family":"Qian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huafeng","family":"Dong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2015,11,17]]},"reference":[{"key":"BFsrep16311_CR1","doi-asserted-by":"publisher","first-page":"14419","DOI":"10.1103\/PhysRevB.46.14419","volume":"46","author":"C Mailhiot","year":"1992","unstructured":"Mailhiot, C., Yang, L. 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