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Li<jats:sub>5<\/jats:sub>P<jats:sub>2<\/jats:sub>N<jats:sub>5<\/jats:sub> is the first lithium nitridophosphate with a layered structure and is made up of corner sharing PN<jats:sub>4<\/jats:sub> tetrahedra forming a corrugated honeycomb\u2010type layer of linked <jats:italic>sechser<\/jats:italic>\u2010rings in chair conformation. The arrangement of the P atoms is analogous to that of black phosphorus. The structure was elucidated from single\u2010crystal X\u2010ray data. To confirm the structure Rietveld refinement, <jats:sup>6<\/jats:sup>Li, <jats:sup>7<\/jats:sup>Li and <jats:sup>31<\/jats:sup>P solid\u2010state NMR spectroscopy were conducted. To corroborate Li<jats:sub>5<\/jats:sub>P<jats:sub>2<\/jats:sub>N<jats:sub>5<\/jats:sub> as the corresponding high\u2010pressure polymorph of \u03b2\u2010Li<jats:sub>10<\/jats:sub>P<jats:sub>4<\/jats:sub>N<jats:sub>10<\/jats:sub> DFT calculations and temperature dependent X\u2010ray powder diffraction were carried out. DFT calculations estimated the transition pressure to 6.5\u2005GPa (without accounting for temperature), which is in line with the synthesis pressure.<\/jats:p>","DOI":"10.1002\/chem.201704975","type":"journal-article","created":{"date-parts":[[2017,11,14]],"date-time":"2017-11-14T09:52:41Z","timestamp":1510653161000},"page":"736-742","source":"Crossref","is-referenced-by-count":18,"title":["Reversible Polymerization of Adamantane\u2010type [P<sub>4<\/sub>N<sub>10<\/sub>]<sup>10\u2212<\/sup> Anions to Honeycomb\u2010type [P<sub>2<\/sub>N<sub>5<\/sub>]<sup>5\u2212<\/sup> Layers under High\u2010Pressure"],"prefix":"10.1002","volume":"24","author":[{"given":"Eva\u2010Maria","family":"Bertschler","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Munich (LMU)  Butenandtstr. 5\u201313 81377 M\u00fcnchen 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