“…Tw os ingle crystal diffraction patterns from the multianvil reaction product and two from the laser-heated diamond anvil cell reaction product are shown in Figures 4a-d, respectively.T hese are indexed to the cubic rocksalt Fm " 3m structure.A nX RD pattern from asample extracted from apellet, also indexed to the cubic rocksalt Fm " 3m structure with the bulk Mg 0.4 Fe 0.6 N composition, is shown in Figure 5. In contrast to the 15 to 23 GPa experiments,i na na mbient and four lower pressure experiments to 3GPa and 1500 Ko nm agnesium, iron, iron nitride,n itrogen and sodium azide containing mixtures (see also the Supporting Information containing more detailed experimental description) using tube furnace,p iston cylinder [22] (Helmholtz Centre Potsdam) and MAX80 press [23] (DESY,Deutsches Elektronen Synchrotron, Hamburg) devices,o nly iron, iron nitride,m agnesium, magnesium nitride and magnesium oxide result. …”