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57Fe‐Mössbauer spectra at various pressures before and after heat treatment of iron–nitrogen mixtures. Black: Initial 57Fe in N2 pressure medium at 5.3 GPa prior to laser heating. Red: After laser heating at 5.3 GPa the spectrum indicates formation of ζ‐57Fe2N/ϵ‐57Fe3N1+x 30 Green: Multiplet of the new phase after laser heating. Blue: Spectrum indicating the reformation of ζ‐57Fe2N/ϵ‐57Fe3N1+x after laser heating at pressures below 10 GPa.
