Fig. 3: Defect mediated catalyst characterization.
From: Mechanochemical ammonia synthesis enhanced by silicon nitride as a defect-inducing physical promoter
a XRD patterns of N2 adsorbed Si3N4/FeN* and regenerated Si3N4/Fe in comparison with pristine Fe. b High-resolution XPS N 1 s spectrum of Si3N4/FeN* and re-Si3N4/Fe powders. c Mössbauer spectra of Si3N4/FeN* at room temperature. d ESR and e Raman spectra of pristine Fe and nitrogenated Fe (FeN*) powders. f EXAFS spectra of pristine Fe, commercial FexN (x = 2–4), re-Si3N4/Fe, and Si3N4/FeN*. g Corresponding wavelet transform analyses.
