Fig. 2: Synthesis and characterizations of metastable ɛ-Fe2C. | Nature Communications

Fig. 2: Synthesis and characterizations of metastable ɛ-Fe2C.

From: Potassium-stabilized metastable carbides and chalcogenides via surface chemical potential modulation

Fig. 2: Synthesis and characterizations of metastable ɛ-Fe2C.

a Scheme for the synthesis of ɛ-Fe2C from K-Fe2N (red arrow: K+-modified strategy). Red atoms: Fe, green atoms: C. Visuals of ɛ-Fe2C and χ-Fe5C2 were produced with VESTA50 and Blender. b XRD patterns of Fe5C2@C and K-Fe2C@C. c, d XPS C1s spectra and Fe 2p spectra of Fe5C2@C and K-Fe2C@C. e EXAFS spectra of Fe5C2@C and K-Fe2C@C. f, g Mössbauer spectra of Fe5C2@C and K-Fe2C@C. All “a.u.” represents arbitrary units.

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