Fig. 3: Structural characterizations of Fe3O4@χ-Fe5C2 octahedra.
From: Facet sensitivity of iron carbides in Fischer-Tropsch synthesis
a TEM image of Fe3O4@χ-Fe5C2 octahedra. b HAADF-STEM image of an individual Fe3O4@χ-Fe5C2 octahedron. c Magnified HAADF-STEM image of the region marked by the corresponding box in panel (b). d Intensity profile recorded from the area indicated by the rectangular box in panel (c). e Intensity profile recorded from the area indicated by the rectangular box in panel (c). f FFT pattern from box f in panel (c). g Simulated FFT pattern from of Fe3O4 along the [1−10] direction. h FFT pattern from box h in panel (c). g Simulated FFT pattern from of χ-Fe5C2 along the [20−1] direction. j EELS spectra of a Fe3O4@χ-Fe5C2 octahedron in panel (c). k elemental mapping images of a Fe3O4@χ-Fe5C2 octahedron. l Line-scan profile recorded along the line of the inset HAADF image. m Mössbauer spectra of Fe3O4@χ-Fe5C2 octahedra.
