Fig. 3: Gradient distribution of Sn substitution Al in FeSiAl matrix.

a HAADF image of FeSiAl:Sn matrix. b Sn intensity profile along the cyan line scan in a. c Fe, Si/Al atom columns viewed along [110] direction, where the blue circles stand for Al and Si atom columns, and the golden circles stand for Fe atom columns. d-f Atomic-resolution HAADF-STEM images of FeSiAl:Sn matrix corresponding to different positions in a with zone axis of [110]. g-i The enlarged images of the cyan box in d, e, and f, respectively. j-l Normalized atomic-resolution HAADF-STEM images corresponding to d, e, and f, respectively. Light grey circles represent Fe atom columns, while the other color of circles indicates the atomic intensity contrast of different Si/Al atom columns. Source data are provided as a Source Data file.