Fig. 4: Transition from Pt3Fe to PtFe IMC.
From: In-situ atomic tracking of intermetallic compound formation during thermal annealing
a–d Time-series AC-HAADF-STEM images. e–h FFT patterns correspond to the orange and blue dashed squares in a–d, respectively. False color is added to guide the vision. i HAADF-STEM image imposed with iFFT image (orange color), generated from the superlattice spots of Pt3Fe {001}. j–l HAADF-STEM images imposed with iFFT image (yellow color), generated from the superlattice spots of PtFe {011}. Inset is the FFT pattern used to generate the iFFT image. m–p Atomic models corresponding a–d to illustrate the orientation relationship and structure evolution. q–t HAADF-STEM images of nanoparticles that are transforming from Pt3Fe to PtFe through Fe diffusion. Scale bar: 2 nm.
