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. 2021 Nov 24;12:6814. doi: 10.1038/s41467-021-26739-1

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© The Author(s) 2021, corrected publication 2022

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Fig. 3 — a, b, d, e Transmission electron microscopy (TEM) analysis. a High-resolution (HR) TEM image and the corresponding fast-Fourier transformed (FFT) pattern of Pr_0.5Ba_0.2Sr_0.3FeO_3−δ (A-PBSF30) with zone axis (Z.A.) = [100] and b high-angle annular dark-field (HAADF) scanning TEM (STEM) image of A-PBSF30 with simple perovskite structure of [100] direction with d-spacing 001. d HR TEM image and the corresponding FFT pattern of (Pr_0.5Ba_0.2Sr_0.3)₂FeO_4+δ – Fe metal (R-PBSF30) with Z.A. = [100] and e HAADF STEM image and the atomic arrangement of R-PBSF30 of [100] direction with d-spacing 001. c, f Scanning electron microscope (SEM) images. SEM images presenting the surface morphologies of c A-PBSF30 sintered at 1200 °C for 4 h in air atmosphere and f R-PBSF30 reduced at 850 °C for 4 h in humidified H₂ environment (3% H₂O). g–i Scanning TEM-energy dispersive spectroscopy (EDS) analysis. g HAADF image of R-PBSF30 and elemental mapping of Pr, Ba, Sr, Fe, and O, respectively. h, i EDS spectra of h the exsolved Fe metal particle (Spectrum 1, red) and i the parent material (Pr_0.5Ba_0.2Sr_0.3)₂FeO_4+δ (Spectrum 2, black).