Fig. 3: Phase transformations of BM-SFO → SrFeO2.75 → P-SFO observed on BM-SFO/LSAT with starting OVCs perpendicular to LSAT(001).
From: Guided anisotropic oxygen transport in vacancy ordered oxides
a–d Time-stamped in-situ TEM images taken from Supplementary Movie 3 illustrating a two-step phase transition process. The yellow and white dashed lines indicate the two reaction fronts. e–g High-resolution TEM images matching the highlighted regions shown in (b) and (d) and j–l, their corresponding structure models. h HAADF-STEM image of an SFO/LSAT sample showing the coexistence of three different phases. i In-plane lattice spacing (between Sr-Sr ions) map of the blue box marked region shown in (h). m Comparison of experimentally measured values (symbols) with DFT calculated results (dashed lines) for in-plane Sr-Sr interatomic distances among the three phases. The error bars of ≈0.1 Å is determined considering the finite pixel size of the experimental HAADF image.
