Extended Data Fig. 7: 90°-reconfiguration of SrFeO2.5 [100] ahead of advancing phase boundary. | Nature Chemistry

Extended Data Fig. 7: 90°-reconfiguration of SrFeO2.5 [100] ahead of advancing phase boundary.

From: Monitoring the formation of infinite-layer transition metal oxides through in situ atomic-resolution electron microscopy

Extended Data Fig. 7: 90°-reconfiguration of SrFeO2.5 [100] ahead of advancing phase boundary.The alternative text for this image may have been generated using AI.

a, Time sequence HRTEM images showing the phase transformation of SrFeO2.5 [100] to SrFeO2 [110]. White dashed line in each image indicates the phase boundary. b, Magnified images of the phase boundary outlined yellow in a. The structural features inherent to the SrFeO2.5 [010] appeared as a consequence of 90°-reconfiguration, that is, the AFD rotation (β ~±7°) of FeO6 in the octahedral layers and the VO channels (δFe-Fe = 3.9 Å) in the tetrahedral layers. c, Interlayer d-spacing map of the strontium layers, dSr-Sr, for phase identification. Alternating red (tetrahedral layers) and blue (octahedral layers) stripes correspond to SrFeO2.5 while uniform blue region corresponds to SrFeO2 phase. d, Intralayer Fe-Fe distance δFe-Fe map visualizing the normally aligned VO channels. The chequerboard pattern appearing in the SrFeO2.5 [100] ahead of moving phase boundary indicates 90°-reconfiguration which brings the laterally aligned VO channels to the normally aligned one. Uniform green color far below the phase boundary indicates the pristine SrFeO2.5 [100] without reorientation.

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