Extended Data Figure 4 : Structural and compositional analysis of the three phases.

From: Electric-field control of tri-state phase transformation with a selective dual-ion switch

Extended Data Figure 4

a, HAADF-STEM results with the calculated lattice structures (shown in the insets) of SrCoO2.5 and SrCoO3−δ. The zone axis is along the [110] direction of the LSAT substrate. b, Statistical analysis of the in-plane strontium–strontium interatomic distances for the three phases, and their comparison with theoretical calculations. c, Chemical expansion during phase transformations. d, Energy-dispersive X-ray spectroscopy results for as-grown SrCoO2.5 (green) as well as ILG-induced SrCoO3−δ (red) and HSrCoO2.5 (blue), grown on LSAT(001) substrate. Error bars represent the standard deviation of the measurements.