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The crystal structure of SrCo 0.7 Fe 0.2 Nb 0.1 O 2.72  was determined using a combination of precession electron diffraction (PED), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and spatially resolved electron energy loss spectroscopy (STEM-EELS). The structure has a tetragonal  P 4/ mmm  symmetry with cell parameters  a  =  b  =  a p  ,  c  = 2 a p   ( a p   being the cell parameter of the perovskite parent structure). Octahedral BO 2  layers alternate with the anion-deficient BO 1.4  layers, the different B cations are randomly distributed over both layers. The specific feature of the SrCo 0.7 Fe 0.2 Nb 0.1 O 2.72  microstructure is a presence of extensive nanoscale twinning resulting in domains with alignment of the tetragonal  c -axis along all three cubic direction of the perovskite subcell.

Layered oxygen vacancy ordering in Nb-doped SrCo 1-x Fe x O 3-δ perovskite