High-resolution TEM scans were obtained using an FEI Talos 200X Scanning/Transmission microscope (S/TEM) with EDS. the data is in "tif" format HR-TEM images of the structure of BaCo0.7Yb0.2Bi0.1O3-x. Analytical-grade powders BaCO3, Co3O4, Yb2O3 and Bi2O3, (commercially available) were initially mixed with a mortar and pestle; according to the molar ratios of Ba:Co:Yb:Bi = 1:0.7:0.2:0.1. The obtained mixtures were heated first at 950 then at 1,100oC for 12 h. grounded with a mortar and pestle before TEM