Crystal Structure of the New Ordered Phases Based on Y₂Ba₃Fe₃Co₂O_{13 + δ}

New phases with an ordered structure of the composition Y₂Ba₃Fe_{5– y}Co_yO_{13 + δ} (1.7 ≤ y ≤ 2.1) were obtained via the glycerol-nitrate technique. The regions of existence of two types of structures were determined by transmission electron microscopy: for 1.7 ≤ y ≤ 1.8, the structure described as a_p × a_p × 3a_p, and for 1.9 ≤ y ≤ 2.1, it is a_p × a_p × 5a_p, where a_p is the parameter of the ideal cubic perovskite. The unit cell parameters for all single-phase samples were refined by the Le Bail method. The phase composition of oxides outside the homogeneity ranges is determined.