Structural Classification of Perovskites ‚ Hierarchy

The relations of the different phases in this section become claer, when we refer to the general formula

m ( A_1-x B_y B'_z X₃ )

Particularly:

m x y z Formula Section

1 var. 1 0 A_1‚x B X₃ 2.1

2 1 1/2 1/2 B B' X₆ 2.2

2 0 1 0 A₂ B X₆ 2.3

var. var. var. var. (general) 2.4

Adapted from "Hierarchies of perovskite-like crystals" by K. S. Aleksandrow and V. V. Beznosikov in Physics of the Solid State 39, 695-715 (1997).