Figure 14
Possible maximal symmetries for a distorted structure with parent space group (No. 221) having an I-centred supercell (a – b, a + b, 2c) with respect to the cubic unit cell. The same results are obtained if an F-centred supercell (2a, 2b, 2c) or a primitive supercell (a + c, b + c, 2c) is introduced, as they define the same sublattice for the distorted structure. |