Electron microscopy
Pm-3m (221) Space Group
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Table 3010a. Pm-3m (221) space group.

Name in the International Tables for Crystallography
Pm-3m P
221 m-3m
Crystal system
Cubic m-3m
0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1/2 and 0 ≤ z ≤ 1/2 and y ≤ x and z ≤ y
Symmetry (atomic coordinates)
X, Y, Z; -X, -Y, Z; -X, Y, -Z; X, -Y, -Z; Z, X, Y; Z, -X, -Y; -Z, -X, Y; -Z, X, -Y; Y, Z, X; -Y, Z, -X; Y, -Z, -X; -Y, -Z, X; Y, X, -Z; -Y, -X, -Z; Y, -X, Z; -Y, X, Z; X, Z, -Y; -X, Z, Y; -X, -Z, -Y; X, -Z, Y; Z, Y, -X; Z, -Y, X; -Z, Y, X; -Z, -Y, -X; -X, -Y, -Z; X, Y, -Z; X, -Y, Z; -X, Y, Z; -Z, -X, -Y; -Z, X, Y; Z, X, -Y; Z, -X, Y; -Y, -Z, -X; Y, -Z, X; -Y, Z, X; Y, Z, -X; -Y, -X, Z; Y, X, Z; -Y, X, -Z; Y, -X, -Z; -X, -Z, Y; X, -Z, -Y; X, Z, Y; -X, Z, -Y; -Z, -Y, X; -Z, Y, -X; Z, -Y, -X; Z, Y, X
Crystal examples

CsI, CsBr.
CsCl: Cs at 0, 0, 0 and Cl at 1/2, 1/2, 1/2.
ReO3 (Rhenium oxide): Re at 0, 0, 0 and O at 1/2, 0, 0.
CaTiO3: Ti at 0, 0, 0; Ca at 1/2, 1/2, 1/2 and O at 1/2, 0, 0.
AuCu3: Au at 0, 0, 0 and Cu at 0, 1/2, 1/2.

Table 3010b. Example of compounds with similar structures to BCC.

TiO2 (Rutile)
Cu2O (Cuprite)
Space group Im-3m P42/mnm Pm-3m Pn-3m
Compounds α-Fe, W, Nb, Ta, Na, K, Mo, V GeO2, SnO2, PbO2 CsI, CsBr, CsCl Pb2O, Ag2O




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