Origin at -4m 2
Asymmetric unit | 0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; 0 ≤ z ≤ 1/2 |
(1) 1 | (2) 2 0, 0, z | (3) -4+ 0, 0, z; 0, 0, 0 | (4) -4- 0, 0, z; 0, 0, 0 |
(5) m x, 0, z | (6) m 0, y, z | (7) 2 x, x, 0 | (8) 2 x, -x, 0 |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2); (3); (5)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
| | General:
|
| (1) x, y, z | (2) -x, -y, z | (3) y, -x, -z | (4) -y, x, -z | (5) x, -y, z | (6) -x, y, z | (7) y, x, -z | (8) -y, -x, -z |
| no conditions |
| | Special: as above, plus
|
| x, 1/2, z | -x, 1/2, z | 1/2, -x, -z | 1/2, x, -z |
| no extra conditions |
| x, 0, z | -x, 0, z | 0, -x, -z | 0, x, -z |
| no extra conditions |
| x, x, 1/2 | -x, -x, 1/2 | x, -x, 1/2 | -x, x, 1/2 |
| no extra conditions |
| x, x, 0 | -x, -x, 0 | x, -x, 0 | -x, x, 0 |
| no extra conditions |
| | hk0 : h + k = 2n
|
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
Symmetry of special projections
Along [001] p4mm a' = a b' = b Origin at 0, 0, z | Along [100] p1m1 a' = b b' = c Origin at x, 0, 0 | Along [110] p2mm a' = 1/2(-a + b) b' = c Origin at x, x, 0 |
Maximal non-isomorphic subgroups
I | | [2] P-411 (P-4, 81) | 1; 2; 3; 4 |
| | [2] P2m1 (Pmm2, 25) | 1; 2; 5; 6 |
| | [2] P212 (C222, 21) | 1; 2; 7; 8 |
IIb | [2] P-4c2 (c' = 2c) (116); [2] C-4m21 (a' = 2a, b' = 2b) (P-421m, 113); [2] C-4m2 (a' = 2a, b' = 2b) (P-42m, 111); [2] F-4m2 (a' = 2a, b' = 2b, c' = 2c) (I-42m, 121) |
Maximal isomorphic subgroups of lowest index
IIc | [2] P-4m2 (c' = 2c) (115); [9] P-4m2 (a' = 3a, b' = 3b) (115) |
Minimal non-isomorphic supergroups
I | [2] P4/mmm (123); [2] P4/nmm (129); [2] P42/mmc (131); [2] P42/nmc (137) |
II | [2] C-4m2 (P-42m, 111); [2] I-4m2 (119) |