Origin on 2 [1 1 0] at 21 1 (1, 2)
Asymmetric unit | 0 ≤ x ≤ 1; 0 ≤ y ≤ 1; 0 ≤ z ≤ 1/8 |
Symmetry operations
(1) 1 | (2) 2(0, 0, 1/2) 0, 0, z | (3) 4+(0, 0, 1/4) 0, 1/2, z | (4) 4-(0, 0, 3/4) 1/2, 0, z |
(5) 2(0, 1/2, 0) 1/4, y, 1/8 | (6) 2(1/2, 0, 0) x, 1/4, 3/8 | (7) 2 x, x, 0 | (8) 2 x, -x, 1/4 |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2); (3); (5)
Positions
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions | |||||||||||
General: | |||||||||||||
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| 00l : l = 4n h00 : h = 2n |
Special: as above, plus | |||||||||
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| 0kl : l = 2n + 1 or 2k + l = 4n |
Symmetry of special projections
Along [001] p4gm a' = a b' = b Origin at 0, 1/2, z | Along [100] p2gg a' = b b' = c Origin at x, 1/4, 3/8 | Along [110] p2gm a' = 1/2(-a + b) b' = c Origin at x, x, 0 |
Maximal non-isomorphic subgroups
I | [2] P4111 (P41, 76) | 1; 2; 3; 4 | |
[2] P2112 (C2221, 20) | 1; 2; 7; 8 | ||
[2] P21211 (P212121, 19) | 1; 2; 5; 6 |
IIa | none |
IIb | none |
Maximal isomorphic subgroups of lowest index
IIc | [3] P43212 (c' = 3c) (96); [5] P41212 (c' = 5c) (92); [9] P41212 (a' = 3a, b' = 3b) (92) |
Minimal non-isomorphic supergroups
I | [3] P4132 (213) |
II | [2] C4122 (P4122, 91); [2] I4122 (98); [2] P42212 (c' = 1/2c) (94) |