Origin at 2 3
Asymmetric unit | 0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; -1/4 ≤ z ≤ 1/4; y ≤ x; max(x - 1/2, -y) ≤ z ≤ min(1/2 - x, y) |
Vertices | 0, 0, 0 | 1/2, 0, 0 | 1/2, 1/2, 0 | 1/4, 1/4, 1/4 | 1/4, 1/4, -1/4 |
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For (0, 0, 0)+ set
(1) 1 | (2) 2 0, 0, z | (3) 2 0, y, 0 | (4) 2 x, 0, 0 |
(5) 3+ x, x, x | (6) 3+ -x, x, -x | (7) 3+ x, -x, -x | (8) 3+ -x, -x, x |
(9) 3- x, x, x | (10) 3- x, -x, -x | (11) 3- -x, -x, x | (12) 3- -x, x, -x |
For (0, 1/2, 1/2)+ set
(1) t(0, 1/2, 1/2) | (2) 2(0, 0, 1/2) 0, 1/4, z | (3) 2(0, 1/2, 0) 0, y, 1/4 | (4) 2 x, 1/4, 1/4 |
(5) 3+(1/3, 1/3, 1/3) x - 1/3, x - 1/6, x | (6) 3+ -x, x + 1/2, -x | (7) 3+(-1/3, 1/3, 1/3) x + 1/3, -x - 1/6, -x | (8) 3+ -x, -x + 1/2, x |
(9) 3-(1/3, 1/3, 1/3) x - 1/6, x + 1/6, x | (10) 3-(-1/3, 1/3, 1/3) x + 1/6, -x + 1/6, -x | (11) 3- -x + 1/2, -x + 1/2, x | (12) 3- -x - 1/2, x + 1/2, -x |
For (1/2, 0, 1/2)+ set
(1) t(1/2, 0, 1/2) | (2) 2(0, 0, 1/2) 1/4, 0, z | (3) 2 1/4, y, 1/4 | (4) 2(1/2, 0, 0) x, 0, 1/4 |
(5) 3+(1/3, 1/3, 1/3) x + 1/6, x - 1/6, x | (6) 3+(1/3, -1/3, 1/3) -x + 1/6, x + 1/6, -x | (7) 3+ x + 1/2, -x - 1/2, -x | (8) 3+ -x + 1/2, -x + 1/2, x |
(9) 3-(1/3, 1/3, 1/3) x - 1/6, x - 1/3, x | (10) 3- x + 1/2, -x, -x | (11) 3- -x + 1/2, -x, x | (12) 3-(1/3, -1/3, 1/3) -x - 1/6, x + 1/3, -x |
For (1/2, 1/2, 0)+ set
(1) t(1/2, 1/2, 0) | (2) 2 1/4, 1/4, z | (3) 2(0, 1/2, 0) 1/4, y, 0 | (4) 2(1/2, 0, 0) x, 1/4, 0 |
(5) 3+(1/3, 1/3, 1/3) x + 1/6, x + 1/3, x | (6) 3+ -x + 1/2, x, -x | (7) 3+ x + 1/2, -x, -x | (8) 3+(1/3, 1/3, -1/3) -x + 1/6, -x + 1/3, x |
(9) 3-(1/3, 1/3, 1/3) x + 1/3, x + 1/6, x | (10) 3- x, -x + 1/2, -x | (11) 3-(1/3, 1/3, -1/3) -x + 1/3, -x + 1/6, x | (12) 3- -x, x + 1/2, -x |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); t(0, 1/2, 1/2); t(1/2, 0, 1/2); (2); (3); (5)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
| (0, 0, 0)+ (0, 1/2, 1/2)+ (1/2, 0, 1/2)+ (1/2, 1/2, 0)+ | h, k, l cyclically permutable General:
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| (1) x, y, z | (2) -x, -y, z | (3) -x, y, -z | (4) x, -y, -z | (5) z, x, y | (6) z, -x, -y | (7) -z, -x, y | (8) -z, x, -y | (9) y, z, x | (10) -y, z, -x | (11) y, -z, -x | (12) -y, -z, x |
| hkl : h + k, h + l, k + l = 2n 0kl : k, l = 2n hhl : h + l = 2n h00 : h = 2n
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| | Special: as above, plus
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| x, 1/4, 1/4 | -x, 3/4, 1/4 | 1/4, x, 1/4 | 1/4, -x, 3/4 | 1/4, 1/4, x | 3/4, 1/4, -x |
| no extra conditions |
| x, 0, 0 | -x, 0, 0 | 0, x, 0 | 0, -x, 0 | 0, 0, x | 0, 0, -x |
| no extra conditions |
| x, x, x | -x, -x, x | -x, x, -x | x, -x, -x |
| no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
Symmetry of special projections
Along [001] p2mm a' = 1/2a b' = 1/2b Origin at 0, 0, z | Along [111] p3 a' = 1/6(2a - b - c) b' = 1/6(-a + 2b - c) Origin at x, x, x | Along [110] c1m1 a' = 1/2(-a + b) b' = c Origin at x, x, 0 |
Maximal non-isomorphic subgroups
I | | [3] F21 (F222, 22) | (1; 2; 3; 4)+ |
| | [4] F13 (R3, 146) | (1; 5; 9)+ | | [4] F13 (R3, 146) | (1; 6; 12)+ | | [4] F13 (R3, 146) | (1; 7; 10)+ | | [4] F13 (R3, 146) | (1; 8; 11)+ |
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IIa | | [4] P213 (198) | 1; 5; 9; (2; 7; 12) + (0, 1/2, 1/2); (4; 6; 11) + (1/2, 0, 1/2); (3; 8; 10) + (1/2, 1/2, 0) | | [4] P213 (198) | 1; 7; 10; (2; 5; 11) + (0, 1/2, 1/2); (4; 8; 12) + (1/2, 0, 1/2); (3; 6; 9) + (1/2, 1/2, 0) | | [4] P213 (198) | 1; 8; 11; (2; 6; 10) + (0, 1/2, 1/2); (4; 7; 9) + (1/2, 0, 1/2); (3; 5; 12) + (1/2, 1/2, 0) | | [4] P213 (198) | 1; 6; 12; (2; 8; 9) + (0, 1/2, 1/2); (4; 5; 10) + (1/2, 0, 1/2); (3; 7; 11) + (1/2, 1/2, 0) |
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| | [4] P213 (198) | 1; 5; 9; (3; 8; 10) + (0, 1/2, 1/2); (2; 7; 12) + (1/2, 0, 1/2); (4; 6; 11) + (1/2, 1/2, 0) | | [4] P213 (198) | 1; 7; 10; (3; 6; 9) + (0, 1/2, 1/2); (2; 5; 11) + (1/2, 0, 1/2); (4; 8; 12) + (1/2, 1/2, 0) | | [4] P213 (198) | 1; 8; 11; (3; 5; 12) + (0, 1/2, 1/2); (2; 6; 10) + (1/2, 0, 1/2); (4; 7; 9) + (1/2, 1/2, 0) | | [4] P213 (198) | 1; 6; 12; (3; 7; 11) + (0, 1/2, 1/2); (2; 8; 9) + (1/2, 0, 1/2); (4; 5; 10) + (1/2, 1/2, 0) |
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| | [4] P23 (195) | 1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12 | | [4] P23 (195) | 1; 2; 3; 4; (5; 6; 7; 8) + (0, 1/2, 1/2); (9; 10; 11; 12) + (1/2, 1/2, 0) | | [4] P23 (195) | 1; 2; 3; 4; (5; 6; 7; 8) + (1/2, 0, 1/2); (9; 10; 11; 12) + (0, 1/2, 1/2) | | [4] P23 (195) | 1; 2; 3; 4; (5; 6; 7; 8) + (1/2, 1/2, 0); (9; 10; 11; 12) + (1/2, 0, 1/2) |
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| | [4] P23 (195) | 1; 5; 9; (4; 6; 11) + (0, 1/2, 1/2); (3; 8; 10) + (1/2, 0, 1/2); (2; 7; 12) + (1/2, 1/2, 0) | | [4] P23 (195) | 1; 7; 10; (4; 8; 12) + (0, 1/2, 1/2); (3; 6; 9) + (1/2, 0, 1/2); (2; 5; 11) + (1/2, 1/2, 0) | | [4] P23 (195) | 1; 8; 11; (4; 7; 9) + (0, 1/2, 1/2); (3; 5; 12) + (1/2, 0, 1/2); (2; 6; 10) + (1/2, 1/2, 0) | | [4] P23 (195) | 1; 6; 12; (4; 5; 10) + (0, 1/2, 1/2); (3; 7; 11) + (1/2, 0, 1/2); (2; 8; 9) + (1/2, 1/2, 0) |
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Maximal isomorphic subgroups of lowest index
IIc | [27] F23 (a' = 3a, b' = 3b, c' = 3c) (196) |
Minimal non-isomorphic supergroups
I | [2] Fm-3 (202); [2] Fd-3 (203); [2] F432 (209); [2] F4132 (210); [2] F-43m (216); [2] F-43c (219) |
II | [2] P23 (a' = 1/2c, b' = 1/2b, c' = 1/2c) (195) |