Origin at 3 2
Asymmetric unit | 0 ≤ x ≤ 2/3; 0 ≤ y ≤ 2/3; 0 ≤ z ≤ 1/6; x ≤ (1 + y)/2; y ≤ min(1 - x, (1 + x)/2) |
Vertices | 0, 0, 0 | 1/2, 0, 0 | 2/3, 1/3, 0 | 1/3, 2/3, 0 | 0, 1/2, 0 | 0, 0, 1/6 | 1/2, 0, 1/6 | 2/3, 1/3, 1/6 | 1/3, 2/3, 1/6 | 0, 1/2, 1/6 |
|
For (0, 0, 0)+ set
(1) 1 | (2) 3+ 0, 0, z | (3) 3- 0, 0, z |
(4) 2 x, x, 0 | (5) 2 x, 0, 0 | (6) 2 0, y, 0 |
For (2/3, 1/3, 1/3)+ set
(1) t(2/3, 1/3, 1/3) | (2) 3+(0, 0, 1/3) 1/3, 1/3, z | (3) 3-(0, 0, 1/3) 1/3, 0, z |
(4) 2(1/2, 1/2, 0) x, x - 1/6, 1/6 | (5) 2(1/2, 0, 0) x, 1/6, 1/6 | (6) 2 1/3, y, 1/6 |
For (1/3, 2/3, 2/3)+ set
(1) t(1/3, 2/3, 2/3) | (2) 3+(0, 0, 2/3) 0, 1/3, z | (3) 3-(0, 0, 2/3) 1/3, 1/3, z |
(4) 2(1/2, 1/2, 0) x, x + 1/6, 1/3 | (5) 2 x, 1/3, 1/3 | (6) 2(0, 1/2, 0) 1/6, y, 1/3 |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); t(2/3, 1/3, 1/3); (2); (4)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
| (0, 0, 0)+ (2/3, 1/3, 1/3)+ (1/3, 2/3, 2/3)+ | General:
|
| (1) x, y, z | (2) -y, x - y, z | (3) -x + y, -x, z | (4) y, x, -z | (5) x - y, -y, -z | (6) -x, -x + y, -z |
| hkil : -h + k + l = 3n hki0 : -h + k = 3n hh(-2h)l : l = 3n h-h0l : h + l = 3n 000l : l = 3n h-h00 : h = 3n
|
| | Special: as above, plus
|
| x, 0, 1/2 | 0, x, 1/2 | -x, -x, 1/2 |
| no extra conditions |
| x, 0, 0 | 0, x, 0 | -x, -x, 0 |
| no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
Symmetry of special projections
Along [001] p3m1 a' = 1/3(2a + b) b' = 1/3(-a + b) Origin at 0, 0, z | Along [100] p2 a' = 1/2(a + 2b) b' = 1/3(-a - 2b + c) Origin at x, 0, 0 | Along [210] p11m a' = 1/2b b' = 1/3c Origin at x, 1/2x, 0 |
Maximal non-isomorphic subgroups
I | | [2] R31 (R3, 146) | (1; 2; 3)+ |
| | [3] R12 (C2, 5) | (1; 4)+ | | [3] R12 (C2, 5) | (1; 5)+ | | [3] R12 (C2, 5) | (1; 6)+ |
|
IIa | | [3] P3221 (154) | 1; 4; (2; 6) + (1/3, 2/3, 2/3); (3; 5) + (2/3, 1/3, 1/3) | | [3] P3221 (154) | 1; 5; (2; 4) + (1/3, 2/3, 2/3); (3; 6) + (2/3, 1/3, 1/3) | | [3] P3221 (154) | 1; 6; (2; 5) + (1/3, 2/3, 2/3); (3; 4) + (2/3, 1/3, 1/3) |
|
| | [3] P3121 (152) | 1; 4; (2; 6) + (2/3, 1/3, 1/3); (3; 5) + (1/3, 2/3, 2/3) | | [3] P3121 (152) | 1; 5; (2; 4) + (2/3, 1/3, 1/3); (3; 6) + (1/3, 2/3, 2/3) | | [3] P3121 (152) | 1; 6; (2; 5) + (2/3, 1/3, 1/3); (3; 4) + (1/3, 2/3, 2/3) |
|
| | [3] P321 (150) | 1; 2; 3; 4; 5; 6 | | [3] P321 (150) | 1; 2; 3; (4; 5; 6) + (1/3, 2/3, 2/3) | | [3] P321 (150) | 1; 2; 3; (4; 5; 6) + (2/3, 1/3, 1/3) |
|
Maximal isomorphic subgroups of lowest index
IIc | [2] R32 (a' = -a, b' = -b, c' = 2c) (155); [4] R32 (a' = -2a, b' = -2b) (155) |
Minimal non-isomorphic supergroups
I | [2] R-3m (166); [2] R-3c (167); [4] P432 (207); [4] P4232 (208); [4] F432 (209); [4] F4132 (210); [4] I432 (211); [4] P4332 (212); [4] P4132 (213); [4] I4132 (214) |
II | [3] P312 (a' = 1/3(2a + b), b' = 1/3(-a + b), c' = 1/3c) (149) |
Origin at 3 2
Asymmetric unit | 0 ≤ x ≤ 1; 0 ≤ y ≤ 1; 0 ≤ z ≤ 1/2; z ≤ min(x, y, 1 - x, 1 - y) |
Vertices | 0, 0, 0 | 1, 0, 0 | 1, 1, 0 | 0, 1, 0 | 1/2, 1/2, 1/2 |
|
(1) 1 | (2) 3+ x, x, x | (3) 3- x, x, x |
(4) 2 -x, 0, x | (5) 2 x, -x, 0 | (6) 2 0, y, -y |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2); (4)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
| | General:
|
| (1) x, y, z | (2) z, x, y | (3) y, z, x | (4) -z, -y, -x | (5) -y, -x, -z | (6) -x, -z, -y |
| no conditions |
| | Special: as above, plus
|
| 1/2, y, -y | -y, 1/2, y | y, -y, 1/2 |
| no extra conditions |
| 0, y, -y | -y, 0, y | y, -y, 0 |
| no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
Symmetry of special projections
Along [111] p3m1 a' = 1/3(2a - b - c) b' = 1/3(-a + 2b - c) Origin at x, x, x | Along [1-10] p2 a' = 1/2(a + b - 2c) b' = c Origin at x, -x, 0 | Along [2-1-1] p11m a' = 1/2(b - c) b' = 1/3(a + b + c) Origin at 2x, -x, -x |
Maximal non-isomorphic subgroups
I | | [2] R31 (R3, 146) | 1; 2; 3 |
| | [3] R12 (C2, 5) | 1; 4 | | [3] R12 (C2, 5) | 1; 5 | | [3] R12 (C2, 5) | 1; 6 |
|
IIb | [3] P321 (a' = a - b, b' = b - c, c' = a + b + c) (150); [3] P3121 (a' = a - b, b' = b - c, c' = a + b + c) (152); [3] P3221 (a' = a - b, b' = b - c, c' = a + b + c) (154) |
Maximal isomorphic subgroups of lowest index
IIc | [2] R32 (a' = b + c, b' = a + c, c' = a + b) (155); [4] R32 (a' = -a + b + c, b' = a - b + c, c' = a + b - c) (155) |
Minimal non-isomorphic supergroups
I | [2] R-3m (166); [2] R-3c (167); [4] P432 (207); [4] P4232 (208); [4] F432 (209); [4] F4132 (210); [4] I432 (211); [4] P4332 (212); [4] P4132 (213); [4] I4132 (214) |
II | [3] P312 (a' = 1/3(2a - b - c), b' = 1/3(-a + 2b - c), c' = 1/3(a + b + c)) (149) |