|
Axes |
Coordinates |
Wyckoff positions |
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2a |
4b |
6c |
12d |
| I Maximal translationengleiche subgroups |
| [2] P6 (168) |
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2 × 1a |
2 × 2b |
2 × 3c |
2 × 6d |
| [2] P31c (159) |
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2a |
2 × 2b |
6c |
2 × 6c |
| [2] P3c1 (158) |
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2a |
2b; 2c |
6d |
2 × 6d |
| [3] Ccc2 (37) |
a, a + 2b, c |
x - (1/2)y, (1/2)y, z |
4a |
8d |
4b; 2 × 4c |
3 × 8d |
| conjugate: |
b, -2a - b, c |
-(1/2)x + y, -(1/2)x, z |
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| conjugate: |
-a - b, a - b, c |
-(1/2)(x + y), (1/2)(x - y), z |
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| alternative: |
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| Ccc2 |
2a + b, b, c |
(1/2)x, -(1/2)x + y, z |
4a |
8d |
4b; 2 × 4c |
3 × 8d |
| or |
a + 2b, -a, c |
(1/2)y, -x + (1/2)y, z |
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| or |
a - b, a + b, c |
(1/2)(x - y), (1/2)(x + y), z |
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| II Maximal klassengleiche subgroups |
| Enlarged unit cell, isomorphic |
| [3] P6cc |
a, b, 3c |
x, y, (1/3)z; ±(0, 0, (1/3)) |
3 × 2a |
3 × 4b |
3 × 6c |
3 × 12d |
| [p] P6cc |
a, b, pc |
x, y, (1/p)z; +(0, 0, (u/p)) |
p × 2a |
p × 4b |
p × 6c |
p × 12d |
|
p = prime > 2; u = 1, . . ., p - 1 |
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| [3] P6cc |
2a + b, -a + b, c |
(1/3)(x + y), (1/3)(-x + 2y), z; |
2a; 4b |
12d |
6c; 12d |
3 × 12d |
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±((1/3), (2/3), 0) |
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| [4] P6cc |
2a, 2b, c |
(1/2)x, (1/2)y, z; +((1/2), 0, 0); |
2a; 6c |
4b; 12d |
2 × 12d |
4 × 12d |
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+(0, (1/2), 0); +((1/2), (1/2), 0) |
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| [p2] P6cc |
pa, pb, c |
(1/p)x, (1/p)y, z; +((u/p), (v/p), 0) |
2a; ((p2 - 1)/6) × 12d |
4b; ((p2 - 1)/3) × 12d |
6c; ((p2 - 1)/2) × 12d |
p2 × 12d |
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p = prime > 4; u, v = 1, . . ., p - 1 |
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