|
Axes |
Coordinates |
Wyckoff positions |
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4a |
8b |
8c |
8d |
16e |
| I Maximal translationengleiche subgroups |
| [2] Cm11 (8) |
a, b, (1/2)(-b + c) |
x, y + z, 2z |
2a |
4b |
2 × 2a |
4b |
2 × 4b |
![[conventional setting]](/graphics/sg/Wconv.gif) C1m1 |
b, a, (1/2)(-b - c) |
y - z, x, -2z |
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| [2] C1m1 (8) |
a, b, (1/2)(-a + c) |
x + z, y, 2z |
2a |
4b |
4b |
2 × 2a |
2 × 4b |
| [2] A112 (5) |
(1/2)(a - b), b, c |
2x, x + y, z |
2a |
2 × 2b |
4c |
4c |
2 × 4c |
| II Maximal klassengleiche subgroups |
| Loss of centring translations |
| [2] Aea2 (41) |
|
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4a |
8b |
8b |
8b |
2 × 8b |
| [2] Bbe2 (41) |
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4a |
8b |
8b |
8b |
2 × 8b |
| Aea2 |
b, -a, c |
y, -x, z |
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| [2] Ama2 (40) |
|
x + (1/4), y + (1/4), z |
4b |
2 × 4a |
2 × 4b |
8c |
2 × 8c |
| [2] Bbm2 (40) |
|
x + (1/4), y + (1/4), z |
4b |
2 × 4a |
8c |
2 × 4b |
2 × 8c |
| Ama2 |
b, -a, c |
y + (1/4), -x - (1/4), z |
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| [2] Aem2 (39) |
|
x + (1/4), y + (1/4), z |
4c |
4a; 4b |
8d |
2 × 4c |
2 × 8d |
| [2] Bme2 (39) |
|
x + (1/4), y + (1/4), z |
4c |
4a; 4b |
2 × 4c |
8d |
2 × 8d |
| Aem2 |
b, -a, c |
y + (1/4), -x - (1/4), z |
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| [2] Amm2 (38) |
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2a; 2b |
8f |
4d; 4e |
2 × 4c |
2 × 8f |
| [2] Bmm2 (38) |
|
|
2a; 2b |
8f |
2 × 4c |
4d; 4e |
2 × 8f |
| Amm2 |
b, -a, c |
y, -x, z |
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| [2] Ccc2 (37) |
|
x + (1/4), y + (1/4), z |
4c |
4a; 4b |
8d |
8d |
2 × 8d |
| [2] Cmc21 (36) |
|
x, y + (1/4), z |
4a |
8b |
2 × 4a |
8b |
2 × 8b |
| [2] Ccm21 (36) |
|
x + (1/4), y, z |
4a |
8b |
8b |
2 × 4a |
2 × 8b |
| Cmc21 |
b, -a, c |
y, -x - (1/4), z |
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| [2] Cmm2 (35) |
|
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2a; 2b |
2 × 4c |
2 × 4e |
2 × 4d |
2 × 8f |
| Enlarged unit cell, isomorphic |
| [3] Fmm2 |
3a, b, c |
(1/3)x, y, z; ±((1/3), 0, 0) |
4a; 8d |
8b; 16e |
8c; 16e |
3 × 8d |
3 × 16e |
| [p] Fmm2 |
pa, b, c |
(1/p)x, y, z; +((u/p), 0, 0) |
4a; ((p - 1)/2) × 8d |
8b; ((p - 1)/2) × 16e |
8c; ((p - 1)/2) × 16e |
p × 8d |
p × 16e |
|
p = prime > 2; u = 1, . . ., p - 1 |
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| [3] Fmm2 |
a, 3b, c |
x, (1/3)y, z; ±(0, (1/3), 0) |
4a; 8c |
8b; 16e |
3 × 8c |
8d; 16e |
3 × 16e |
| [p] Fmm2 |
a, pb, c |
x, (1/p)y, z; +(0, (u/p), 0) |
4a; ((p - 1)/2) × 8c |
8b; ((p - 1)/2) × 16e |
p × 8c |
8d; ((p - 1)/2) × 16e |
p × 16e |
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p = prime > 2; u = 1, . . ., p - 1 |
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| [3] Fmm2 |
a, b, 3c |
x, y, (1/3)z; ±(0, 0, (1/3)) |
3 × 4a |
3 × 8b |
3 × 8c |
3 × 8d |
3 × 16e |
| [p] Fmm2 |
a, b, pc |
x, y, (1/p)z; +(0, 0, (u/p)) |
p × 4a |
p × 8b |
p × 8c |
p × 8d |
p × 16e |
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p = prime > 2; u = 1, . . ., p - 1 |
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