Origin at centre (2/m) at 2/maa
Asymmetric unit |
0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; 0 ≤ z |
(1) 1 |
(2) 2 x, 0, 0 |
(3) 2 1/4, 0, z |
(4) 2 1/4, y, 0 |
(5) -1 0, 0, 0 |
(6) m 0, y, z |
(7) a x, y, 0 |
(8) a x, 0, z |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); (2); (3); (5)
Multiplicity, Wyckoff letter,
Site symmetry |
Coordinates |
Reflection conditions |
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General:
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(1) x, y, z |
(2) x, -y, -z |
(3) -x + 1/2, -y, z |
(4) -x + 1/2, y, -z |
(5) -x, -y, -z |
(6) -x, y, z |
(7) x + 1/2, y, -z |
(8) x + 1/2, -y, z |
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hk: h = 2n
h0: h = 2n
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Special: no extra conditions |
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0, y, z |
0, -y, -z |
1/2, -y, z |
1/2, y, -z |
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x, 1/2, 0 |
-x + 1/2, 1/2, 0 |
-x, 1/2, 0 |
x + 1/2, 1/2, 0 |
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x, 0, 0 |
-x + 1/2, 0, 0 |
-x, 0, 0 |
x + 1/2, 0, 0 |
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1/4, 1/2, z |
1/4, 1/2, -z |
3/4, 1/2, -z |
3/4, 1/2, z |
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1/4, 0, z |
1/4, 0, -z |
3/4, 0, -z |
3/4, 0, z |
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1/4, y, 0 |
1/4, -y, 0 |
3/4, -y, 0 |
3/4, y, 0 |
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Symmetry of special projections
Along [001] p2mm
a' = 1/2a b' = b
Origin at 0, 0, z |
Along [100] 2mm
a' = b
Origin at x, 0, 0 |
Along [010] 2mm
a' = 1/2a
Origin at 0, y, 0 |
Maximal non-isotypic subgroups
I |
[2] pm2a (31) |
1; 4; 6; 7 |
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[2] p2aa (pb2b, 30) |
1; 2; 7; 8 |
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[2] pma2 (24) |
1; 3; 6; 8 |
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[2] p222 (19) |
1; 2; 3; 4 |
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[2] p12/a1 (p2/b11, 16) |
1; 4; 5; 8 |
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[2] p2/m11 (14) |
1; 2; 5; 6 |
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[2] p112/a (7) |
1; 3; 5; 7 |
IIb |
[2] pbaa (b' = 2b) (43); [2] pman (b' = 2b) (42); [2] pban (b' = 2b) (39) |
Maximal isotypic subgroups of lowest index
IIc |
[2] pmaa (b' = 2b) (38); [3] pmaa (a' = 3a) (38) |
Minimal non-isotypic supergroups
II |
[2] cmme (48); [2] pmmm (b' = 1/2b) (37) |