Origin at -42m
Asymmetric unit |
0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; x ≤ y |
(1) 1 |
(2) 2 0, 0, z |
(3) -4+ 0, 0, z; 0, 0, 0 |
(4) -4- 0, 0, z; 0, 0, 0 |
(5) 2 0, y, 0 |
(6) 2 x, 0, 0 |
(7) m x, -x, z |
(8) m x, x, 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) y, -x, -z |
(4) -y, x, -z |
(5) -x, y, -z |
(6) x, -y, -z |
(7) -y, -x, z |
(8) y, x, z |
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no conditions |
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Special: |
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x, x, z |
-x, -x, z |
x, -x, -z |
-x, x, -z |
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no extra conditions |
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0, 1/2, z |
1/2, 0, -z |
0, 1/2, -z |
1/2, 0, z |
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hk: h + k = 2n
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x, 1/2, 0 |
-x, 1/2, 0 |
1/2, -x, 0 |
1/2, x, 0 |
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no extra conditions |
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x, 0, 0 |
-x, 0, 0 |
0, -x, 0 |
0, x, 0 |
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no extra conditions |
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no extra conditions |
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no extra conditions |
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hk: h + k = 2n
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no extra conditions |
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no extra conditions |
Symmetry of special projections
Along [001] p4mm
a' = a b' = b
Origin at 0, 0, z |
Along [100] 2mm
a' = b
Origin at x, 0, 0 |
Along [110] 1m1
a' = 1/2(-a + b)
Origin at x, x, 0 |
Maximal non-isotypic subgroups
I |
[2] p-411 (p-4, 50) |
1; 2; 3; 4 |
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[2] p21m (cmm2, 26) |
1; 2; 7; 8 |
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[2] p221 (p222, 19) |
1; 2; 5; 6 |
IIb |
[2] c-42d (a' = 2a, b' = 2b) (p-4b2, 60); [2] c-42m (a' = 2a, b' = 2b) (p-4m2, 59) |
Maximal isotypic subgroups of lowest index
IIc |
[9] p-42m (a' = 3a, b' = 3b) (57) |
Minimal non-isotypic supergroups
I |
[2] p4/mmm (61); [2] p4/nbm (62) |