Origin at centre (4/m) at 4/m121/g
Asymmetric unit |
0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; y ≤ 1/2 - x; 0 ≤ z |
(1) 1 |
(2) 2 0, 0, z |
(3) 4+ 0, 0, z |
(4) 4- 0, 0, z |
(5) 2(0, 1/2, 0) 1/4, y, 0 |
(6) 2(1/2, 0, 0) x, 1/4, 0 |
(7) 2(1/2, 1/2, 0) x, x, 0 |
(8) 2 x, -x +1/2, 0 |
(9) -1 0, 0, 0 |
(10) m x, y, 0 |
(11) -4+ 0, 0, z; 0, 0, 0 |
(12) -4- 0, 0, z; 0, 0, 0 |
(13) a x, 1/4, z |
(14) b 1/4, y, z |
(15) m x +1/2, -x, z |
(16) g(1/2, 1/2, 0) x, x, z |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); (2); (3); (5); (9)
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 + 1/2, y + 1/2, -z |
(6) x + 1/2, -y + 1/2, -z |
(7) y + 1/2, x + 1/2, -z |
(8) -y + 1/2, -x + 1/2, -z |
(9) -x, -y, -z |
(10) x, y, -z |
(11) y, -x, -z |
(12) -y, x, -z |
(13) x + 1/2, -y + 1/2, z |
(14) -x + 1/2, y + 1/2, z |
(15) -y + 1/2, -x + 1/2, z |
(16) y + 1/2, x + 1/2, z |
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h0: h = 2n
0k: k = 2n
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Special: as above, plus |
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x, x + 1/2, z |
-x, -x + 1/2, z |
-x + 1/2, x, z |
x + 1/2, -x, z |
-x + 1/2, x, -z |
x + 1/2, -x, -z |
x, x + 1/2, -z |
-x, -x + 1/2, -z |
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no extra conditions |
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x, y, 0 |
-x, -y, 0 |
-y, x, 0 |
y, -x, 0 |
-x + 1/2, y + 1/2, 0 |
x + 1/2, -y + 1/2, 0 |
y + 1/2, x + 1/2, 0 |
-y + 1/2, -x + 1/2, 0 |
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no extra conditions |
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x, x + 1/2, 0 |
-x, -x + 1/2, 0 |
-x + 1/2, x, 0 |
x + 1/2, -x, 0 |
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no extra conditions |
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0, 1/2, z |
1/2, 0, z |
1/2, 0, -z |
0, 1/2, -z |
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hk: h + k = 2n
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0, 0, z |
1/2, 1/2, -z |
0, 0, -z |
1/2, 1/2, z |
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hk: h + k = 2n
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hk: h + k = 2n
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hk: h + k = 2n
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Symmetry of special projections
Along [001] p4gm
a' = a b' = b
Origin at 0, 0, z |
Along [100] 2mm
a' = 1/2b
Origin at x, 0, 0 |
Along [110] 2mm
a' = 1/2(-a + b)
Origin at x, x, 0 |
Maximal non-isotypic subgroups
I |
[2] p-4b2 (60) |
1; 2; 7; 8; 11; 12; 13; 14 |
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[2] p-421m (58) |
1; 2; 5; 6; 11; 12; 15; 16 |
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[2] p4bm (56) |
1; 2; 3; 4; 13; 14; 15; 16 |
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[2] p4212 (54) |
1; 2; 3; 4; 5; 6; 7; 8 |
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[2] p4/m11 (p4/m, 51) |
1; 2; 3; 4; 9; 10; 11; 12 |
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[2] p2/m12/m (cmmm, 47) |
1; 2; 7; 8; 9; 10; 15; 16 |
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[2] p2/m21/b1 (pbam, 44) |
1; 2; 5; 6; 9; 10; 13; 14 |
Maximal isotypic subgroups of lowest index
IIc |
[9] p4/mbm (a' = 3a, b' = 3b) (63) |
Minimal non-isotypic supergroups
II |
[2] c4/mmm (p4/mmm, 61) |