[script p]-42c -42m Tetragonal
No. 38 [script p]-42c Patterson symmetry [script p]4/mmm
FIRST SETTING

symmetry group diagram

Origin at -41c

Asymmetric unit 0 ≤ x; 0 ≤ y; 0 ≤ z ≤ 1/2

Symmetry operations

(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, 1/4(6)  2   x, 0, 1/4(7)  c   x, -x, z(8)  c   x, x, z

Generators selected (1); t(0, 0, 1); (2); (3); (5)

Positions

Multiplicity, Wyckoff letter,
Site symmetry		 Coordinates Reflection conditions
 General:
8 f 1
(1) x, y, z(2) -x, -y, z(3) y, -x, -z(4) -y, x, -z
(5) -x, y, -z + 1/2(6) x, -y, -z + 1/2(7) -y, -x, z + 1/2(8) y, x, z + 1/2
l: l = 2n
  Special: no extra conditions
4 e  2 . . 
0, 0, z0, 0, -z0, 0, -z + 1/20, 0, z + 1/2
4 d  . 2 . 
0, y, 1/40, -y, 1/4y, 0, 3/4-y, 0, 3/4
4 c  . 2 . 
x, 0, 1/4-x, 0, 1/40, -x, 3/40, x, 3/4
2 b  -4 . . 
0, 0, 00, 0, 1/2
2 a  2 22 . 
0, 0, 1/40, 0, 3/4

Symmetry of special projections

Along [001]   4mm

Origin at 0, 0, z 		Along [100]   [script p]2mm
a' = c   
Origin at x, 0, 1/4 		Along [110]   [script p]11m
a' = 1/2c   
Origin at x, x, 0

Maximal non-isotypic non-enantiomorphic subgroups

I[2] [script p]-411 ([script p]-4, 27)1; 2; 3; 4
 [2] [script p]21c ([script p]cc2, 16)1; 2; 7; 8
 [2] [script p]221 ([script p]222, 13)1; 2; 5; 6
IIa none
IIbnone

Maximal isotypic subgroups and enantiomorphic subgroups of lowest index

IIc[3] [script p]-42c (c' = 3c) (38)

Minimal non-isotypic non-enantiomorphic supergroups

I[2] [script p]4/mcc (40); [2] [script p]42/mmc (41)
II[2] [script p]-42m (c' = 1/2c) (37)








































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