Pba2 jpeg

International Tables for Crystalfography (2006). Vol. A, Space group 32, pp. 232-233.

Pba 2

No. 32

c

'—2v

Pba2

Orthorhombic

Patterson symmetry Pmmm

, *r	Pc2a
,i | -
♦ —

i

i

-+-

i

i

i

-+-

i

i

* i ♦

h-

♦

i

-+— ♦-

P2cb

t t

+o_*o

o*	O*
*o	Ó

o

o

o

I J \

Origin on 112

Asymmetric unit 0<^<ś; 0<y<£; 0<z<l Symmetry operations

(1)1    (2)2 0,0,z    (3) a x,lz    (4)b \,y,z

CONTINUED

No. 32

Pbal

Generatora selected (1); t(l,0,0); *(0,1,0); *(0,0,1); (2); (3)

Positions
Multiplicity, Wyckoff letter, Site symmetry		Coordinates
4 c 1	(i) x,y,ż	&)x,y,z (3) -t + i.y+l.z

2 b    ..2    0,*,z    ±,0,z

2 a    ..2    0,0,z    g, ^ ,z

Symmetry of special projections

Along [001] p2gg a' = a b = (i Origin at0,0,z

Along [100] p 1 m 1 a' = jb b' = c Origin at x, 0,0

Reflection conditions General:

(4) x+ {,y+ {,z    0kl : k=2n

hOl: h = 2n hOO: h = 2n 0kQ: k = 2n

Special: as above, plus hkl : h + k = 2n hkl : h + k^z 2n

Along [010] pi lm a' = c b' = fa Origin at 0,y,0

Maximal non-isomorphic subgroups

I    [2]Plal(Pc,7)    1;    3

[2] PM 1 (Pc, 7)    1;    4

[2]PI 12(P2, 3)    1;    2

Ha    nonę

Ilb    [2] Pnn2 (c' = 2c) (34); [2] Pna2_{ (c' = 2c) (33); [2] Pbn2_t (c' = 2e) (Pna 2,, 33)

Maximal isomorphic subgroups of lowest index

He [2] Pba2(c' = 2c) (32); [3]Pba2(a' = 3aor b' = 3b)(32)

Minimal non-isomorphic supergroups

I [2] Pban(50); [2] Pcca (54); [21 Pbam (55); [2] P4bm (100); [2] P4₂bc (106); [2] P4b2 (117)

H    [2] Cmm2 (35); [2] Aea2 (41); [2] Bbe2 (Aea2,41); [2] lba2 (45); [2] Pbm2 (a' = ja) (Pmo2,28); [2] Pma2 (b' = £b) (28)

233