Pc jpeg

International Tablas for Crystaltagraphy (2006). VoL A, Space group 7, pp, 136-143.

Pc    C?

No. 7    Piel

UNIQUE AXIS b, CELL CHOICE 1

m    Monoclinic

Patterson sym metry P12/m 1

■o_ _o

Origin on glide piane c

Asymmetric unit 0 < jc < 1; 0<y<j; 0<z<l Symmetry operations (D 1    (2) c x,0,z

Generatoraselected (1); ((1,0,0); ((0,t,0); ((0,0,1); (2)

Positions

Multiplicity.    Coordinates    Refiection conditions

Wyckoff letter,

Sile symmetry    General:

2 a 1    (1) Je,y,Z (2)x,y,2+!    hOl : l=2n

00?: l = 2n

Symmetry of special projections

Along (001) p 11 m    Ałong [100] p Ig 1    Along [010] p 1

a¹ = a_f b' = b    a’ = b b' = C_p    a’ = )c b' = a

Origin at0,0,z    Origin atjc,0,0    0riginat0,y,0

Maximal non-Lsomorphic subgroups I [2] PI (1)    1

Ua nonę

nb [2]Ciel (a' = 2a,b' = 2b)(Cc,9)

Maximal Isomorphic subgroups of lowest index

He    [2] P1 c 1 fb’ = 2b) (Pc, 7); [2] P1 c 1 (a' = 2a or a’ = 2a, c’ = 2a + c) (Pc, 7)

Minimal non-isomorphic supergroups

I [2] P2/c (13); [2] P2,/c(I4); [2] Pmc2, (26); [2] Pcc2 (27); [2] Pma2 (28); [2] Pca2, (29); [2) Pnc2 (30); [2] Pmn2, (31);

(2)Pia2(32); (2J Pna2, (33); [2] Pnn2(34); [2]Aem2 (39); (2]Aca2(41)

U    [2] C1 c 1 (Cc. 9); [2] A1 m 1 (Cm, 8); [2] /1 c 1 (Cc. 9); {2] P1 m 1 (c' = )c) (Pm, 6)